7.2 ipu_device.c分析（二）---具体函数分析
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1. deinterlace_3_field函数
static bool deinterlace_3_field(struct ipu_task_entry *t) { return ((t->set.mode & VDI_MODE) && (t->input.deinterlace.motion != HIGH_MOTION)); } 2. tiled_filed_size函数
u32 field_size; static u32 tiled_filed_size(struct ipu_task_entry *t) { /* note: page_align is required by VPU hw ouput buffer */ field_size = TILED_NV12_FRAME_SIZE(t->input.width, t->input.height/2); return field_size; }3. MODE模式
关于这个VDOA模式，在下面这个task_set结构体里面的注释有说明：VDOA_MODE意味着这个task任务使用vdoa,并且VDOA有两种模式：BANDMODE和non-bandMODE模式。non-bandMODE模式将要转化数据到内存中。而BANDMODE模式需要IPU硬件的同步信号，这种模式是连上VDIC的默认模式。
先来看这个task_set结构体：
struct task_set { #define<span style="color:#FF0000;">NULL_MODE</span>0x0 #define<span style="color:#FF0000;">IC_MODE</span>0x1 #define<span style="color:#FF0000;">ROT_MODE</span>0x2 #define<span style="color:#FF0000;">VDI_MODE</span>0x4 #define <span style="color:#FF0000;">IPU_PREPROCESS_MODE_MASK</span>(IC_MODE | ROT_MODE | VDI_MODE) /* VDOA_MODE means this task use vdoa, and VDOA has two modes: * BAND MODE and non-BAND MODE. Non-band mode will do transfer data * to memory. BAND mode needs hareware sync with IPU, it is used default * if connected to VDIC. */ #define<span style="color:#FF0000;">VDOA_MODE</span>0x8 #define<span style="color:#FF0000;">VDOA_BAND_MODE</span>0x10 u8mode; 。。。。。。。。。struct stripe_setting sp_setting; };上面红色字体是有关MODE模式的变量，可以看到IC_MODE,ROT_MODE,VDA_MODE分别占用u8的一位：
下面就来看下面三个函数：
3.1 only_ic函数
static bool only_ic(u8 mode) { mode = mode & IPU_PREPROCESS_MODE_MASK; return ((mode == IC_MODE) || (mode == VDI_MODE)); } 可以看出来，如果mode占用的如下红色字体所示的任意一位的话，都可以认为是only_ic模式。
3.2 only_rot函数
static bool only_rot(u8 mode) { mode = mode & IPU_PREPROCESS_MODE_MASK; return (mode == ROT_MODE); } 这个only_rot模式，则只有mode占用ROT位的话，才能够认为是only_rot。
3.3ic_and_rot函数
static bool ic_and_rot(u8 mode) { mode = mode & IPU_PREPROCESS_MODE_MASK; return ((mode == (IC_MODE | ROT_MODE)) || (mode == (VDI_MODE | ROT_MODE))); }这种模式如下所示：
4.need_split函数
static bool need_split(struct ipu_task_entry *t) { return ((t->set.split_mode != NO_SPLIT) || (t->task_no & SPLIT_MASK)); } struct task_set { 。。。。。。。。。。#define NO_SPLIT0x0 #define RL_SPLIT0x1 #define UD_SPLIT0x2 #define LEFT_STRIPE0x1 #define RIGHT_STRIPE0x2 #define UP_STRIPE0x4 #define DOWN_STRIPE0x8 #define SPLIT_MASK0xF u8split_mode;。。。。。。。。。struct stripe_setting sp_setting; };这个函数判断的同样是ipu_task_entry结构体中的task_set里面的split_mode，如果这一位不等于0的话，就返回true。这个函数的意思应该是判断一个结构体是否需要拆分，do_task，get_res_do_task，ipu_task_thread，ipu_queue_task函数中都调用了这个函数。
5.fmt_to_bpp函数
unsigned int fmt_to_bpp(unsigned int pixelformat) { u32 bpp; switch (pixelformat) { case IPU_PIX_FMT_RGB565: /*interleaved 422*/ case IPU_PIX_FMT_YUYV: case IPU_PIX_FMT_UYVY: /*non-interleaved 422*/ case IPU_PIX_FMT_YUV422P: case IPU_PIX_FMT_YVU422P: bpp = 16; break; case IPU_PIX_FMT_BGR24: case IPU_PIX_FMT_RGB24: case IPU_PIX_FMT_YUV444: case IPU_PIX_FMT_YUV444P: bpp = 24; break; case IPU_PIX_FMT_BGR32: case IPU_PIX_FMT_BGRA32: case IPU_PIX_FMT_RGB32: case IPU_PIX_FMT_RGBA32: case IPU_PIX_FMT_ABGR32: bpp = 32; break; /*non-interleaved 420*/ case IPU_PIX_FMT_YUV420P: case IPU_PIX_FMT_YVU420P: case IPU_PIX_FMT_YUV420P2: case IPU_PIX_FMT_NV12: bpp = 12; break; default: bpp = 8; break; } return bpp; } EXPORT_SYMBOL_GPL(fmt_to_bpp);这个函数就很简单了，它根据pixelformat格式返回它所占用的bit数，bitsper pixel。
6.colorspaceofpixel函数
cs_t colorspaceofpixel(int fmt) { switch (fmt) { case IPU_PIX_FMT_RGB565: case IPU_PIX_FMT_RGB666: case IPU_PIX_FMT_BGR24: case IPU_PIX_FMT_RGB24: case IPU_PIX_FMT_BGRA32: case IPU_PIX_FMT_BGR32: case IPU_PIX_FMT_RGBA32: case IPU_PIX_FMT_RGB32: case IPU_PIX_FMT_ABGR32: return RGB_CS; break; case IPU_PIX_FMT_UYVY: case IPU_PIX_FMT_YUYV: case IPU_PIX_FMT_YUV420P2: case IPU_PIX_FMT_YUV420P: case IPU_PIX_FMT_YVU420P: case IPU_PIX_FMT_YVU422P: case IPU_PIX_FMT_YUV422P: case IPU_PIX_FMT_YUV444: case IPU_PIX_FMT_YUV444P: case IPU_PIX_FMT_NV12: case IPU_PIX_FMT_TILED_NV12: case IPU_PIX_FMT_TILED_NV12F: return YUV_CS; break; default: return NULL_CS; } } EXPORT_SYMBOL_GPL(colorspaceofpixel);这个函数根据format的值返回这个format的颜色空间colorspace。颜色空间在ipu.h中定义：
typedef enum { RGB_CS, YUV_CS, NULL_CS } cs_t;这个函数主要用在下面要介绍的need_csc函数。
7.need_csc函数
int need_csc(int ifmt, int ofmt) { cs_t ics, ocs; ics = colorspaceofpixel(ifmt); ocs = colorspaceofpixel(ofmt); if ((ics == NULL_CS) || (ocs == NULL_CS)) return -1; else if (ics != ocs) return 1; return 0; } EXPORT_SYMBOL_GPL(need_csc);这个函数通过colorspaceofpixel函数分别获取输入format和输出format的颜色空间，如果两者相同的话，就不需要csc转化了，如果不同的话就需要csc转化。这个函数在check_task中调用。
8.soc_max_in_width函数
static int soc_max_in_width(u32 is_vdoa) { return is_vdoa ? 8192 : 4096; }这个函数返回soc最大的宽度，如果传入的参数为1的话，就返回8192，否则返回4096。这个函数在check_task函数中就是直接这样用的。参数为1的话代表是vdoa。
9.soc_max_vdi_in_width函数
static int soc_max_vdi_in_width(struct ipu_soc *ipu) { int i; if (!ipu) { for (i = 0; i < max_ipu_no; i++) { ipu = ipu_get_soc(i); if (!IS_ERR_OR_NULL(ipu)) break; } if (i == max_ipu_no) return 720; } return IPU_MAX_VDI_IN_WIDTH(ipu->devtype); }#define IPU_MAX_VDI_IN_WIDTH(type)({ (type) >= IPUv3M ? 968 : 720; })这个函数根据传入的ipu_soc结构体里面的devtype来返回vdi的最大宽度。
在ipu_common.c中的ipu_probe函数里面，以下代码是摘取出来的：（在ipu_common.c中详细分析）
const struct of_device_id *of_id = of_match_device(imx_ipuv3_dt_ids, &pdev->dev);const struct ipu_platform_type *iputype = of_id->data; const struct ipu_devtype *devtype = &iputype->devtype;ipu = &ipu_array[id];ipu->devtype = devtype->type;
最终ipu->devtype就调用到imx_ipuv3_dt_ids[x]里面的data数据段：
static const struct of_device_id imx_ipuv3_dt_ids[] = { { .compatible = "fsl,imx51-ipu", .data = &ipu_type_imx51, }, { .compatible = "fsl,imx53-ipu", .data = &ipu_type_imx53, }, { .compatible = "fsl,imx6q-ipu", .data = &ipu_type_imx6q, }, { .compatible = "fsl,imx6qp-ipu", .data = &ipu_type_imx6qp, }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(of, imx_ipuv3_dt_ids);以ipu_type_imx6qp为例，如下所示：
static struct ipu_platform_type ipu_type_imx6qp = { <span style="color:#FF0000;">.devtype = { .name = "IPUv3H", .cm_ofs =0x00200000, .idmac_ofs =0x00208000, .ic_ofs =0x00220000, .csi0_ofs =0x00230000, .csi1_ofs =0x00238000, .di0_ofs =0x00240000, .di1_ofs =0x00248000, .smfc_ofs =0x00250000, .dc_ofs =0x00258000, .dmfc_ofs =0x00260000, .vdi_ofs =0x00268000, .cpmem_ofs =0x00300000, .srm_ofs =0x00340000, .tpm_ofs =0x00360000, .dc_tmpl_ofs =0x00380000, .type =IPUv3H, .idmac_used_bufs_present = true, },</span> .ch0123_axi = 0, .ch23_axi = 0, .ch27_axi = 2, .ch28_axi = 3, .normal_axi = 1, .idmac_used_bufs_en_r = true, .idmac_used_bufs_en_w = true, .idmac_used_bufs_max_r = 0x3, .idmac_used_bufs_max_w = 0x3, .smfc_idmac_12bit_3planar_bs_fixup = true, };这个soc_max_vdi_in_width函数就会比对ipu->devtype即上面标红的部分，将它于IPUv3M比较，大于就返回968，否则返回720。可以查看ipu_common.c中可以看出来ipu_type_imx51为"IPUv3EX"，ipu_type_imx53为"IPUv3M"，ipu_type_imx6q为"IPUv3H"，ipu_type_imx6qp为"IPUv3H"，所以对于imx51和imx53返回720，imx6q和imx6qp返回968。
这个函数在本文件中的update_split_setting，check_task，get_res_do_task函数中调用。
10.soc_max_in_height函数
static int soc_max_in_height(void) { return 4096; }11.soc_max_out_width函数
static int soc_max_out_width(void) { /* mx51/mx53/mx6q is 1024*/ return 1024; }12.soc_max_out_height函数
static int soc_max_out_height(void) { /* mx51/mx53/mx6q is 1024*/ return 1024; }13.dump_task_info函数
static void dump_task_info(struct ipu_task_entry *t) { if (!debug) return; dev_dbg(t->dev, "[0x%p]input:\n", (void *)t); dev_dbg(t->dev, "[0x%p]\tformat = 0x%x\n", (void *)t, t->input.format); dev_dbg(t->dev, "[0x%p]\twidth = %d\n", (void *)t, t->input.width); dev_dbg(t->dev, "[0x%p]\theight = %d\n", (void *)t, t->input.height); dev_dbg(t->dev, "[0x%p]\tcrop.w = %d\n", (void *)t, t->input.crop.w); dev_dbg(t->dev, "[0x%p]\tcrop.h = %d\n", (void *)t, t->input.crop.h); dev_dbg(t->dev, "[0x%p]\tcrop.pos.x = %d\n", (void *)t, t->input.crop.pos.x); dev_dbg(t->dev, "[0x%p]\tcrop.pos.y = %d\n", (void *)t, t->input.crop.pos.y); /*打印ipu_task_entry->input的信息。*/
dev_dbg(t->dev, "[0x%p]input buffer:\n", (void *)t); dev_dbg(t->dev, "[0x%p]\tpaddr = 0x%x\n", (void *)t, t->input.paddr); dev_dbg(t->dev, "[0x%p]\ti_off = 0x%x\n", (void *)t, t->set.i_off); dev_dbg(t->dev, "[0x%p]\ti_uoff = 0x%x\n", (void *)t, t->set.i_uoff); dev_dbg(t->dev, "[0x%p]\ti_voff = 0x%x\n", (void *)t, t->set.i_voff); dev_dbg(t->dev, "[0x%p]\tistride = %d\n", (void *)t, t->set.istride); if (t->input.deinterlace.enable) { dev_dbg(t->dev, "[0x%p]deinterlace enabled with:\n", (void *)t); if (t->input.deinterlace.motion != HIGH_MOTION) { dev_dbg(t->dev, "[0x%p]\tlow/medium motion\n", (void *)t); dev_dbg(t->dev, "[0x%p]\tpaddr_n = 0x%x\n", (void *)t, t->input.paddr_n); } else dev_dbg(t->dev, "[0x%p]\thigh motion\n", (void *)t); } /*打印ipu_task_entry->inputbuffer的一些信息。*/
dev_dbg(t->dev, "[0x%p]output:\n", (void *)t); dev_dbg(t->dev, "[0x%p]\tformat = 0x%x\n", (void *)t, t->output.format); dev_dbg(t->dev, "[0x%p]\twidth = %d\n", (void *)t, t->output.width); dev_dbg(t->dev, "[0x%p]\theight = %d\n", (void *)t, t->output.height); dev_dbg(t->dev, "[0x%p]\tcrop.w = %d\n", (void *)t, t->output.crop.w); dev_dbg(t->dev, "[0x%p]\tcrop.h = %d\n", (void *)t, t->output.crop.h); dev_dbg(t->dev, "[0x%p]\tcrop.pos.x = %d\n", (void *)t, t->output.crop.pos.x); dev_dbg(t->dev, "[0x%p]\tcrop.pos.y = %d\n", (void *)t, t->output.crop.pos.y); dev_dbg(t->dev, "[0x%p]\trotate = %d\n", (void *)t, t->output.rotate);
/*打印ipu_task_entry->output的信息。*/
dev_dbg(t->dev, "[0x%p]output buffer:\n", (void *)t); dev_dbg(t->dev, "[0x%p]\tpaddr = 0x%x\n", (void *)t, t->output.paddr); dev_dbg(t->dev, "[0x%p]\to_off = 0x%x\n", (void *)t, t->set.o_off); dev_dbg(t->dev, "[0x%p]\to_uoff = 0x%x\n", (void *)t, t->set.o_uoff); dev_dbg(t->dev, "[0x%p]\to_voff = 0x%x\n", (void *)t, t->set.o_voff); dev_dbg(t->dev, "[0x%p]\tostride = %d\n", (void *)t, t->set.ostride);
/*打印ipu_task_entry->outputbuffer的一些信息。*/
if (t->overlay_en) { dev_dbg(t->dev, "[0x%p]overlay:\n", (void *)t); dev_dbg(t->dev, "[0x%p]\tformat = 0x%x\n", (void *)t, t->overlay.format); dev_dbg(t->dev, "[0x%p]\twidth = %d\n", (void *)t, t->overlay.width); dev_dbg(t->dev, "[0x%p]\theight = %d\n", (void *)t, t->overlay.height); dev_dbg(t->dev, "[0x%p]\tcrop.w = %d\n", (void *)t, t->overlay.crop.w); dev_dbg(t->dev, "[0x%p]\tcrop.h = %d\n", (void *)t, t->overlay.crop.h); dev_dbg(t->dev, "[0x%p]\tcrop.pos.x = %d\n", (void *)t, t->overlay.crop.pos.x); dev_dbg(t->dev, "[0x%p]\tcrop.pos.y = %d\n", (void *)t, t->overlay.crop.pos.y); /*如果使能了overlay_en的话，打印overlay的一些信息。*/
dev_dbg(t->dev, "[0x%p]overlay buffer:\n", (void *)t); dev_dbg(t->dev, "[0x%p]\tpaddr = 0x%x\n", (void *)t, t->overlay.paddr); dev_dbg(t->dev, "[0x%p]\tov_off = 0x%x\n", (void *)t, t->set.ov_off); dev_dbg(t->dev, "[0x%p]\tov_uoff = 0x%x\n", (void *)t, t->set.ov_uoff); dev_dbg(t->dev, "[0x%p]\tov_voff = 0x%x\n", (void *)t, t->set.ov_voff); dev_dbg(t->dev, "[0x%p]\tovstride = %d\n", (void *)t, t->set.ovstride);
/*打印overlaybuffer的一些信息。*/
if (t->overlay.alpha.mode == IPU_ALPHA_MODE_LOCAL) { dev_dbg(t->dev, "[0x%p]local alpha enabled with:\n", (void *)t); dev_dbg(t->dev, "[0x%p]\tpaddr = 0x%x\n", (void *)t, t->overlay.alpha.loc_alp_paddr); dev_dbg(t->dev, "[0x%p]\tov_alpha_off = 0x%x\n", (void *)t, t->set.ov_alpha_off); dev_dbg(t->dev, "[0x%p]\tov_alpha_stride = %d\n", (void *)t, t->set.ov_alpha_stride); } else dev_dbg(t->dev, "[0x%p]globle alpha enabled with value 0x%x\n", (void *)t, t->overlay.alpha.gvalue); if (t->overlay.colorkey.enable) dev_dbg(t->dev, "[0x%p]colorkey enabled with value 0x%x\n", (void *)t, t->overlay.colorkey.value); } /*打印alpha通道的一些信息。*/
dev_dbg(t->dev, "[0x%p]want task_id = %d\n", (void *)t, t->task_id); dev_dbg(t->dev, "[0x%p]want task mode is 0x%x\n", (void *)t, t->set.mode); dev_dbg(t->dev, "[0x%p]\tIC_MODE = 0x%x\n", (void *)t, IC_MODE); dev_dbg(t->dev, "[0x%p]\tROT_MODE = 0x%x\n", (void *)t, ROT_MODE); dev_dbg(t->dev, "[0x%p]\tVDI_MODE = 0x%x\n", (void *)t, VDI_MODE); dev_dbg(t->dev, "[0x%p]\tTask_no = 0x%x\n\n\n", (void *)t, t->task_no); }
/*打印这个task的一些信息。*/
这个函数里面就是一些打印信息，可以在合适的地方添加这些打印信息来辅助调试。
14.dump_check_err函数
static void dump_check_err(struct device *dev, int err) { switch (err) { case IPU_CHECK_ERR_INPUT_CROP: dev_err(dev, "input crop setting error\n"); break; case IPU_CHECK_ERR_OUTPUT_CROP: dev_err(dev, "output crop setting error\n"); break; case IPU_CHECK_ERR_OVERLAY_CROP: dev_err(dev, "overlay crop setting error\n"); break; case IPU_CHECK_ERR_INPUT_OVER_LIMIT: dev_err(dev, "input over limitation\n"); break; case IPU_CHECK_ERR_OVERLAY_WITH_VDI: dev_err(dev, "do not support overlay with deinterlace\n"); break; case IPU_CHECK_ERR_OV_OUT_NO_FIT: dev_err(dev, "width/height of overlay and ic output should be same\n"); break; case IPU_CHECK_ERR_PROC_NO_NEED: dev_err(dev, "no ipu processing need\n"); break; case IPU_CHECK_ERR_SPLIT_INPUTW_OVER: dev_err(dev, "split mode input width overflow\n"); break; case IPU_CHECK_ERR_SPLIT_INPUTH_OVER: dev_err(dev, "split mode input height overflow\n"); break; case IPU_CHECK_ERR_SPLIT_OUTPUTW_OVER: dev_err(dev, "split mode output width overflow\n"); break; case IPU_CHECK_ERR_SPLIT_OUTPUTH_OVER: dev_err(dev, "split mode output height overflow\n"); break; case IPU_CHECK_ERR_SPLIT_WITH_ROT: dev_err(dev, "not support split mode with rotation\n"); break; case IPU_CHECK_ERR_W_DOWNSIZE_OVER: dev_err(dev, "horizontal downsizing ratio overflow\n"); break; case IPU_CHECK_ERR_H_DOWNSIZE_OVER: dev_err(dev, "vertical downsizing ratio overflow\n"); break; default: break; } }这个函数在check_task里面调用。在上一个ipu_device.c分析（一）中分析的框架中，
staticstruct file_operations mxc_ipu_fops = {。。。
.unlocked_ioctl= mxc_ipu_ioctl,
};
在这个mxc_ipu_ioctl函数中，它为应用程序提供了这个IPU_CHECK_TASKioctl宏，这个宏的核心是ipu_check_task函数，在这个ipu_check_task函数中调用了check_task函数来检查task是否出错，这个函数会生成各个错误信息，然后就会调用这个dump_check_err函数将错误信息打印出来。同时也会调用dump_check_warn函数来打印警告信息，这个dump_check_warn函数在下面贴出来。
15.dump_check_warn函数
static void dump_check_warn(struct device *dev, int warn) { if (warn & IPU_CHECK_WARN_INPUT_OFFS_NOT8ALIGN) dev_warn(dev, "input u/v offset not 8 align\n"); if (warn & IPU_CHECK_WARN_OUTPUT_OFFS_NOT8ALIGN) dev_warn(dev, "output u/v offset not 8 align\n"); if (warn & IPU_CHECK_WARN_OVERLAY_OFFS_NOT8ALIGN) dev_warn(dev, "overlay u/v offset not 8 align\n"); }16.set_crop函数
static int set_crop(struct ipu_crop *crop, int width, int height, int fmt) { if ((width == 0) || (height == 0)) { pr_err("Invalid param: width=%d, height=%d\n", width, height); return -EINVAL; } if ((IPU_PIX_FMT_TILED_NV12 == fmt) || (IPU_PIX_FMT_TILED_NV12F == fmt)) { if (crop->w || crop->h) { if (((crop->w + crop->pos.x) > width) || ((crop->h + crop->pos.y) > height) || (0 != (crop->w % IPU_PIX_FMT_TILED_NV12_MBALIGN)) || (0 != (crop->h % IPU_PIX_FMT_TILED_NV12_MBALIGN)) || (0 != (crop->pos.x % IPU_PIX_FMT_TILED_NV12_MBALIGN)) || (0 != (crop->pos.y % IPU_PIX_FMT_TILED_NV12_MBALIGN)) ) { pr_err("set_crop error MB align.\n"); return -EINVAL; } } else { crop->pos.x = 0; crop->pos.y = 0; crop->w = width; crop->h = height; if ((0 != (crop->w % IPU_PIX_FMT_TILED_NV12_MBALIGN)) || (0 != (crop->h % IPU_PIX_FMT_TILED_NV12_MBALIGN))) { pr_err("set_crop error w/h MB align.\n"); return -EINVAL; } } } else { if (crop->w || crop->h) { if (((crop->w + crop->pos.x) > (width + 16)) || ((crop->h + crop->pos.y) > height + 16)) { pr_err("set_crop error exceeds width/height.\n"); return -EINVAL; } } else { crop->pos.x = 0; crop->pos.y = 0; crop->w = width; crop->h = height; } crop->w -= crop->w%8; crop->h -= crop->h%8; } if ((crop->w == 0) || (crop->h == 0)) { pr_err("Invalid crop param: crop.w=%d, crop.h=%d\n", crop->w, crop->h); return -EINVAL; } return 0; }这个函数根据传入的width，height和fmt参数设置传入的structipu_crop*crop参数。它在文件中主要是用来设置ipu_task_entry结构体中的ipu_output结构体里面的structipu_crop crop。它在check_task，do_task_vdoa_vdi函数中都有调用。
17.update_offset函数
static void update_offset(unsigned int fmt, unsigned int width, unsigned int height, unsigned int pos_x, unsigned int pos_y, int *off, int *uoff, int *voff, int *stride) { /* NOTE: u v offset should based on start point of off*/ switch (fmt) { case IPU_PIX_FMT_YUV420P2: case IPU_PIX_FMT_YUV420P: *off = pos_y * width + pos_x; *uoff = (width * (height - pos_y) - pos_x) + (width/2) * (pos_y/2) + pos_x/2; /* In case height is odd, round up to even */ *voff = *uoff + (width/2) * ((height+1)/2); break; case IPU_PIX_FMT_YVU420P: *off = pos_y * width + pos_x; *voff = (width * (height - pos_y) - pos_x) + (width/2) * (pos_y/2) + pos_x/2; /* In case height is odd, round up to even */ *uoff = *voff + (width/2) * ((height+1)/2); break; case IPU_PIX_FMT_YVU422P: *off = pos_y * width + pos_x; *voff = (width * (height - pos_y) - pos_x) + (width/2) * pos_y + pos_x/2; *uoff = *voff + (width/2) * height; break; case IPU_PIX_FMT_YUV422P: *off = pos_y * width + pos_x; *uoff = (width * (height - pos_y) - pos_x) + (width/2) * pos_y + pos_x/2; *voff = *uoff + (width/2) * height; break; case IPU_PIX_FMT_YUV444P: *off = pos_y * width + pos_x; *uoff = width * height; *voff = width * height * 2; break; case IPU_PIX_FMT_NV12: *off = pos_y * width + pos_x; *uoff = (width * (height - pos_y) - pos_x) + width * (pos_y/2) + pos_x; break; case IPU_PIX_FMT_TILED_NV12: /* * tiled format, progressive: * assuming that line is aligned with MB height (aligned to 16) * offset = line * stride + (pixel / MB_width) * pixels_in_MB * = line * stride + (pixel / 16) * 256 * = line * stride + pixel * 16 */ *off = pos_y * width + (pos_x << 4); *uoff = ALIGN(width * height, SZ_4K) + (*off >> 1) - *off; break; case IPU_PIX_FMT_TILED_NV12F: /* * tiled format, interlaced: * same as above, only number of pixels in MB is 128, * instead of 256 */ *off = (pos_y >> 1) * width + (pos_x << 3); *uoff = ALIGN(width * height/2, SZ_4K) + (*off >> 1) - *off; break; default: *off = (pos_y * width + pos_x) * fmt_to_bpp(fmt)/8; break; } *stride = width * bytes_per_pixel(fmt); }这个函数根据传入的fmt，width和height参数，计算出来off，uoff，voff和stride参数，直接在这些变量的地址里面进行修改传回去。这个函数主要设置的是ipu_task_entry结构体里面的structtask_set set结构体里面的这些变量：
u32 i_off; u32 i_uoff; u32 i_voff; u32 istride; u32 ov_off; u32 ov_uoff; u32 ov_voff; u32 ovstride; u32 ov_alpha_off; u32 ov_alpha_stride; u32 o_off; u32 o_uoff; u32 o_voff; u32 ostride;
但是这里面的算法并不清楚（只知道off的算法），以及这个uoff和voff分别代表什么意思？这个函数都是和上一个set_crop函数绑定使用的，首先调用set_crop函数设置输入，输出或overlay里面的crop，然后调用这个update_offset函数更新偏移量。
18.update_split_setting函数
static int update_split_setting(struct ipu_task_entry *t, bool vdi_split) { struct stripe_param left_stripe; struct stripe_param right_stripe; struct stripe_param up_stripe; struct stripe_param down_stripe; u32 iw, ih, ow, oh; u32 max_width; int ret; if (t->output.rotate >= IPU_ROTATE_90_RIGHT) return IPU_CHECK_ERR_SPLIT_WITH_ROT; iw = t->input.crop.w; ih = t->input.crop.h; ow = t->output.crop.w; oh = t->output.crop.h; memset(&left_stripe, 0, sizeof(left_stripe)); memset(&right_stripe, 0, sizeof(right_stripe)); memset(&up_stripe, 0, sizeof(up_stripe)); memset(&down_stripe, 0, sizeof(down_stripe)); if (t->set.split_mode & RL_SPLIT) { /* * We do want equal strips: initialize stripes in case * calc_stripes returns before actually doing the calculation */ left_stripe.input_width = iw / 2; left_stripe.output_width = ow / 2; right_stripe.input_column = iw / 2; right_stripe.output_column = ow / 2; if (vdi_split) max_width = soc_max_vdi_in_width(t->ipu); else max_width = soc_max_out_width(); ret = ipu_calc_stripes_sizes(iw, ow, max_width, (((unsigned long long)1) << 32), /* 32bit for fractional*/ 1, /* equal stripes */ t->input.format, t->output.format, &left_stripe, &right_stripe); if (ret < 0) return IPU_CHECK_ERR_W_DOWNSIZE_OVER; else if (ret) dev_dbg(t->dev, "Warn: no:0x%x,calc_stripes ret:%d\n", t->task_no, ret); t->set.sp_setting.iw = left_stripe.input_width; t->set.sp_setting.ow = left_stripe.output_width; t->set.sp_setting.outh_resize_ratio = left_stripe.irr; t->set.sp_setting.i_left_pos = left_stripe.input_column; t->set.sp_setting.o_left_pos = left_stripe.output_column; t->set.sp_setting.i_right_pos = right_stripe.input_column; t->set.sp_setting.o_right_pos = right_stripe.output_column; } else { t->set.sp_setting.iw = iw; t->set.sp_setting.ow = ow; t->set.sp_setting.outh_resize_ratio = 0; t->set.sp_setting.i_left_pos = 0; t->set.sp_setting.o_left_pos = 0; t->set.sp_setting.i_right_pos = 0; t->set.sp_setting.o_right_pos = 0; } if ((t->set.sp_setting.iw + t->set.sp_setting.i_right_pos) > (iw+16)) return IPU_CHECK_ERR_SPLIT_INPUTW_OVER; if (((t->set.sp_setting.ow + t->set.sp_setting.o_right_pos) > ow) || (t->set.sp_setting.ow > soc_max_out_width())) return IPU_CHECK_ERR_SPLIT_OUTPUTW_OVER; if (rounddown(t->set.sp_setting.ow, 8) * 8 <= rounddown(t->set.sp_setting.iw, 8)) return IPU_CHECK_ERR_W_DOWNSIZE_OVER; if (t->set.split_mode & UD_SPLIT) { /* * We do want equal strips: initialize stripes in case * calc_stripes returns before actually doing the calculation */ up_stripe.input_width = ih / 2; up_stripe.output_width = oh / 2; down_stripe.input_column = ih / 2; down_stripe.output_column = oh / 2; ret = ipu_calc_stripes_sizes(ih, oh, soc_max_out_height(), (((unsigned long long)1) << 32), /* 32bit for fractional*/ 0x1 | 0x2, /* equal stripes and vertical */ t->input.format, t->output.format, &up_stripe, &down_stripe); if (ret < 0) return IPU_CHECK_ERR_H_DOWNSIZE_OVER; else if (ret) dev_err(t->dev, "Warn: no:0x%x,calc_stripes ret:%d\n", t->task_no, ret); t->set.sp_setting.ih = up_stripe.input_width; t->set.sp_setting.oh = up_stripe.output_width; t->set.sp_setting.outv_resize_ratio = up_stripe.irr; t->set.sp_setting.i_top_pos = up_stripe.input_column; t->set.sp_setting.o_top_pos = up_stripe.output_column; t->set.sp_setting.i_bottom_pos = down_stripe.input_column; t->set.sp_setting.o_bottom_pos = down_stripe.output_column; } else { t->set.sp_setting.ih = ih; t->set.sp_setting.oh = oh; t->set.sp_setting.outv_resize_ratio = 0; t->set.sp_setting.i_top_pos = 0; t->set.sp_setting.o_top_pos = 0; t->set.sp_setting.i_bottom_pos = 0; t->set.sp_setting.o_bottom_pos = 0; } /* downscale case: enforce limits */ if (((t->set.sp_setting.ih + t->set.sp_setting.i_bottom_pos) > (ih)) && (t->set.sp_setting.ih >= t->set.sp_setting.oh)) return IPU_CHECK_ERR_SPLIT_INPUTH_OVER; /* upscale case: relax limits because ipu_calc_stripes_sizes() may create input stripe that falls just outside of the input window */ else if ((t->set.sp_setting.ih + t->set.sp_setting.i_bottom_pos) > (ih+16)) return IPU_CHECK_ERR_SPLIT_INPUTH_OVER; if (((t->set.sp_setting.oh + t->set.sp_setting.o_bottom_pos) > oh) || (t->set.sp_setting.oh > soc_max_out_height())) return IPU_CHECK_ERR_SPLIT_OUTPUTH_OVER; if (rounddown(t->set.sp_setting.oh, 8) * 8 <= rounddown(t->set.sp_setting.ih, 8)) return IPU_CHECK_ERR_H_DOWNSIZE_OVER; return IPU_CHECK_OK; }这个函数里面调用了ipu_calc_stripes_sizes函数，这个函数在ipu_calc_stripes_sizes.c中定义，但是看不懂这几个函数，ipu_calc_stripes_sizes.c与ipu_ic.c都是有关ic的操作函数。先在这作标记，往下分析。
19.check_task函数
static int check_task(struct ipu_task_entry *t) { int tmp; int ret = IPU_CHECK_OK; int timeout; bool vdi_split = false; int ocw, och; if ((IPU_PIX_FMT_TILED_NV12 == t->overlay.format) || (IPU_PIX_FMT_TILED_NV12F == t->overlay.format) || (IPU_PIX_FMT_TILED_NV12 == t->output.format) || (IPU_PIX_FMT_TILED_NV12F == t->output.format) || ((IPU_PIX_FMT_TILED_NV12F == t->input.format) && !t->input.deinterlace.enable)) { ret = IPU_CHECK_ERR_NOT_SUPPORT; goto done; } /*如果发生上述的情况，就说明发生了不支持的task，返回的错误信息是IPU_CHECK_ERR_NOT_SUPPORT，上述的IPU_PIX_FMT_TILED_NV12和IPU_PIX_FMT_TILED_NV12F是像素格式，它们在ipu.h中定义，同样是fourcc码：
/*two planes -- 12 tiled Y/CbCr 4:2:0 */
#defineIPU_PIX_FMT_TILED_NV12 fourcc('T', 'N', 'V', 'P')
#defineIPU_PIX_FMT_TILED_NV12F fourcc('T', 'N', 'V', 'F')
*/
/* check input */ ret = set_crop(&t->input.crop, t->input.width, t->input.height, t->input.format); if (ret < 0) { ret = IPU_CHECK_ERR_INPUT_CROP; goto done; } else update_offset(t->input.format, t->input.width, t->input.height, t->input.crop.pos.x, t->input.crop.pos.y, &t->set.i_off, &t->set.i_uoff, &t->set.i_voff, &t->set.istride); /*检查输入参数，这两个函数在上面分析了，首先调用set_crop函数根据t->input.width，t->input.height，t->input.format来填充&t->input.crop，然后通过update_offset函数来更新&t->set.i_off，&t->set.i_uoff，&t->set.i_voff和&t->set.istride这些偏移值。*/
/* check output */ ret = set_crop(&t->output.crop, t->output.width, t->output.height, t->output.format); if (ret < 0) { ret = IPU_CHECK_ERR_OUTPUT_CROP; goto done; } else update_offset(t->output.format, t->output.width, t->output.height, t->output.crop.pos.x, t->output.crop.pos.y, &t->set.o_off, &t->set.o_uoff, &t->set.o_voff, &t->set.ostride); /*检查输出参数，首先调用set_crop函数根据t->output.width，t->output.height，t->output.format来填充&t->output.crop，然后通过update_offset函数来更新&t->set.o_off,&t->set.o_uoff, &t->set.o_voff和&t->set.ostride这些偏移值。*/
if (t->output.rotate >= IPU_ROTATE_90_RIGHT) { /* * Cache output width and height and * swap them so that we may check * downsize overflow correctly. */ ocw = t->output.crop.h; och = t->output.crop.w; } else { ocw = t->output.crop.w; och = t->output.crop.h; } /*ipu_task_entry结构体里面的structipu_output有一个rotate参数，它记录了输出的图像是否发生旋转，如果旋转的角度大于90度的话，就调换width和height。这里面的ocw应该是outputcache width，och应该是outputcache height的意思。*/
if (ocw * 8 <= t->input.crop.w) { ret = IPU_CHECK_ERR_W_DOWNSIZE_OVER; goto done; } if (och * 8 <= t->input.crop.h) { ret = IPU_CHECK_ERR_H_DOWNSIZE_OVER; goto done; } /*因为这里面设置的是crop的值，所以它是一个缩放值。从这里可以看出来，它最多能够缩放成原来的1/8，如果比这个比例还小的话，就会报错。*/
if ((IPU_PIX_FMT_TILED_NV12 == t->input.format) || (IPU_PIX_FMT_TILED_NV12F == t->input.format)) { if ((t->input.crop.w > soc_max_in_width(1)) || (t->input.crop.h > soc_max_in_height())) { ret = IPU_CHECK_ERR_INPUT_OVER_LIMIT; goto done; } /* output fmt: NV12 and YUYV, now don't support resize */ if (((IPU_PIX_FMT_NV12 != t->output.format) && (IPU_PIX_FMT_YUYV != t->output.format)) || (t->input.crop.w != t->output.crop.w) || (t->input.crop.h != t->output.crop.h)) { ret = IPU_CHECK_ERR_NOT_SUPPORT; goto done; } } /*再次判断输入输出的参数以及t->input.crop.w和t->input.crop.h等参数。*/
/* check overlay if there is */ if (t->overlay_en) { if (t->input.deinterlace.enable) { ret = IPU_CHECK_ERR_OVERLAY_WITH_VDI; goto done; } /*如果使能了input中的deinterlace的话，再启用overlay就会报错：IPU_CHECK_ERR_OVERLAY_WITH_VDI，从这可以看出来overlay不能和VDI共存。*/
ret = set_crop(&t->overlay.crop, t->overlay.width, t->overlay.height, t->overlay.format); if (ret < 0) { ret = IPU_CHECK_ERR_OVERLAY_CROP; goto done; } else { ocw = t->output.crop.w; och = t->output.crop.h; if (t->output.rotate >= IPU_ROTATE_90_RIGHT) { ocw = t->output.crop.h; och = t->output.crop.w; } if ((t->overlay.crop.w != ocw) || (t->overlay.crop.h != och)) { ret = IPU_CHECK_ERR_OV_OUT_NO_FIT; goto done; } update_offset(t->overlay.format, t->overlay.width, t->overlay.height, t->overlay.crop.pos.x, t->overlay.crop.pos.y, &t->set.ov_off, &t->set.ov_uoff, &t->set.ov_voff, &t->set.ovstride); if (t->overlay.alpha.mode == IPU_ALPHA_MODE_LOCAL) { t->set.ov_alpha_stride = t->overlay.width; t->set.ov_alpha_off = t->overlay.crop.pos.y * t->overlay.width + t->overlay.crop.pos.x; } } } /*与上面检查输入输出类似，在这里检查overlay同样先调用set_crop函数设置&t->overlay.crop里面的值，然后设置ocw和och的值，之后调用update_offset函数更新&t->set.ov_off,&t->set.ov_uoff,&t->set.ov_voff和&t->set.ovstride的偏移值，然后根据t->overlay.alpha.mode的值设置t->set.ov_alpha_stride和t->set.ov_alpha_off的值。*/
/* input overflow? */ if (!((IPU_PIX_FMT_TILED_NV12 == t->input.format) || (IPU_PIX_FMT_TILED_NV12F == t->input.format))) { if ((t->input.crop.w > soc_max_in_width(0)) || (t->input.crop.h > soc_max_in_height())) { ret = IPU_CHECK_ERR_INPUT_OVER_LIMIT; goto done; } } /*检查t->input.crop.w和t->input.crop.h是否合乎规范。*/
/* check task mode */ t->set.mode = NULL_MODE; t->set.split_mode = NO_SPLIT; if (t->output.rotate >= IPU_ROTATE_90_RIGHT) { /*output swap*/ tmp = t->output.crop.w; t->output.crop.w = t->output.crop.h; t->output.crop.h = tmp; } if (t->output.rotate >= IPU_ROTATE_90_RIGHT) t->set.mode |= ROT_MODE; /*如果t->output.rotate>= IPU_ROTATE_90_RIGHT的话，就调换width和height，同时将
t->set.mode中置位成ROT_MODE。*/
/*need resize or CSC?*/ if ((t->input.crop.w != t->output.crop.w) || (t->input.crop.h != t->output.crop.h) || need_csc(t->input.format, t->output.format)) t->set.mode |= IC_MODE;
/*检查输入与输出里面crop参数是否相等，或者输入与输出里面的格式是否相同，如果不相等的话就需要将t->set.mode中置位成IC_MODE，意思是需要ImageConverte。*/
/*need cropping?*/ if ((t->input.crop.w != t->input.width) || (t->input.crop.h != t->input.height) || (t->output.crop.w != t->output.width) || (t->output.crop.h != t->output.height)) t->set.mode |= IC_MODE; /*need flip?*/ if ((t->set.mode == NULL_MODE) && (t->output.rotate > IPU_ROTATE_NONE)) t->set.mode |= IC_MODE; /*need IDMAC do format(same color space)?*/ if ((t->set.mode == NULL_MODE) && (t->input.format != t->output.format)) t->set.mode |= IC_MODE; /*overlay support*/ if (t->overlay_en) t->set.mode |= IC_MODE;
/*对于上面几种情况，都需要将t->set.mode置位成IC_MODE模式。*/
/*deinterlace*/ if (t->input.deinterlace.enable) { t->set.mode &= ~IC_MODE; t->set.mode |= VDI_MODE; } /*如果t->input.deinterlace.enable置位的话，意思是使能了输入数据去交错功能，就需要将t->set.mode中的IC_MODE位清零，同时置位成VDI_MODE模式。*/
if ((IPU_PIX_FMT_TILED_NV12 == t->input.format) || (IPU_PIX_FMT_TILED_NV12F == t->input.format)) { if (t->set.mode & ROT_MODE) { ret = IPU_CHECK_ERR_NOT_SUPPORT; goto done; } t->set.mode |= VDOA_MODE; if (IPU_PIX_FMT_TILED_NV12F == t->input.format) t->set.mode |= VDOA_BAND_MODE; t->set.mode &= ~IC_MODE; } /*如果t->input.format的格式为IPU_PIX_FMT_TILED_NV12或IPU_PIX_FMT_TILED_NV12F的话，根据情况置位或清零t->set.mode中的某些位。*/
if ((t->set.mode & (IC_MODE | VDI_MODE)) && (IPU_PIX_FMT_TILED_NV12F != t->input.format)) { if (t->output.crop.w > soc_max_out_width()) t->set.split_mode |= RL_SPLIT; if (t->output.crop.h > soc_max_out_height()) t->set.split_mode |= UD_SPLIT; if (!t->set.split_mode && (t->set.mode & VDI_MODE) && (t->input.crop.w > soc_max_vdi_in_width(t->ipu))) { t->set.split_mode |= RL_SPLIT; vdi_split = true; } /*根据t->output.crop里面的参数来决定是否拆分图像，这个还是比较好理解的，如果t->output.crop.w大于soc_max_out_width()的最大宽度的话，就需要左右拆分图像，同样，如果t->output.crop.h大于soc_max_out_height()的话，就需要上下拆分图像。*/
if (t->set.split_mode) { if ((t->set.split_mode == RL_SPLIT) || (t->set.split_mode == UD_SPLIT)) timeout = DEF_TIMEOUT_MS * 2 + DEF_DELAY_MS; else timeout = DEF_TIMEOUT_MS * 4 + DEF_DELAY_MS; if (t->timeout < timeout) t->timeout = timeout; /*根据不同的拆分模式来确定超时时间，每种拆分模式需要的时间应该是不同的。*/
ret = update_split_setting(t, vdi_split); if (ret > IPU_CHECK_ERR_MIN) goto done; } }
/*调用update_split_setting函数来更新拆分设置。在这个函数中调用了ipu_calc_stripes_sizes函数，这时候再来看在ipu_calc_stripes_sizes函数的意义，应该就是如果设置了t->set.split_mode中的拆分模式的话（上下拆分还是左右拆分），通过这个函数来重新设置图像的大小等信息，不知道这样理解对不对。*/
if (t->output.rotate >= IPU_ROTATE_90_RIGHT) { /*output swap*/ tmp = t->output.crop.w; t->output.crop.w = t->output.crop.h; t->output.crop.h = tmp; } if (t->set.mode == NULL_MODE) { ret = IPU_CHECK_ERR_PROC_NO_NEED; goto done; } if ((t->set.i_uoff % 8) || (t->set.i_voff % 8)) ret |= IPU_CHECK_WARN_INPUT_OFFS_NOT8ALIGN; if ((t->set.o_uoff % 8) || (t->set.o_voff % 8)) ret |= IPU_CHECK_WARN_OUTPUT_OFFS_NOT8ALIGN; if (t->overlay_en && ((t->set.ov_uoff % 8) || (t->set.ov_voff % 8))) ret |= IPU_CHECK_WARN_OVERLAY_OFFS_NOT8ALIGN; done: /* dump msg */ if (debug) { if (ret > IPU_CHECK_ERR_MIN) dump_check_err(t->dev, ret); else if (ret != IPU_CHECK_OK) dump_check_warn(t->dev, ret); } return ret; }至此，这个check_task函数就简单分析完毕，总结一下：它的核心就是ipu_task_entry结构体，首先通过set_crop函数来设置&t->input.crop里面的参数，然后调用update_offset函数来更新&t->set里面的一些偏移值，然后重复这个操作来设置&t->output.crop的值等等，如果使能了overlay的话，就再重复一遍。然后设置t->set.mode和t->set.split_mode的值。它基本就是完成了这些操作。这个函数在prepare_task和ipu_check_task函数中会调用到。
20.prepare_task函数
static int prepare_task(struct ipu_task_entry *t) { int ret = 0; ret = check_task(t); if (ret > IPU_CHECK_ERR_MIN) return -EINVAL; /*首先调用check_task函数来设置ipu_task_entry中的某些位等。*/
if (t->set.mode & VDI_MODE) { t->task_id = IPU_TASK_ID_VF; t->set.task = VDI_VF; if (t->set.mode & ROT_MODE) t->set.task |= ROT_VF; } /*设置ipu_task_entry中的task_id和set.task。*/
if (VDOA_MODE == t->set.mode) { if (t->set.task != 0) { dev_err(t->dev, "ERR: vdoa only task:0x%x, [0x%p].\n", t->set.task, t); return -EINVAL; } t->set.task |= VDOA_ONLY; } if (VDOA_BAND_MODE & t->set.mode) { /* to save band size: 1<<3 = 8 lines */ t->set.band_lines = 3; } /*如果为VDOA_BAND_MODE模式的话，需要设置t->set.band_lines位为3.*/
dump_task_info(t); return ret; }
可见这个prepare_task函数同样是设置ipu_task_entry结构体中的某些位。这个函数在create_split_child_task，ipu_queue_task中调用。
21.ic_vf_pp_is_busy函数
static uint32_t ic_vf_pp_is_busy(struct ipu_soc *ipu, bool is_vf) { uint32_tstatus; uint32_tstatus_vf; uint32_tstatus_rot; if (is_vf) { status = ipu_channel_status(ipu, MEM_VDI_PRP_VF_MEM); status_vf = ipu_channel_status(ipu, MEM_PRP_VF_MEM); status_rot = ipu_channel_status(ipu, MEM_ROT_VF_MEM); return status || status_vf || status_rot; } else { status = ipu_channel_status(ipu, MEM_PP_MEM); status_rot = ipu_channel_status(ipu, MEM_ROT_PP_MEM); return status || status_rot; } }这个函数就是查看某一个channel是否被使能了，它调用了ipu_common.c中的ipu_channel_status函数，其中任意一个通道使能的话这个函数都会返回1.
22._get_vdoa_ipu_res函数
static int _get_vdoa_ipu_res(struct ipu_task_entry *t) { inti; struct ipu_soc*ipu; u8*used; uint32_tfound_ipu = 0; uint32_tfound_vdoa = 0; struct ipu_channel_tabel*tbl = &ipu_ch_tbl; mutex_lock(&tbl->lock); if (t->set.mode & VDOA_MODE) { if (NULL != t->vdoa_handle) found_vdoa = 1; else { found_vdoa = tbl->vdoa_used ? 0 : 1; if (found_vdoa) { tbl->vdoa_used = 1; vdoa_get_handle(&t->vdoa_handle); } else /* first get vdoa->ipu resource sequence */ goto out; if (t->set.task & VDOA_ONLY) goto out; } } for (i = 0; i < max_ipu_no; i++) { ipu = ipu_get_soc(i); if (IS_ERR(ipu)) dev_err(t->dev, "no:0x%x,found_vdoa:%d, ipu:%d\n", t->task_no, found_vdoa, i); used = &tbl->used[i][IPU_PP_CH_VF]; if (t->set.mode & VDI_MODE) { if (0 == *used) { *used = 1; found_ipu = 1; break; } } else if ((t->set.mode & IC_MODE) || only_rot(t->set.mode)) { if (0 == *used) { t->task_id = IPU_TASK_ID_VF; if (t->set.mode & IC_MODE) t->set.task |= IC_VF; if (t->set.mode & ROT_MODE) t->set.task |= ROT_VF; *used = 1; found_ipu = 1; break; } } else dev_err(t->dev, "no:0x%x,found_vdoa:%d, mode:0x%x\n", t->task_no, found_vdoa, t->set.mode); } if (found_ipu) goto next; for (i = 0; i < max_ipu_no; i++) { ipu = ipu_get_soc(i); if (IS_ERR(ipu)) dev_err(t->dev, "no:0x%x,found_vdoa:%d, ipu:%d\n", t->task_no, found_vdoa, i); if ((t->set.mode & IC_MODE) || only_rot(t->set.mode)) { used = &tbl->used[i][IPU_PP_CH_PP]; if (0 == *used) { t->task_id = IPU_TASK_ID_PP; if (t->set.mode & IC_MODE) t->set.task |= IC_PP; if (t->set.mode & ROT_MODE) t->set.task |= ROT_PP; *used = 1; found_ipu = 1; break; } } } next: if (found_ipu) { t->ipu = ipu; t->ipu_id = i; t->dev = ipu->dev; if (atomic_inc_return(&t->res_get) == 2) dev_err(t->dev, "ERR no:0x%x,found_vdoa:%d,get ipu twice\n", t->task_no, found_vdoa); } out: dev_dbg(t->dev, "%s:no:0x%x,found_vdoa:%d, found_ipu:%d\n", __func__, t->task_no, found_vdoa, found_ipu); mutex_unlock(&tbl->lock); if (t->set.task & VDOA_ONLY) return found_vdoa; else if (t->set.mode & VDOA_MODE) return found_vdoa && found_ipu; else return found_ipu; }在看这个函数的时候，它直接使用了if(NULL != t->vdoa_handle)，这个t->vdoa_handle是在哪初始化的？后来在搜索这个的时候发现，它是在init_tiled_buf函数中通过ret= vdoa_setup(t->vdoa_handle,¶m);函数初始化的。跟踪这个vdoa_setup--->init_tiled_buf--->init_tiled_ch_bufs--->do_task_vdoa_only--->get_res_do_task;
或者vdoa_setup--->init_tiled_buf--->init_tiled_ch_bufs--->init_ic--->do_task--->get_res_do_task；（这两个流程都是后面的函数调用前面的函数）
在这个get_res_do_task函数中，get_vdoa_ipu_res--->_get_vdoa_ipu_res这两个函数是最先执行的。所以在第一次执行_get_vdoa_ipu_res函数的时候，这个t->vdoa_handle还没有通过vdoa_setup函数进行初始化。所以第一次执行这个函数的时候，可能就会走到out:这个标号这里。
然后return到get_vdoa_ipu_res函数中，在get_vdoa_ipu_res函数中通过：
ret= wait_event_timeout(res_waitq, _get_vdoa_ipu_res(t),
msecs_to_jiffies(t->timeout - DEF_DELAY_MS));
等待队列获取到信息。
这的流程后面再分析分析，不清楚～～～
23.put_vdoa_ipu_res函数
这个函数是get_vdoa_ipu_res函数的反函数，就不分析了。
24.get_vdoa_ipu_res
static int get_vdoa_ipu_res(struct ipu_task_entry *t) { intret; uint32_tfound = 0; found = _get_vdoa_ipu_res(t); if (!found) { t->ipu_id = -1; t->ipu = NULL; /* blocking to get resource */ ret = atomic_inc_return(&req_cnt); dev_dbg(t->dev, "wait_res:no:0x%x,req_cnt:%d\n", t->task_no, ret); ret = wait_event_timeout(res_waitq, _get_vdoa_ipu_res(t), msecs_to_jiffies(t->timeout - DEF_DELAY_MS)); if (ret == 0) { dev_err(t->dev, "ERR[0x%p,no-0x%x] wait_res timeout:%dms!\n", t, t->task_no, t->timeout - DEF_DELAY_MS); ret = -ETIMEDOUT; t->state = STATE_RES_TIMEOUT; goto out; } else { if (!(t->set.task & VDOA_ONLY) && (!t->ipu)) dev_err(t->dev, "ERR[no-0x%x] can not get ipu!\n", t->task_no); ret = atomic_read(&req_cnt); if (ret > 0) ret = atomic_dec_return(&req_cnt); else dev_err(t->dev, "ERR[no-0x%x] req_cnt:%d mismatch!\n", t->task_no, ret); dev_dbg(t->dev, "no-0x%x,[0x%p],req_cnt:%d, got_res!\n", t->task_no, t, ret); found = 1; } } out: return found; }这个函数就是首先调用_get_vdoa_ipu_res函数来获取资源，如果没有获取到的话，就在等待队列中等待资源，这个函数的返回值是：如果成功获取到资源，返回1，否则返回0.它被get_res_do_task函数调用。
25.create_task_entry函数
static struct ipu_task_entry *create_task_entry(struct ipu_task *task) { struct ipu_task_entry *tsk; tsk = kzalloc(sizeof(struct ipu_task_entry), GFP_KERNEL); if (!tsk) return ERR_PTR(-ENOMEM); kref_init(&tsk->refcount); tsk->state = -EINVAL; tsk->ipu_id = -1; tsk->dev = ipu_dev; tsk->input = task->input; tsk->output = task->output; tsk->overlay_en = task->overlay_en; if (tsk->overlay_en) tsk->overlay = task->overlay; if (task->timeout > DEF_TIMEOUT_MS) tsk->timeout = task->timeout; else tsk->timeout = DEF_TIMEOUT_MS; return tsk; }这个函数就是根据传入的structipu_task *task参数来从新分配设置一个structipu_task_entry*tsk结构体，将里面的值初始化了。它被create_split_child_task，ipu_check_task和ipu_queue_task函数调用。
26.task_mem_free函数
static void task_mem_free(struct kref *ref) { struct ipu_task_entry *tsk = container_of(ref, struct ipu_task_entry, refcount); kfree(tsk); }根据引用计数，然后调用container_of宏来获取它的容器ipu_task_entry，然后释放掉它的内存。
27.create_split_child_task函数
int create_split_child_task(struct ipu_split_task *sp_task) { int ret = 0; struct ipu_task_entry *tsk; tsk = create_task_entry(&sp_task->task); if (IS_ERR(tsk)) return PTR_ERR(tsk); sp_task->child_task = tsk; tsk->task_no = sp_task->task_no; ret = prepare_task(tsk); if (ret < 0) goto err; tsk->parent = sp_task->parent_task; tsk->set.sp_setting = sp_task->parent_task->set.sp_setting; list_add(&tsk->node, &tsk->parent->split_list); dev_dbg(tsk->dev, "[0x%p] sp_tsk Q list,no-0x%x\n", tsk, tsk->task_no); tsk->state = STATE_QUEUE; CHECK_PERF(&tsk->ts_queue); err: return ret; }这个函数还是比较好理解的，首先通过create_task_entry来根据structipu_split_task *sp_task中的task参数分配设置一个ipu_task_entry*tsk结构体，然后分配的这个*tsk结构体作为子task，而函数的实参structipu_split_task*sp_task是父task，然后调用prepare_task函数设置其他的默认值，然后将&tsk->node加入&tsk->parent->split_list链表中，设置tsk->state为STATE_QUEUE。
28.sp_task_check_done函数
static inline int sp_task_check_done(struct ipu_split_task *sp_task, struct ipu_task_entry *parent, int num, int *idx) { int i; int ret = 0; struct ipu_task_entry *tsk; struct mutex *lock = &parent->split_lock; *idx = -EINVAL; mutex_lock(lock); for (i = 0; i < num; i++) { tsk = sp_task[i].child_task; if (tsk && tsk->split_done) { *idx = i; ret = 1; goto out; } } out: mutex_unlock(lock); return ret; }这个函数从tsk=sp_task[i].child_task;数组中找到已经完成的一项，返回它的下标。它在wait_split_task_complete函数中调用。
29.create_split_task函数
static int create_split_task( int stripe, struct ipu_split_task *sp_task) { struct ipu_task *task = &(sp_task->task); struct ipu_task_entry *t = sp_task->parent_task; int ret; sp_task->task_no |= stripe; task->input = t->input; task->output = t->output; task->overlay_en = t->overlay_en; if (task->overlay_en) task->overlay = t->overlay; task->task_id = t->task_id; if ((t->set.split_mode == RL_SPLIT) || (t->set.split_mode == UD_SPLIT)) task->timeout = t->timeout / 2; else task->timeout = t->timeout / 4; /*设置task中的input,output,overlay,timeout。*/
task->input.crop.w = t->set.sp_setting.iw; task->input.crop.h = t->set.sp_setting.ih; if (task->overlay_en) { task->overlay.crop.w = t->set.sp_setting.ow; task->overlay.crop.h = t->set.sp_setting.oh; } if (t->output.rotate >= IPU_ROTATE_90_RIGHT) { task->output.crop.w = t->set.sp_setting.oh; task->output.crop.h = t->set.sp_setting.ow; t->set.sp_setting.rl_split_line = t->set.sp_setting.o_bottom_pos; t->set.sp_setting.ud_split_line = t->set.sp_setting.o_right_pos; } else { task->output.crop.w = t->set.sp_setting.ow; task->output.crop.h = t->set.sp_setting.oh; t->set.sp_setting.rl_split_line = t->set.sp_setting.o_right_pos; t->set.sp_setting.ud_split_line = t->set.sp_setting.o_bottom_pos; } /*设置task中input,output,overlay里面的crop参数。*/
if (stripe & LEFT_STRIPE) task->input.crop.pos.x += t->set.sp_setting.i_left_pos; else if (stripe & RIGHT_STRIPE) task->input.crop.pos.x += t->set.sp_setting.i_right_pos; if (stripe & UP_STRIPE) task->input.crop.pos.y += t->set.sp_setting.i_top_pos; else if (stripe & DOWN_STRIPE) task->input.crop.pos.y += t->set.sp_setting.i_bottom_pos; if (task->overlay_en) { if (stripe & LEFT_STRIPE) task->overlay.crop.pos.x += t->set.sp_setting.o_left_pos; else if (stripe & RIGHT_STRIPE) task->overlay.crop.pos.x += t->set.sp_setting.o_right_pos; if (stripe & UP_STRIPE) task->overlay.crop.pos.y += t->set.sp_setting.o_top_pos; else if (stripe & DOWN_STRIPE) task->overlay.crop.pos.y += t->set.sp_setting.o_bottom_pos; } switch (t->output.rotate) { case IPU_ROTATE_NONE: if (stripe & LEFT_STRIPE) task->output.crop.pos.x += t->set.sp_setting.o_left_pos; else if (stripe & RIGHT_STRIPE) task->output.crop.pos.x += t->set.sp_setting.o_right_pos; if (stripe & UP_STRIPE) task->output.crop.pos.y += t->set.sp_setting.o_top_pos; else if (stripe & DOWN_STRIPE) task->output.crop.pos.y += t->set.sp_setting.o_bottom_pos; break; case IPU_ROTATE_VERT_FLIP: if (stripe & LEFT_STRIPE) task->output.crop.pos.x += t->set.sp_setting.o_left_pos; else if (stripe & RIGHT_STRIPE) task->output.crop.pos.x += t->set.sp_setting.o_right_pos; if (stripe & UP_STRIPE) task->output.crop.pos.y = t->output.crop.pos.y + t->output.crop.h - t->set.sp_setting.o_top_pos - t->set.sp_setting.oh; else if (stripe & DOWN_STRIPE) task->output.crop.pos.y = t->output.crop.pos.y + t->output.crop.h - t->set.sp_setting.o_bottom_pos - t->set.sp_setting.oh; break; case IPU_ROTATE_HORIZ_FLIP: if (stripe & LEFT_STRIPE) task->output.crop.pos.x = t->output.crop.pos.x + t->output.crop.w - t->set.sp_setting.o_left_pos - t->set.sp_setting.ow; else if (stripe & RIGHT_STRIPE) task->output.crop.pos.x = t->output.crop.pos.x + t->output.crop.w - t->set.sp_setting.o_right_pos - t->set.sp_setting.ow; if (stripe & UP_STRIPE) task->output.crop.pos.y += t->set.sp_setting.o_top_pos; else if (stripe & DOWN_STRIPE) task->output.crop.pos.y += t->set.sp_setting.o_bottom_pos; break; case IPU_ROTATE_180: if (stripe & LEFT_STRIPE) task->output.crop.pos.x = t->output.crop.pos.x + t->output.crop.w - t->set.sp_setting.o_left_pos - t->set.sp_setting.ow; else if (stripe & RIGHT_STRIPE) task->output.crop.pos.x = t->output.crop.pos.x + t->output.crop.w - t->set.sp_setting.o_right_pos - t->set.sp_setting.ow; if (stripe & UP_STRIPE) task->output.crop.pos.y = t->output.crop.pos.y + t->output.crop.h - t->set.sp_setting.o_top_pos - t->set.sp_setting.oh; else if (stripe & DOWN_STRIPE) task->output.crop.pos.y = t->output.crop.pos.y + t->output.crop.h - t->set.sp_setting.o_bottom_pos - t->set.sp_setting.oh; break; case IPU_ROTATE_90_RIGHT: if (stripe & UP_STRIPE) task->output.crop.pos.x = t->output.crop.pos.x + t->output.crop.w - t->set.sp_setting.o_top_pos - t->set.sp_setting.oh; else if (stripe & DOWN_STRIPE) task->output.crop.pos.x = t->output.crop.pos.x + t->output.crop.w - t->set.sp_setting.o_bottom_pos - t->set.sp_setting.oh; if (stripe & LEFT_STRIPE) task->output.crop.pos.y += t->set.sp_setting.o_left_pos; else if (stripe & RIGHT_STRIPE) task->output.crop.pos.y += t->set.sp_setting.o_right_pos; break; case IPU_ROTATE_90_RIGHT_HFLIP: if (stripe & UP_STRIPE) task->output.crop.pos.x += t->set.sp_setting.o_top_pos; else if (stripe & DOWN_STRIPE) task->output.crop.pos.x += t->set.sp_setting.o_bottom_pos; if (stripe & LEFT_STRIPE) task->output.crop.pos.y += t->set.sp_setting.o_left_pos; else if (stripe & RIGHT_STRIPE) task->output.crop.pos.y += t->set.sp_setting.o_right_pos; break; case IPU_ROTATE_90_RIGHT_VFLIP: if (stripe & UP_STRIPE) task->output.crop.pos.x = t->output.crop.pos.x + t->output.crop.w - t->set.sp_setting.o_top_pos - t->set.sp_setting.oh; else if (stripe & DOWN_STRIPE) task->output.crop.pos.x = t->output.crop.pos.x + t->output.crop.w - t->set.sp_setting.o_bottom_pos - t->set.sp_setting.oh; if (stripe & LEFT_STRIPE) task->output.crop.pos.y = t->output.crop.pos.y + t->output.crop.h - t->set.sp_setting.o_left_pos - t->set.sp_setting.ow; else if (stripe & RIGHT_STRIPE) task->output.crop.pos.y = t->output.crop.pos.y + t->output.crop.h - t->set.sp_setting.o_right_pos - t->set.sp_setting.ow; break; case IPU_ROTATE_90_LEFT: if (stripe & UP_STRIPE) task->output.crop.pos.x += t->set.sp_setting.o_top_pos; else if (stripe & DOWN_STRIPE) task->output.crop.pos.x += t->set.sp_setting.o_bottom_pos; if (stripe & LEFT_STRIPE) task->output.crop.pos.y = t->output.crop.pos.y + t->output.crop.h - t->set.sp_setting.o_left_pos - t->set.sp_setting.ow; else if (stripe & RIGHT_STRIPE) task->output.crop.pos.y = t->output.crop.pos.y + t->output.crop.h - t->set.sp_setting.o_right_pos - t->set.sp_setting.ow; break; default: dev_err(t->dev, "ERR:should not be here\n"); break; } /*上面这个switch语句是根据t->output.rotate的值来设置task里面output的crop值。*/
ret = create_split_child_task(sp_task); if (ret < 0) dev_err(t->dev, "ERR:create_split_child_task() ret:%d\n", ret);
/*上面设置好了sp_task中的task参数，就根据它来创建子task。*/
return ret; }
先来看这个structipu_split_task结构体：
struct ipu_split_task { struct ipu_task task; struct ipu_task_entry *parent_task; struct ipu_task_entry *child_task; u32 task_no; };从这个函数的的开头：
structipu_task *task = &(sp_task->task);
structipu_task_entry *t = sp_task->parent_task;
而这个函数的主要操作就是设置这个task结构体。从这里就可以看出来，函数的目的就是根据传入的第二个structipu_split_task *sp_task参数里面的parent_task成员来填充第二个参数里面的task成员。设置完以后，在最后调用create_split_child_task函数（27.中讲解），根据sp_task->task来设置子task。
30.queue_split_task函数
static int queue_split_task(struct ipu_task_entry *t, struct ipu_split_task *sp_task, uint32_t size) { int err[4]; int ret = 0; int i, j; struct ipu_task_entry *tsk = NULL; struct mutex *lock = &t->split_lock; struct mutex *vdic_lock = &t->vdic_lock; dev_dbg(t->dev, "Split task 0x%p, no-0x%x, size:%d\n", t, t->task_no, size); mutex_init(lock); mutex_init(vdic_lock); init_waitqueue_head(&t->split_waitq); INIT_LIST_HEAD(&t->split_list); /*初始化锁，等待队列，链表头等。*/
for (j = 0; j < size; j++) { memset(&sp_task[j], 0, sizeof(*sp_task)); sp_task[j].parent_task = t; sp_task[j].task_no = t->task_no; } /*将&sp_task[j]中的每一项都置为0，然后将每一项的parent_task都指向函数的第一个参数t。*/
if (t->set.split_mode == RL_SPLIT) { i = 0; err[i] = create_split_task(RIGHT_STRIPE, &sp_task[i]); if (err[i] < 0) goto err_start; i = 1; err[i] = create_split_task(LEFT_STRIPE, &sp_task[i]); } else if (t->set.split_mode == UD_SPLIT) { i = 0; err[i] = create_split_task(DOWN_STRIPE, &sp_task[i]); if (err[i] < 0) goto err_start; i = 1; err[i] = create_split_task(UP_STRIPE, &sp_task[i]); } else { i = 0; err[i] = create_split_task(RIGHT_STRIPE | DOWN_STRIPE, &sp_task[i]); if (err[i] < 0) goto err_start; i = 1; err[i] = create_split_task(LEFT_STRIPE | DOWN_STRIPE, &sp_task[i]); if (err[i] < 0) goto err_start; i = 2; err[i] = create_split_task(RIGHT_STRIPE | UP_STRIPE, &sp_task[i]); if (err[i] < 0) goto err_start; i = 3; err[i] = create_split_task(LEFT_STRIPE | UP_STRIPE, &sp_task[i]); } /*以上根据t->set.split_mode来选择创建什么样的子task。以RL_SPLIT为例，它分别创建了sp_task[0]，stripe为RIGHT_STRIPE的子task和sp_task[1]，stripe为LEFT_STRIPE的子task。如果tsk->set.split_mode明确表示等于RL_SPLIT或者UD_SPLIT的话，函数的第三个参数size就等于2,表示将创建2个子task，保存在sp_task数组中;除此之外的其他情况下将会创建4个子task，为什么呢？因为这个tsk->set.split_mode除了明确指明等于RL_SPLIT或者UD_SPLIT的话，第三种情况基本就能确定是RL_SPLIT|UD_SPLIT。*/
err_start: for (j = 0; j < (i + 1); j++) { if (err[j] < 0) { if (sp_task[j].child_task) dev_err(t->dev, "sp_task[%d],no-0x%x fail state:%d, queue err:%d.\n", j, sp_task[j].child_task->task_no, sp_task[j].child_task->state, err[j]); goto err_exit; } dev_dbg(t->dev, "[0x%p] sp_task[%d], no-0x%x state:%s, queue ret:%d.\n", sp_task[j].child_task, j, sp_task[j].child_task->task_no, state_msg[sp_task[j].child_task->state].msg, err[j]); } return ret; err_exit: for (j = 0; j < (i + 1); j++) { if (err[j] < 0 && !ret) ret = err[j]; tsk = sp_task[j].child_task; if (!tsk) continue; kfree(tsk); } t->state = STATE_ERR; return ret; }这个函数直接在ipu_task_thread被调用。
31.init_tiled_buf函数
static int init_tiled_buf(struct ipu_soc *ipu, struct ipu_task_entry *t, ipu_channel_t channel, uint32_t ch_type) { int ret = 0; int i; uint32_t ipu_fmt; dma_addr_t inbuf_base = 0; u32 field_size; struct vdoa_params param; struct vdoa_ipu_buf buf; struct ipu_soc *ipu_idx; u32 ipu_stride, obuf_size; u32 height, width; ipu_buffer_t type; if ((IPU_PIX_FMT_YUYV != t->output.format) && (IPU_PIX_FMT_NV12 != t->output.format)) { dev_err(t->dev, "ERR:[0x%d] output format\n", t->task_no); return -EINVAL; } /*如果t->output.format的格式不是IPU_PIX_FMT_YUYV或IPU_PIX_FMT_NV12的话就报错。*/
memset(¶m, 0, sizeof(param)); /* init channel tiled bufs */ if (deinterlace_3_field(t) && (IPU_PIX_FMT_TILED_NV12F == t->input.format)) { field_size = tiled_filed_size(t); if (INPUT_CHAN_VDI_P == ch_type) { inbuf_base = t->input.paddr + field_size; param.vfield_buf.prev_veba = inbuf_base + t->set.i_off; } else if (INPUT_CHAN == ch_type) { inbuf_base = t->input.paddr_n; param.vfield_buf.cur_veba = inbuf_base + t->set.i_off; } else if (INPUT_CHAN_VDI_N == ch_type) { inbuf_base = t->input.paddr_n + field_size; param.vfield_buf.next_veba = inbuf_base + t->set.i_off; } else return -EINVAL; height = t->input.crop.h >> 1; /* field format for vdoa */ width = t->input.crop.w; param.vfield_buf.vubo = t->set.i_uoff; param.interlaced = 1; param.scan_order = 1; type = IPU_INPUT_BUFFER; } /*如果IPU_PIX_FMT_TILED_NV12F==t->input.format的话就会执行上面的语句。首先根据函数的第四个参数ch_type来确定inbuf_base和param.vfield_buf.cur_veba的值。设置height，width,type和param的值。*/
else if ((IPU_PIX_FMT_TILED_NV12 == t->input.format) && (INPUT_CHAN == ch_type)) { height = t->input.crop.h; width = t->input.crop.w; param.vframe_buf.veba = t->input.paddr + t->set.i_off; param.vframe_buf.vubo = t->set.i_uoff; type = IPU_INPUT_BUFFER; } else return -EINVAL; /*如果IPU_PIX_FMT_TILED_NV12== t->input.format的话就会执行这段代码。设置height，width,type和param的值。*/
param.band_mode = (t->set.mode & VDOA_BAND_MODE) ? 1 : 0; if (param.band_mode && (t->set.band_lines != 3) && (t->set.band_lines != 4) && (t->set.band_lines != 5)) return -EINVAL; else if (param.band_mode) param.band_lines = (1 << t->set.band_lines); for (i = 0; i < max_ipu_no; i++) { ipu_idx = ipu_get_soc(i); if (!IS_ERR(ipu_idx) && ipu_idx == ipu) break; } if (t->set.task & VDOA_ONLY) /* dummy, didn't need ipu res */ i = 0; if (max_ipu_no == i) { dev_err(t->dev, "ERR:[0x%p] get ipu num\n", t); return -EINVAL; } param.ipu_num = i; param.vpu_stride = t->input.width; param.height = height; param.width = width; if (IPU_PIX_FMT_NV12 == t->output.format) param.pfs = VDOA_PFS_NV12; else param.pfs = VDOA_PFS_YUYV; ipu_fmt = (param.pfs == VDOA_PFS_YUYV) ? IPU_PIX_FMT_YUYV : IPU_PIX_FMT_NV12; ipu_stride = param.width * bytes_per_pixel(ipu_fmt); obuf_size = PAGE_ALIGN(param.width * param.height * fmt_to_bpp(ipu_fmt)/8); dev_dbg(t->dev, "band_mode:%d, band_lines:%d\n", param.band_mode, param.band_lines); if (!param.band_mode) { /* note: if only for tiled -> raster convert and no other post-processing, we don't need alloc buf and use output buffer directly. */ if (t->set.task & VDOA_ONLY) param.ieba0 = t->output.paddr; else { dev_err(t->dev, "ERR:[0x%d] vdoa task\n", t->task_no); return -EINVAL; } } else { if (IPU_PIX_FMT_TILED_NV12F != t->input.format) { dev_err(t->dev, "ERR [0x%d] vdoa task\n", t->task_no); return -EINVAL; } } /*上面这些设置主要是设置param的值，最终目的是调用下面的vdoa_setup函数。*/
ret = vdoa_setup(t->vdoa_handle, ¶m); if (ret) goto done; vdoa_get_output_buf(t->vdoa_handle, &buf); if (t->set.task & VDOA_ONLY) goto done;
/*通过上面两个函数分别来设置vdoa和将vdoa中的数据读到buf中，然后为下面这个函数做准备。这两个函数在vdoa.c中，暂时没有分析。*/
ret = ipu_init_channel_buffer(ipu, channel, type, ipu_fmt, width, height, ipu_stride, IPU_ROTATE_NONE, buf.ieba0, buf.ieba1, 0, buf.iubo, 0); if (ret < 0) { t->state = STATE_INIT_CHAN_BUF_FAIL; goto done; } /*然后调用ipu_init_channel_buffer函数来初始化channel的buffer。这个函数在ipu_common.c中。*/
if (param.band_mode) { ret = ipu_set_channel_bandmode(ipu, channel, type, t->set.band_lines); if (ret < 0) { t->state = STATE_INIT_CHAN_BAND_FAIL; goto done; } } /*如果MODE是VDOA_BAND_MODE的话，就会执行这个函数。*/
done: return ret; }
32.init_tiled_ch_bufs函数
static int init_tiled_ch_bufs(struct ipu_soc *ipu, struct ipu_task_entry *t) { int ret = 0; if (IPU_PIX_FMT_TILED_NV12 == t->input.format) { ret = init_tiled_buf(ipu, t, t->set.ic_chan, INPUT_CHAN); CHECK_RETCODE(ret < 0, "init tiled_ch", t->state, done, ret); } /*如果t->input.format== IPU_PIX_FMT_TILED_NV12的话，就根据t->set.ic_chan和INPUT_CHAN初始化一个channel的buffer。*/
else if (IPU_PIX_FMT_TILED_NV12F == t->input.format) { ret = init_tiled_buf(ipu, t, t->set.ic_chan, INPUT_CHAN); CHECK_RETCODE(ret < 0, "init tiled_ch-c", t->state, done, ret); ret = init_tiled_buf(ipu, t, t->set.vdi_ic_p_chan, INPUT_CHAN_VDI_P); CHECK_RETCODE(ret < 0, "init tiled_ch-p", t->state, done, ret); ret = init_tiled_buf(ipu, t, t->set.vdi_ic_n_chan, INPUT_CHAN_VDI_N); CHECK_RETCODE(ret < 0, "init tiled_ch-n", t->state, done, ret); } /*如果t->input.format==IPU_PIX_FMT_TILED_NV12F的话，需要初始化t->set.ic_chan，t->set.vdi_ic_p_chan和t->set.vdi_ic_n_chan三个channel的buffer。看来这个t->input.format很重要啊～～～*/
else { ret = -EINVAL; dev_err(t->dev, "ERR[no-0x%x] invalid fmt:0x%x!\n", t->task_no, t->input.format); } done: return ret; }这个函数是初始化channel的平铺buffer的，所以在init_ic和do_task_vdoa_only函数中调用它。
33.init_ic函数
static int init_ic(struct ipu_soc *ipu, struct ipu_task_entry *t) { int ret = 0; ipu_channel_params_t params; dma_addr_t inbuf = 0, ovbuf = 0, ov_alp_buf = 0; dma_addr_t inbuf_p = 0, inbuf_n = 0; dma_addr_t outbuf = 0; int out_uoff = 0, out_voff = 0, out_rot; int out_w = 0, out_h = 0, out_stride; int out_fmt; u32 vdi_frame_idx = 0; memset(¶ms, 0, sizeof(params)); /* is it need link a rot channel */ if (ic_and_rot(t->set.mode)) { outbuf = t->set.r_paddr; out_w = t->set.r_width; out_h = t->set.r_height; out_stride = t->set.r_stride; out_fmt = t->set.r_fmt; out_uoff = 0; out_voff = 0; out_rot = IPU_ROTATE_NONE; } else { outbuf = t->output.paddr + t->set.o_off; out_w = t->output.crop.w; out_h = t->output.crop.h; out_stride = t->set.ostride; out_fmt = t->output.format; out_uoff = t->set.o_uoff; out_voff = t->set.o_voff; out_rot = t->output.rotate; } /*通过ic_and_rot函数来判断是否需要链接上一个rotchannel，如果需要的话，就将outbuf，out_w，out_h等等值都赋为t->set.r_xxxx的值，不需要的话就赋为t->set.o_xxxx的值。*/
/* settings */ params.mem_prp_vf_mem.in_width = t->input.crop.w; params.mem_prp_vf_mem.out_width = out_w; params.mem_prp_vf_mem.in_height = t->input.crop.h; params.mem_prp_vf_mem.out_height = out_h; params.mem_prp_vf_mem.in_pixel_fmt = t->input.format; params.mem_prp_vf_mem.out_pixel_fmt = out_fmt; params.mem_prp_vf_mem.motion_sel = t->input.deinterlace.motion; params.mem_prp_vf_mem.outh_resize_ratio = t->set.sp_setting.outh_resize_ratio; params.mem_prp_vf_mem.outv_resize_ratio = t->set.sp_setting.outv_resize_ratio; if (t->overlay_en) { params.mem_prp_vf_mem.in_g_pixel_fmt = t->overlay.format; params.mem_prp_vf_mem.graphics_combine_en = 1; if (t->overlay.alpha.mode == IPU_ALPHA_MODE_GLOBAL) params.mem_prp_vf_mem.global_alpha_en = 1; else if (t->overlay.alpha.loc_alp_paddr) params.mem_prp_vf_mem.alpha_chan_en = 1; /* otherwise, alpha bending per pixel is used. */ params.mem_prp_vf_mem.alpha = t->overlay.alpha.gvalue; if (t->overlay.colorkey.enable) { params.mem_prp_vf_mem.key_color_en = 1; params.mem_prp_vf_mem.key_color = t->overlay.colorkey.value; } } if (t->input.deinterlace.enable) { if (t->input.deinterlace.field_fmt & IPU_DEINTERLACE_FIELD_MASK) params.mem_prp_vf_mem.field_fmt = IPU_DEINTERLACE_FIELD_BOTTOM; else params.mem_prp_vf_mem.field_fmt = IPU_DEINTERLACE_FIELD_TOP; if (t->input.deinterlace.field_fmt & IPU_DEINTERLACE_RATE_EN) vdi_frame_idx = t->input.deinterlace.field_fmt & IPU_DEINTERLACE_RATE_FRAME1; } /*以上的代码就是设置ipu_channel_params_tparams的各个值，然后这个params变量将要被ipu_init_channel函数所使用来初始化channel。*/
if (t->set.mode & VDOA_MODE) ipu->vdoa_en = 1; /* init channels */ if (!(t->set.task & VDOA_ONLY)) { ret = ipu_init_channel(ipu, t->set.ic_chan, ¶ms); if (ret < 0) { t->state = STATE_INIT_CHAN_FAIL; goto done; } } /*如果t->set.task不是VDOA_ONLY的话，就根据参数初始化t->set.ic_chan这个channel。为什么不能是VDOA_ONLY呢？因为在get_res_do_task函数中分流了，如果是VDOA_ONLY的话就会调用do_task_vdoa_only函数。*/
if (deinterlace_3_field(t)) { ret = ipu_init_channel(ipu, t->set.vdi_ic_p_chan, ¶ms); if (ret < 0) { t->state = STATE_INIT_CHAN_FAIL; goto done; } ret = ipu_init_channel(ipu, t->set.vdi_ic_n_chan, ¶ms); if (ret < 0) { t->state = STATE_INIT_CHAN_FAIL; goto done; } } /*同时还需要初始化t->set.vdi_ic_p_chan和t->set.vdi_ic_n_chan这两个channel。*/
/* init channel bufs */ if ((IPU_PIX_FMT_TILED_NV12 == t->input.format) || (IPU_PIX_FMT_TILED_NV12F == t->input.format)) { ret = init_tiled_ch_bufs(ipu, t); if (ret < 0) goto done; } /*如果t->input.format为IPU_PIX_FMT_TILED_NV12或IPU_PIX_FMT_TILED_NV12F的话，就调用init_tiled_ch_bufs函数即可。这时候就有点理解了，对于输入的这两种格式，它们不能用普通的buffer来存储，所以这的buffer叫做tiledbuffer，而对于一般的输入格式，就直接调用下面的ipu_init_channel_buffer函数来初始化。看这两个格式的名字里面也带有TILED。*/
else { if ((deinterlace_3_field(t)) && (IPU_PIX_FMT_TILED_NV12F != t->input.format)) { if (params.mem_prp_vf_mem.field_fmt == IPU_DEINTERLACE_FIELD_TOP) { if (vdi_frame_idx) { inbuf_p = t->input.paddr + t->set.istride + t->set.i_off; inbuf = t->input.paddr_n + t->set.i_off; inbuf_n = t->input.paddr_n + t->set.istride + t->set.i_off; params.mem_prp_vf_mem.field_fmt = IPU_DEINTERLACE_FIELD_BOTTOM; } else { inbuf_p = t->input.paddr + t->set.i_off; inbuf = t->input.paddr + t->set.istride + t->set.i_off; inbuf_n = t->input.paddr_n + t->set.i_off; } } else { if (vdi_frame_idx) { inbuf_p = t->input.paddr + t->set.i_off; inbuf = t->input.paddr_n + t->set.istride + t->set.i_off; inbuf_n = t->input.paddr_n + t->set.i_off; params.mem_prp_vf_mem.field_fmt = IPU_DEINTERLACE_FIELD_TOP; } else { inbuf_p = t->input.paddr + t->set.istride + t->set.i_off; inbuf = t->input.paddr + t->set.i_off; inbuf_n = t->input.paddr_n + t->set.istride + t->set.i_off; } } } else { if (t->input.deinterlace.enable) { if (params.mem_prp_vf_mem.field_fmt == IPU_DEINTERLACE_FIELD_TOP) { if (vdi_frame_idx) { inbuf = t->input.paddr + t->set.istride + t->set.i_off; params.mem_prp_vf_mem.field_fmt = IPU_DEINTERLACE_FIELD_BOTTOM; } else inbuf = t->input.paddr + t->set.i_off; } else { if (vdi_frame_idx) { inbuf = t->input.paddr + t->set.i_off; params.mem_prp_vf_mem.field_fmt = IPU_DEINTERLACE_FIELD_TOP; } else inbuf = t->input.paddr + t->set.istride + t->set.i_off; } } else inbuf = t->input.paddr + t->set.i_off; } /*上面就是设置inbuf_p，inbuf和inbuf_n的值。这几个值分别用在不同的ipu_init_channel_buffer函数里面，具体有什么不同以后再分析。*/
if (t->overlay_en) ovbuf = t->overlay.paddr + t->set.ov_off;
/*如果使能了overlay_en的话，设置ovbuf。*/
} if (t->overlay_en && (t->overlay.alpha.mode == IPU_ALPHA_MODE_LOCAL)) ov_alp_buf = t->overlay.alpha.loc_alp_paddr + t->set.ov_alpha_off;
/*如果使能overlay_en同时设置了alpha模式的话，设置ov_alp_buf。*/
if ((IPU_PIX_FMT_TILED_NV12 != t->input.format) && (IPU_PIX_FMT_TILED_NV12F != t->input.format)) { ret = ipu_init_channel_buffer(ipu, t->set.ic_chan, IPU_INPUT_BUFFER, t->input.format, t->input.crop.w, t->input.crop.h, t->set.istride, IPU_ROTATE_NONE, inbuf, 0, 0, t->set.i_uoff, t->set.i_voff); if (ret < 0) { t->state = STATE_INIT_CHAN_BUF_FAIL; goto done; } } /*上面通过ipu_init_channel函数初始化了3个channel，所以需要初始化3个对应的buffer。这里初始化的是t->set.ic_chanchannel的buffer。*/
if (deinterlace_3_field(t) && (IPU_PIX_FMT_TILED_NV12F != t->input.format)) { ret = ipu_init_channel_buffer(ipu, t->set.vdi_ic_p_chan, IPU_INPUT_BUFFER, t->input.format, t->input.crop.w, t->input.crop.h, t->set.istride, IPU_ROTATE_NONE, inbuf_p, 0, 0, t->set.i_uoff, t->set.i_voff); if (ret < 0) { t->state = STATE_INIT_CHAN_BUF_FAIL; goto done; } /*这里初始化的是t->set.vdi_ic_p_chanchannel的buffer。*/
ret = ipu_init_channel_buffer(ipu, t->set.vdi_ic_n_chan, IPU_INPUT_BUFFER, t->input.format, t->input.crop.w, t->input.crop.h, t->set.istride, IPU_ROTATE_NONE, inbuf_n, 0, 0, t->set.i_uoff, t->set.i_voff); if (ret < 0) { t->state = STATE_INIT_CHAN_BUF_FAIL; goto done; } } /*这里初始化的是t->set.vdi_ic_n_chanchannel的buffer。*/
if (t->overlay_en) { ret = ipu_init_channel_buffer(ipu, t->set.ic_chan, IPU_GRAPH_IN_BUFFER, t->overlay.format, t->overlay.crop.w, t->overlay.crop.h, t->set.ovstride, IPU_ROTATE_NONE, ovbuf, 0, 0, t->set.ov_uoff, t->set.ov_voff); if (ret < 0) { t->state = STATE_INIT_CHAN_BUF_FAIL; goto done; } } /*如果使能了overlay_en的话，同样需要为它初始化channelbuffer。*/
if (t->overlay.alpha.mode == IPU_ALPHA_MODE_LOCAL) { ret = ipu_init_channel_buffer(ipu, t->set.ic_chan, IPU_ALPHA_IN_BUFFER, IPU_PIX_FMT_GENERIC, t->overlay.crop.w, t->overlay.crop.h, t->set.ov_alpha_stride, IPU_ROTATE_NONE, ov_alp_buf, 0, 0, 0, 0); if (ret < 0) { t->state = STATE_INIT_CHAN_BUF_FAIL; goto done; } } /*如果t->overlay.alpha.mode== IPU_ALPHA_MODE_LOCAL 的话，需要为它初始化channelbuffer。*/
if (!(t->set.task & VDOA_ONLY)) { ret = ipu_init_channel_buffer(ipu, t->set.ic_chan, IPU_OUTPUT_BUFFER, out_fmt, out_w, out_h, out_stride, out_rot, outbuf, 0, 0, out_uoff, out_voff); if (ret < 0) { t->state = STATE_INIT_CHAN_BUF_FAIL; goto done; } } /*初始化这个channelbuffer是为什么。。。。不理解*/
if ((t->set.mode & VDOA_BAND_MODE) && (t->set.task & VDI_VF)) { ret = ipu_link_channels(ipu, MEM_VDOA_MEM, t->set.ic_chan); CHECK_RETCODE(ret < 0, "ipu_link_ch vdoa_ic", STATE_LINK_CHAN_FAIL, done, ret); } /*链接两个channel。什么情况下需要链接channel？？是因为它们都是t->set.ic_chanchannel吗？？？这个函数在ipu_common.c中。*/
done: return ret; }
34.uninit_ic函数
static void uninit_ic(struct ipu_soc *ipu, struct ipu_task_entry *t) { int ret; if ((t->set.mode & VDOA_BAND_MODE) && (t->set.task & VDI_VF)) { ret = ipu_unlink_channels(ipu, MEM_VDOA_MEM, t->set.ic_chan); CHECK_RETCODE_CONT(ret < 0, "ipu_unlink_ch vdoa_ic", STATE_UNLINK_CHAN_FAIL, ret); } ipu_uninit_channel(ipu, t->set.ic_chan); if (deinterlace_3_field(t)) { ipu_uninit_channel(ipu, t->set.vdi_ic_p_chan); ipu_uninit_channel(ipu, t->set.vdi_ic_n_chan); } }这个函数是上一个函数的反函数，就不分析了。
35.init_rot函数
static int init_rot(struct ipu_soc *ipu, struct ipu_task_entry *t) { int ret = 0; dma_addr_t inbuf = 0, outbuf = 0; int in_uoff = 0, in_voff = 0; int in_fmt, in_width, in_height, in_stride; /* init channel */ ret = ipu_init_channel(ipu, t->set.rot_chan, NULL); if (ret < 0) { t->state = STATE_INIT_CHAN_FAIL; goto done; } /* init channel buf */ /* is it need link to a ic channel */ if (ic_and_rot(t->set.mode)) { in_fmt = t->set.r_fmt; in_width = t->set.r_width; in_height = t->set.r_height; in_stride = t->set.r_stride; inbuf = t->set.r_paddr; in_uoff = 0; in_voff = 0; } else { in_fmt = t->input.format; in_width = t->input.crop.w; in_height = t->input.crop.h; in_stride = t->set.istride; inbuf = t->input.paddr + t->set.i_off; in_uoff = t->set.i_uoff; in_voff = t->set.i_voff; } outbuf = t->output.paddr + t->set.o_off; /*设置一些值用于ipu_init_channel_buffer函数。*/
ret = ipu_init_channel_buffer(ipu, t->set.rot_chan, IPU_INPUT_BUFFER, in_fmt, in_width, in_height, in_stride, t->output.rotate, inbuf, 0, 0, in_uoff, in_voff); if (ret < 0) { t->state = STATE_INIT_CHAN_BUF_FAIL; goto done; } ret = ipu_init_channel_buffer(ipu, t->set.rot_chan, IPU_OUTPUT_BUFFER, t->output.format, t->output.crop.w, t->output.crop.h, t->set.ostride, IPU_ROTATE_NONE, outbuf, 0, 0, t->set.o_uoff, t->set.o_voff); if (ret < 0) { t->state = STATE_INIT_CHAN_BUF_FAIL; goto done; } done: return ret; }这个函数初始化了两个channelbuffer，注释中有一句话：isit need link to a icchannel。但是第二个ipu_init_channel_buffer函数的第三个参数是IPU_OUTPUT_BUFFER，同样在init_ic函数中，它同样多初始化了一个channelbuffer，第三个参数同样是IPU_OUTPUT_BUFFER。所以是不是channel中必须包含输入输出呢？
这个函数被do_task函数所调用。
36.uninit_rot函数
static void uninit_rot(struct ipu_soc *ipu, struct ipu_task_entry *t) { ipu_uninit_channel(ipu, t->set.rot_chan); }上一个函数的反函数，不分析了。
37.get_irq函数
static int get_irq(struct ipu_task_entry *t) { int irq; ipu_channel_t chan; if (only_ic(t->set.mode)) chan = t->set.ic_chan; else chan = t->set.rot_chan; switch (chan) { case MEM_ROT_VF_MEM: irq = IPU_IRQ_PRP_VF_ROT_OUT_EOF; break; case MEM_ROT_PP_MEM: irq = IPU_IRQ_PP_ROT_OUT_EOF; break; case MEM_VDI_PRP_VF_MEM: case MEM_PRP_VF_MEM: irq = IPU_IRQ_PRP_VF_OUT_EOF; break; case MEM_PP_MEM: irq = IPU_IRQ_PP_OUT_EOF; break; case MEM_VDI_MEM: irq = IPU_IRQ_VDIC_OUT_EOF; break; default: irq = -EINVAL; } return irq; }这个函数根据ipu_task_entry->set的channel来确定对应channel的中断号。
38.task_irq_handler函数
static irqreturn_t task_irq_handler(int irq, void *dev_id) { struct ipu_task_entry *prev_tsk = dev_id; CHECK_PERF(&prev_tsk->ts_inirq); complete(&prev_tsk->irq_comp); dev_dbg(prev_tsk->dev, "[0x%p] no-0x%x in-irq!", prev_tsk, prev_tsk->task_no); return IRQ_HANDLED; }看名字基本可以确定它是一个中断函数的处理函数，搜索源码可以找到：
ret= ipu_request_irq(ipu, irq, task_irq_handler, 0, NULL, t);
39.vdi_split_process函数（这个函数只在do_task_release函数中调用了，先不想分析呢。。）
40.do_task_release函数，do_task函数的反函数，先不分析。。。
41.do_task_vdoa_only函数
static void do_task_vdoa_only(struct ipu_task_entry *t) { int ret; ret = init_tiled_ch_bufs(NULL, t); CHECK_RETCODE(ret < 0, "do_vdoa_only", STATE_ERR, out, ret); ret = vdoa_start(t->vdoa_handle, VDOA_DEF_TIMEOUT_MS); vdoa_stop(t->vdoa_handle); CHECK_RETCODE(ret < 0, "vdoa_wait4complete, do_vdoa_only", STATE_VDOA_IRQ_TIMEOUT, out, ret); t->state = STATE_OK; out: return; }这个函数中调用了init_tiled_ch_bufs函数来初始化channelbuffer，就说明t->input.format只能是IPU_PIX_FMT_TILED_NV12或者IPU_PIX_FMT_TILED_NV12F，是不是VDOA就是用来处理这种输入格式的？
然后调用vdoa_start函数，在里面等待完成量，如果返回的话意味着完成量超时????，调用vdoa_stop函数来关闭vdoa。
42.do_task函数
static void do_task(struct ipu_task_entry *t) { int r_size; int irq; int ret; uint32_t busy; struct ipu_soc *ipu = t->ipu; CHECK_PERF(&t->ts_dotask); if (!ipu) { t->state = STATE_NO_IPU; return; } init_completion(&t->irq_comp); //初始化完成量dev_dbg(ipu->dev, "[0x%p]Do task no:0x%x: id %d\n", (void *)t, t->task_no, t->task_id); dump_task_info(t); if (t->set.task & IC_PP) { t->set.ic_chan = MEM_PP_MEM; dev_dbg(ipu->dev, "[0x%p]ic channel MEM_PP_MEM\n", (void *)t); } else if (t->set.task & IC_VF) { t->set.ic_chan = MEM_PRP_VF_MEM; dev_dbg(ipu->dev, "[0x%p]ic channel MEM_PRP_VF_MEM\n", (void *)t); } else if (t->set.task & VDI_VF) { if (t->set.mode & VDOA_BAND_MODE) { t->set.ic_chan = MEM_VDI_MEM; if (deinterlace_3_field(t)) { t->set.vdi_ic_p_chan = MEM_VDI_MEM_P; t->set.vdi_ic_n_chan = MEM_VDI_MEM_N; } dev_dbg(ipu->dev, "[0x%p]ic ch MEM_VDI_MEM\n", (void *)t); } else { t->set.ic_chan = MEM_VDI_PRP_VF_MEM; if (deinterlace_3_field(t)) { t->set.vdi_ic_p_chan = MEM_VDI_PRP_VF_MEM_P; t->set.vdi_ic_n_chan = MEM_VDI_PRP_VF_MEM_N; } dev_dbg(ipu->dev, "[0x%p]ic ch MEM_VDI_PRP_VF_MEM\n", t); } } /*根据t->set.task里面的值设置t->set.ic_chan。在t->set.task是VDI_VF的情况下，还要根据t->set.mode来设置t->set.vdi_ic_p_chan和t->set.vdi_ic_n_chan。*/
/*上面从整体来说是设置ICchannel的。*/
if (t->set.task & ROT_PP) { t->set.rot_chan = MEM_ROT_PP_MEM; dev_dbg(ipu->dev, "[0x%p]rot channel MEM_ROT_PP_MEM\n", (void *)t); } else if (t->set.task & ROT_VF) { t->set.rot_chan = MEM_ROT_VF_MEM; dev_dbg(ipu->dev, "[0x%p]rot channel MEM_ROT_VF_MEM\n", (void *)t); } /*设置t->set.rot_chan，从整体上来说是设置ROTchannel。*/
if (t->task_id == IPU_TASK_ID_VF) busy = ic_vf_pp_is_busy(ipu, true); else if (t->task_id == IPU_TASK_ID_PP) busy = ic_vf_pp_is_busy(ipu, false); else { dev_err(ipu->dev, "ERR[no:0x%x]ipu task_id:%d invalid!\n", t->task_no, t->task_id); return; } if (busy) { dev_err(ipu->dev, "ERR[0x%p-no:0x%x]ipu task_id:%d busy!\n", (void *)t, t->task_no, t->task_id); t->state = STATE_IPU_BUSY; return; } /*判断这两个通道是否正在占用。*/
irq = get_irq(t); if (irq < 0) { t->state = STATE_NO_IRQ; return; } t->irq = irq; /*申请中断，这个get_irq函数是在前面讲过的。申请成功的话将t->irq指向这个irq。*/
/* channel setup */ if (only_ic(t->set.mode)) { dev_dbg(t->dev, "[0x%p]only ic mode\n", (void *)t); ret = init_ic(ipu, t); CHECK_RETCODE(ret < 0, "init_ic only_ic", t->state, chan_setup, ret); } else if (only_rot(t->set.mode)) { dev_dbg(t->dev, "[0x%p]only rot mode\n", (void *)t); ret = init_rot(ipu, t); CHECK_RETCODE(ret < 0, "init_rot only_rot", t->state, chan_setup, ret); } else if (ic_and_rot(t->set.mode)) { int rot_idx = (t->task_id == IPU_TASK_ID_VF) ? 0 : 1; dev_dbg(t->dev, "[0x%p]ic + rot mode\n", (void *)t); t->set.r_fmt = t->output.format; if (t->output.rotate >= IPU_ROTATE_90_RIGHT) { t->set.r_width = t->output.crop.h; t->set.r_height = t->output.crop.w; } else { t->set.r_width = t->output.crop.w; t->set.r_height = t->output.crop.h; } t->set.r_stride = t->set.r_width * bytes_per_pixel(t->set.r_fmt); r_size = PAGE_ALIGN(t->set.r_width * t->set.r_height * fmt_to_bpp(t->set.r_fmt)/8); if (r_size > ipu->rot_dma[rot_idx].size) { dev_dbg(t->dev, "[0x%p]realloc rot buffer\n", (void *)t); if (ipu->rot_dma[rot_idx].vaddr) dma_free_coherent(t->dev, ipu->rot_dma[rot_idx].size, ipu->rot_dma[rot_idx].vaddr, ipu->rot_dma[rot_idx].paddr); ipu->rot_dma[rot_idx].size = r_size; ipu->rot_dma[rot_idx].vaddr = dma_alloc_coherent(t->dev, r_size, &ipu->rot_dma[rot_idx].paddr, GFP_DMA | GFP_KERNEL); CHECK_RETCODE(ipu->rot_dma[rot_idx].vaddr == NULL, "ic_and_rot", STATE_SYS_NO_MEM, chan_setup, -ENOMEM); } t->set.r_paddr = ipu->rot_dma[rot_idx].paddr; dev_dbg(t->dev, "[0x%p]rotation:\n", (void *)t); dev_dbg(t->dev, "[0x%p]\tformat = 0x%x\n", (void *)t, t->set.r_fmt); dev_dbg(t->dev, "[0x%p]\twidth = %d\n", (void *)t, t->set.r_width); dev_dbg(t->dev, "[0x%p]\theight = %d\n", (void *)t, t->set.r_height); dev_dbg(t->dev, "[0x%p]\tpaddr = 0x%x\n", (void *)t, t->set.r_paddr); dev_dbg(t->dev, "[0x%p]\trstride = %d\n", (void *)t, t->set.r_stride); ret = init_ic(ipu, t); CHECK_RETCODE(ret < 0, "init_ic ic_and_rot", t->state, chan_setup, ret); ret = init_rot(ipu, t); CHECK_RETCODE(ret < 0, "init_rot ic_and_rot", t->state, chan_setup, ret); ret = ipu_link_channels(ipu, t->set.ic_chan, t->set.rot_chan); CHECK_RETCODE(ret < 0, "ipu_link_ch ic_and_rot", STATE_LINK_CHAN_FAIL, chan_setup, ret); } else { dev_err(t->dev, "ERR [0x%p]do task: should not be here\n", t); t->state = STATE_ERR; return; } /*上面这一段代码就是根据t->set.mode来决定执行哪个mode模式：如果只是ICMODE模式的话，就调用init_ic函数即可，如果只是ROTMODE的话，就只调用init_rot函数即可。如果是ic_and_rot模式的话，就需要同时调用这两个函数，同时还需要调用ipu_link_channels函数将两个channel链接起来。*/
ret = ipu_request_irq(ipu, irq, task_irq_handler, 0, NULL, t); CHECK_RETCODE(ret < 0, "ipu_req_irq", STATE_IRQ_FAIL, chan_setup, ret);
/*调用ipu_request_irq函数来为ipu申请中断，中断函数为task_irq_handler。这个ipu_request_irq函数在ipu_common.c中定义。*/
/* enable/start channel */ if (only_ic(t->set.mode)) { ret = ipu_enable_channel(ipu, t->set.ic_chan); CHECK_RETCODE(ret < 0, "ipu_enable_ch only_ic", STATE_ENABLE_CHAN_FAIL, chan_en, ret); if (deinterlace_3_field(t)) { ret = ipu_enable_channel(ipu, t->set.vdi_ic_p_chan); CHECK_RETCODE(ret < 0, "ipu_enable_ch only_ic_p", STATE_ENABLE_CHAN_FAIL, chan_en, ret); ret = ipu_enable_channel(ipu, t->set.vdi_ic_n_chan); CHECK_RETCODE(ret < 0, "ipu_enable_ch only_ic_n", STATE_ENABLE_CHAN_FAIL, chan_en, ret); } ret = ipu_select_buffer(ipu, t->set.ic_chan, IPU_OUTPUT_BUFFER, 0); CHECK_RETCODE(ret < 0, "ipu_sel_buf only_ic", STATE_SEL_BUF_FAIL, chan_buf, ret); if (t->overlay_en) { ret = ipu_select_buffer(ipu, t->set.ic_chan, IPU_GRAPH_IN_BUFFER, 0); CHECK_RETCODE(ret < 0, "ipu_sel_buf only_ic_g", STATE_SEL_BUF_FAIL, chan_buf, ret); if (t->overlay.alpha.mode == IPU_ALPHA_MODE_LOCAL) { ret = ipu_select_buffer(ipu, t->set.ic_chan, IPU_ALPHA_IN_BUFFER, 0); CHECK_RETCODE(ret < 0, "ipu_sel_buf only_ic_a", STATE_SEL_BUF_FAIL, chan_buf, ret); } } if (!(t->set.mode & VDOA_BAND_MODE)) { if (deinterlace_3_field(t)) ipu_select_multi_vdi_buffer(ipu, 0); else { ret = ipu_select_buffer(ipu, t->set.ic_chan, IPU_INPUT_BUFFER, 0); CHECK_RETCODE(ret < 0, "ipu_sel_buf only_ic_i", STATE_SEL_BUF_FAIL, chan_buf, ret); } } } /*使能/开启channel，同样分为3种情况，根据t->set.mode来判断，如果是only_ic模式，（1）就调用ipu_enable_channel函数来使能t->set.ic_chanchannel，然后如果有需要的话同时使能t->set.vdi_ic_p_chanchannel和t->set.vdi_ic_n_chanchannel。（2）调用ipu_select_buffer函数来为t->set.ic_chanchannel选择IPU_OUTPUT_BUFFERbuffer。如果使能ovverlay的话，还需要为t->set.ic_chanchannel选择IPU_GRAPH_IN_BUFFERbuffer；如果启用了alpha通道的话，也需要为t->set.ic_chanchannel选择IPU_ALPHA_IN_BUFFERbuffer。*/
else if (only_rot(t->set.mode)) { ret = ipu_enable_channel(ipu, t->set.rot_chan); CHECK_RETCODE(ret < 0, "ipu_enable_ch only_rot", STATE_ENABLE_CHAN_FAIL, chan_en, ret); ret = ipu_select_buffer(ipu, t->set.rot_chan, IPU_OUTPUT_BUFFER, 0); CHECK_RETCODE(ret < 0, "ipu_sel_buf only_rot_o", STATE_SEL_BUF_FAIL, chan_buf, ret); ret = ipu_select_buffer(ipu, t->set.rot_chan, IPU_INPUT_BUFFER, 0); CHECK_RETCODE(ret < 0, "ipu_sel_buf only_rot_i", STATE_SEL_BUF_FAIL, chan_buf, ret); } /*如果是only_rot模式，调用ipu_enable_channel函数使能t->set.rot_chan通道，还需要为t->set.rot_chanchannel选择对应的buffer，这个channel需要同时选择IPU_OUTPUT_BUFFER和IPU_INPUT_BUFFER两个buffer。*/
else if (ic_and_rot(t->set.mode)) { ret = ipu_enable_channel(ipu, t->set.rot_chan); CHECK_RETCODE(ret < 0, "ipu_enable_ch ic_and_rot-rot", STATE_ENABLE_CHAN_FAIL, chan_en, ret); ret = ipu_enable_channel(ipu, t->set.ic_chan); CHECK_RETCODE(ret < 0, "ipu_enable_ch ic_and_rot-ic", STATE_ENABLE_CHAN_FAIL, chan_en, ret); if (deinterlace_3_field(t)) { ret = ipu_enable_channel(ipu, t->set.vdi_ic_p_chan); CHECK_RETCODE(ret < 0, "ipu_enable_ch ic_and_rot-p", STATE_ENABLE_CHAN_FAIL, chan_en, ret); ret = ipu_enable_channel(ipu, t->set.vdi_ic_n_chan); CHECK_RETCODE(ret < 0, "ipu_enable_ch ic_and_rot-n", STATE_ENABLE_CHAN_FAIL, chan_en, ret); } ret = ipu_select_buffer(ipu, t->set.rot_chan, IPU_OUTPUT_BUFFER, 0); CHECK_RETCODE(ret < 0, "ipu_sel_buf ic_and_rot-rot-o", STATE_SEL_BUF_FAIL, chan_buf, ret); if (t->overlay_en) { ret = ipu_select_buffer(ipu, t->set.ic_chan, IPU_GRAPH_IN_BUFFER, 0); CHECK_RETCODE(ret < 0, "ipu_sel_buf ic_and_rot-ic-g", STATE_SEL_BUF_FAIL, chan_buf, ret); if (t->overlay.alpha.mode == IPU_ALPHA_MODE_LOCAL) { ret = ipu_select_buffer(ipu, t->set.ic_chan, IPU_ALPHA_IN_BUFFER, 0); CHECK_RETCODE(ret < 0, "ipu_sel_buf icrot-ic-a", STATE_SEL_BUF_FAIL, chan_buf, ret); } } ret = ipu_select_buffer(ipu, t->set.ic_chan, IPU_OUTPUT_BUFFER, 0); CHECK_RETCODE(ret < 0, "ipu_sel_buf ic_and_rot-ic-o", STATE_SEL_BUF_FAIL, chan_buf, ret); if (deinterlace_3_field(t)) ipu_select_multi_vdi_buffer(ipu, 0); else { ret = ipu_select_buffer(ipu, t->set.ic_chan, IPU_INPUT_BUFFER, 0); CHECK_RETCODE(ret < 0, "ipu_sel_buf ic_and_rot-ic-i", STATE_SEL_BUF_FAIL, chan_buf, ret); } } /*在ic_and_rot模式下，很显然需要使能t->set.rot_chan和t->set.ic_chan两个channel，同时根据deinterlace_3_field(t)这个函数决定是否使能t->set.vdi_ic_p_chan和t->set.vdi_ic_n_chan这两个channel。之后调用ipu_select_buffer函数为t->set.rot_chanchannel选择IPU_OUTPUT_BUFFERbuffer，同样需要为t->set.ic_chanchannel选择IPU_OUTPUT_BUFFERbuffer，根据deinterlace_3_field(t)函数来决定是否调用ipu_select_multi_vdi_buffer函数。如果使能了channel的话，就需要为这个channel选择buffer。*/
if (need_split(t)) t->state = STATE_IN_PROGRESS;
/*如果需要拆分的话，就将t->state置位。*/
if (t->set.mode & VDOA_BAND_MODE) { ret = vdoa_start(t->vdoa_handle, VDOA_DEF_TIMEOUT_MS); CHECK_RETCODE(ret < 0, "vdoa_wait4complete, do_vdoa_band", STATE_VDOA_IRQ_TIMEOUT, chan_rel, ret); } /*如果是VDOA_BAND_MODE模式的话，就需要调用vdoa_start函数来启用vdoa.*/
CHECK_PERF(&t->ts_waitirq); ret = wait_for_completion_timeout(&t->irq_comp, msecs_to_jiffies(t->timeout - DEF_DELAY_MS)); CHECK_PERF(&t->ts_wakeup); CHECK_RETCODE(ret == 0, "wait_for_comp_timeout", STATE_IRQ_TIMEOUT, chan_rel, ret); dev_dbg(t->dev, "[0x%p] no-0x%x ipu irq done!", t, t->task_no);
/*等待完成量超时。对完成量不清楚，以后再查查这一块。*/
chan_rel: chan_buf: chan_en: chan_setup: if (t->set.mode & VDOA_BAND_MODE) vdoa_stop(t->vdoa_handle); do_task_release(t, t->state >= STATE_ERR); return; }
这个do_task函数是一个比较重要的函数，它在get_res_do_task和下一个do_task_vdoa_vdi函数中调用。
43.do_task_vdoa_vdi函数
static void do_task_vdoa_vdi(struct ipu_task_entry *t) { int i; int ret; u32 stripe_width; /* FIXME: crop mode not support now */ stripe_width = t->input.width >> 1; t->input.crop.pos.x = 0; t->input.crop.pos.y = 0; t->input.crop.w = stripe_width; t->input.crop.h = t->input.height; t->output.crop.w = stripe_width; t->output.crop.h = t->input.height; for (i = 0; i < 2; i++) { t->input.crop.pos.x = t->input.crop.pos.x + i * stripe_width; t->output.crop.pos.x = t->output.crop.pos.x + i * stripe_width; /* check input */ ret = set_crop(&t->input.crop, t->input.width, t->input.height, t->input.format); if (ret < 0) { ret = STATE_ERR; goto done; } else update_offset(t->input.format, t->input.width, t->input.height, t->input.crop.pos.x, t->input.crop.pos.y, &t->set.i_off, &t->set.i_uoff, &t->set.i_voff, &t->set.istride); dev_dbg(t->dev, "i_off:0x%x, i_uoff:0x%x, istride:%d.\n", t->set.i_off, t->set.i_uoff, t->set.istride); /* check output */ ret = set_crop(&t->output.crop, t->input.width, t->output.height, t->output.format); if (ret < 0) { ret = STATE_ERR; goto done; } else update_offset(t->output.format, t->output.width, t->output.height, t->output.crop.pos.x, t->output.crop.pos.y, &t->set.o_off, &t->set.o_uoff, &t->set.o_voff, &t->set.ostride); dev_dbg(t->dev, "o_off:0x%x, o_uoff:0x%x, ostride:%d.\n", t->set.o_off, t->set.o_uoff, t->set.ostride); do_task(t); } return; done: dev_err(t->dev, "ERR %s set_crop.\n", __func__); t->state = ret; return; }这个函数里面有一条注释：/*FIXME: crop mode not support now */，crop模式在这里不支持，所以这个函数需要重新设置crop里面的参数，为什么不支持？？这个函数中有个for循环，也不太理解。
首先设置inputcrop，调用set_crop函数，然后继续调用update_offset函数来更新偏移量，之后设置outputcrop，是同样的步骤。最后就会调用到上一个里面讲的do_task函数。这个函数只被get_res_do_task调用了。
44.get_res_do_task函数
static void get_res_do_task(struct ipu_task_entry *t) { uint32_tfound; uint32_tsplit_child; struct mutex*lock; found = get_vdoa_ipu_res(t); if (!found) { dev_err(t->dev, "ERR:[0x%p] no-0x%x can not get res\n", t, t->task_no); return; } else { if (t->set.task & VDOA_ONLY) do_task_vdoa_only(t); else if ((IPU_PIX_FMT_TILED_NV12F == t->input.format) && (t->set.mode & VDOA_BAND_MODE) && (t->input.crop.w > soc_max_vdi_in_width(t->ipu))) do_task_vdoa_vdi(t); else do_task(t); put_vdoa_ipu_res(t, 0); } if (t->state != STATE_OK) { dev_err(t->dev, "ERR:[0x%p] no-0x%x state: %s\n", t, t->task_no, state_msg[t->state].msg); } split_child = need_split(t) && t->parent; if (split_child) { lock = &t->parent->split_lock; mutex_lock(lock); t->split_done = 1; mutex_unlock(lock); wake_up(&t->parent->split_waitq); } return; }这个函数首先调用get_vdoa_ipu_res函数来获取资源，然后根据t->set.task中的task模式决定调用do_task_vdoa_only，do_task_vdoa_vdi和do_task函数中的哪一个。这个函数在ipu_task_thread函数中直接使用。
45.wait_split_task_complete函数
static void wait_split_task_complete(struct ipu_task_entry *parent, struct ipu_split_task *sp_task, uint32_t size) { struct ipu_task_entry *tsk = NULL; int ret = 0, rc; int j, idx = -1; unsigned long flags; struct mutex *lock = &parent->split_lock; int k, busy_vf, busy_pp; struct ipu_soc *ipu; DECLARE_PERF_VAR; for (j = 0; j < size; j++) { rc = wait_event_timeout( parent->split_waitq, <span style="color:#FF0000;">sp_task_check_done(sp_task, parent, size, &idx), </span>msecs_to_jiffies(parent->timeout - DEF_DELAY_MS)); if (!rc) { dev_err(parent->dev, "ERR:[0x%p] no-0x%x, split_task timeout,j:%d," "size:%d.\n", parent, parent->task_no, j, size); ret = -ETIMEDOUT; goto out; } else { if (idx < 0) { dev_err(parent->dev, "ERR:[0x%p] no-0x%x, invalid task idx:%d\n", parent, parent->task_no, idx); continue; } tsk = sp_task[idx].child_task; mutex_lock(lock); if (!tsk->split_done || !tsk->ipu) dev_err(tsk->dev, "ERR:no-0x%x,split not done:%d/null ipu:0x%p\n", tsk->task_no, tsk->split_done, tsk->ipu); tsk->split_done = 0; mutex_unlock(lock); dev_dbg(tsk->dev, "[0x%p] no-0x%x sp_tsk[%d] done,state:%d.\n", tsk, tsk->task_no, idx, tsk->state); #ifdef DBG_IPU_PERF CHECK_PERF(&tsk->ts_rel); PRINT_TASK_STATISTICS; #endif } } out: if (ret == -ETIMEDOUT) { /* debug */ for (k = 0; k < max_ipu_no; k++) { ipu = ipu_get_soc(k); if (IS_ERR(ipu)) { dev_err(parent->dev, "no:0x%x, null ipu:%d\n", parent->task_no, k); } else { busy_vf = ic_vf_pp_is_busy(ipu, true); busy_pp = ic_vf_pp_is_busy(ipu, false); dev_err(parent->dev, "ERR:ipu[%d] busy_vf:%d, busy_pp:%d.\n", k, busy_vf, busy_pp); } } for (k = 0; k < size; k++) { tsk = sp_task[k].child_task; if (!tsk) continue; dev_err(parent->dev, "ERR: sp_task[%d][0x%p] no-0x%x done:%d," "state:%s,on_list:%d, ipu:0x%p,timeout!\n", k, tsk, tsk->task_no, tsk->split_done, state_msg[tsk->state].msg, tsk->task_in_list, tsk->ipu); } } for (j = 0; j < size; j++) { tsk = sp_task[j].child_task; if (!tsk) continue; spin_lock_irqsave(&ipu_task_list_lock, flags); if (tsk->task_in_list) { list_del(&tsk->node); tsk->task_in_list = 0; dev_dbg(tsk->dev, "[0x%p] no-0x%x,id:%d sp_tsk timeout list_del.\n", tsk, tsk->task_no, tsk->task_id); } spin_unlock_irqrestore(&ipu_task_list_lock, flags); if (!tsk->ipu) continue; if (tsk->state != STATE_OK) { dev_err(tsk->dev, "ERR:[0x%p] no-0x%x,id:%d, sp_tsk state: %s\n", tsk, tsk->task_no, tsk->task_id, state_msg[tsk->state].msg); } kref_put(&tsk->refcount, task_mem_free); } kfree(parent->vditmpbuf[0]); kfree(parent->vditmpbuf[1]); if (ret < 0) parent->state = STATE_TIMEOUT; else parent->state = STATE_OK; return; }这个函数的核心就是sp_task_check_done函数，我在里面标红了，它根据数组中的子task，检验每个子task是否执行完毕。
46.find_task函数
static inline int find_task(struct ipu_task_entry **t, int thread_id) { int found; unsigned long flags; struct ipu_task_entry *tsk; struct list_head *task_list = &ipu_task_list; /*这个ipu_task_list是一个全局链表，在ipu_queue_task函数中调用list_add_tail(&tsk->node,&ipu_task_list)往这个链表中添加成员。*/
*t = NULL; spin_lock_irqsave(&ipu_task_list_lock, flags); found = !list_empty(task_list); if (found) { tsk = list_first_entry(task_list, struct ipu_task_entry, node); if (tsk->task_in_list) { list_del(&tsk->node); tsk->task_in_list = 0; *t = tsk; kref_get(&tsk->refcount); dev_dbg(tsk->dev, "thread_id:%d,[0x%p] task_no:0x%x,mode:0x%x list_del\n", thread_id, tsk, tsk->task_no, tsk->set.mode); } else dev_err(tsk->dev, "thread_id:%d,task_no:0x%x,mode:0x%x not on list_del\n", thread_id, tsk->task_no, tsk->set.mode); } spin_unlock_irqrestore(&ipu_task_list_lock, flags); return found; } 可以看出来，这个函数就是从ipu_task_list这个全局链表中取出第一项，如果不为空的话，就返回找到的这一项，将找到的这一项保存在函数的第一个参数t中。
47.ipu_task_thread函数
static int ipu_task_thread(void *argv) { struct ipu_task_entry *tsk; struct ipu_task_entry *sp_tsk0; struct ipu_split_task sp_task[4]; /* priority lower than irq_thread */ const struct sched_param param = { .sched_priority = MAX_USER_RT_PRIO/2 - 1, }; int ret; int curr_thread_id; uint32_t size; unsigned long flags; unsigned int cpu; struct cpumask cpu_mask; struct ipu_thread_data *data = (struct ipu_thread_data *)argv; thread_id++; curr_thread_id = thread_id; sched_setscheduler(current, SCHED_FIFO, ¶m); /*这个函数的用法可以查看http://blog.csdn.net/allwtg/article/details/5254306里面的解释。它的目的是将current这个进程的policy设置成SCHED_FIFO，优先级设置成param->sched_priority。*/
if (!data->is_vdoa) { cpu = cpumask_first(cpu_online_mask); cpumask_set_cpu(cpu, &cpu_mask); ret = sched_setaffinity(data->ipu->thread[data->id]->pid, &cpu_mask); if (ret < 0) { pr_err("%s: sched_setaffinity fail:%d.\n", __func__, ret); } pr_debug("%s: sched_setaffinity cpu:%d.\n", __func__, cpu); } while (!kthread_should_stop()) { int split_fail = 0; int split_parent; int split_child; wait_event_interruptible(thread_waitq, find_task(&tsk, curr_thread_id)); /*如果找到当前的task的话，就让thread_waitq这个等待队列进入等待状态，会在本函数和ipu_queue_task函数中唤醒它的。*/
if (!tsk) { pr_err("thread:%d can not find task.\n", curr_thread_id); continue; } /* note: other threads run split child task */ split_parent = need_split(tsk) && !tsk->parent; split_child = need_split(tsk) && tsk->parent; /*找到split_parent和split_child的方法很简单，它就是根据tsk中set.split_mode和task_no来决定task是否需要拆分。如果需要拆分的话，同时这个ipu_task_entry结构体中的parent没有置位的话，就说明它本身就是parent。*/
if (split_parent) { if ((tsk->set.split_mode == RL_SPLIT) || (tsk->set.split_mode == UD_SPLIT)) size = 2; else size = 4; ret = queue_split_task(tsk, sp_task, size); /*设置queue_split_task函数中的size值，然后根据size的值调用queue_split_task函数来创建拆分的子task，并将它们都保存在sp_task数组中。*/
if (ret < 0) { split_fail = 1; } else { struct list_head *pos; spin_lock_irqsave(&ipu_task_list_lock, flags); sp_tsk0 = list_first_entry(&tsk->split_list, struct ipu_task_entry, node); list_del(&sp_tsk0->node); list_for_each(pos, &tsk->split_list) { struct ipu_task_entry *tmp; tmp = list_entry(pos, struct ipu_task_entry, node); tmp->task_in_list = 1; dev_dbg(tmp->dev, "[0x%p] no-0x%x,id:%d sp_tsk " "add_to_list.\n", tmp, tmp->task_no, tmp->task_id); } /* add to global list */ list_splice(&tsk->split_list, &ipu_task_list); spin_unlock_irqrestore(&ipu_task_list_lock, flags); /* let the parent thread do the first sp_task */ /* FIXME: ensure the correct sequence for split 4size: 5/6->9/a*/ if (!sp_tsk0) dev_err(tsk->dev, "ERR: no-0x%x,can not get split_tsk0\n", tsk->task_no); wake_up_interruptible(&thread_waitq); get_res_do_task(sp_tsk0); dev_dbg(sp_tsk0->dev, "thread:%d complete tsk no:0x%x.\n", curr_thread_id, sp_tsk0->task_no); ret = atomic_read(&req_cnt); if (ret > 0) { wake_up(&res_waitq); dev_dbg(sp_tsk0->dev, "sp_tsk0 sche thread:%d no:0x%x," "req_cnt:%d\n", curr_thread_id, sp_tsk0->task_no, ret); /* For other threads to get_res */ schedule(); } } } else get_res_do_task(tsk); /*这一块的逻辑比较乱，但是整体可以理解的是无论哪种情况，最终都会调用到get_res_do_task函数。应该是如果创建了子task的话，每个子task都会执行一个get_res_do_task函数。看下面的注释。*/
/* wait for all 4 sp_task finished here or timeout and then release all resources */ if (split_parent && !split_fail) wait_split_task_complete(tsk, sp_task, size);
/*等待子task都执行完。*/
if (!split_child) { atomic_inc(&tsk->done); wake_up(&tsk->task_waitq); } dev_dbg(tsk->dev, "thread:%d complete tsk no:0x%x-[0x%p].\n", curr_thread_id, tsk->task_no, tsk); ret = atomic_read(&req_cnt); if (ret > 0) { wake_up(&res_waitq); dev_dbg(tsk->dev, "sche thread:%d no:0x%x,req_cnt:%d\n", curr_thread_id, tsk->task_no, ret); /* note: give cpu to other threads to get_res */ schedule(); } kref_put(&tsk->refcount, task_mem_free); 48.ipu_check_task函数
int ipu_check_task(struct ipu_task *task) { struct ipu_task_entry *tsk; int ret = 0; tsk = create_task_entry(task); if (IS_ERR(tsk)) return PTR_ERR(tsk); ret = check_task(tsk); task->input = tsk->input; task->output = tsk->output; task->overlay = tsk->overlay; dump_task_info(tsk); kref_put(&tsk->refcount, task_mem_free); if (ret != 0) pr_debug("%s ret:%d.\n", __func__, ret); return ret; } EXPORT_SYMBOL_GPL(ipu_check_task);这个函数里面没做什么内容，只是调用create_task_entry创建了一个ipu_task_entry实体，然后调用check_task函数来检验这个结构体里面的设置是否正确。这个ipu_check_task函数在mxc_ipu_ioctl的IPU_CHECK_TASK中调用。
49.ipu_queue_task函数
int ipu_queue_task(struct ipu_task *task) { struct ipu_task_entry *tsk; unsigned long flags; int ret; u32 tmp_task_no; DECLARE_PERF_VAR; tsk = create_task_entry(task); if (IS_ERR(tsk)) return PTR_ERR(tsk); CHECK_PERF(&tsk->ts_queue); ret = prepare_task(tsk); if (ret < 0) goto done; /*首先调用create_task_entry函数来创建一个ipu_task_entry实体，然后调用prepare_task函数来继续设置这个结构体中的某些位。*/
if (need_split(tsk)) { CHECK_PERF(&tsk->ts_dotask); CHECK_PERF(&tsk->ts_waitirq); CHECK_PERF(&tsk->ts_inirq); CHECK_PERF(&tsk->ts_wakeup); } /* task_no last four bits for split task type*/ tmp_task_no = atomic_inc_return(&frame_no); tsk->task_no = tmp_task_no << 4; init_waitqueue_head(&tsk->task_waitq); spin_lock_irqsave(&ipu_task_list_lock, flags); list_add_tail(&tsk->node, &ipu_task_list); tsk->task_in_list = 1; dev_dbg(tsk->dev, "[0x%p,no-0x%x] list_add_tail\n", tsk, tsk->task_no); spin_unlock_irqrestore(&ipu_task_list_lock, flags); wake_up_interruptible(&thread_waitq); ret = wait_event_timeout(tsk->task_waitq, atomic_read(&tsk->done), msecs_to_jiffies(tsk->timeout)); if (0 == ret) { /* note: the timeout should larger than the internal timeout!*/ ret = -ETIMEDOUT; dev_err(tsk->dev, "ERR: [0x%p] no-0x%x, timeout:%dms!\n", tsk, tsk->task_no, tsk->timeout); } else { if (STATE_OK != tsk->state) { dev_err(tsk->dev, "ERR: [0x%p] no-0x%x,state %d: %s\n", tsk, tsk->task_no, tsk->state, state_msg[tsk->state].msg); ret = -ECANCELED; } else ret = 0; } spin_lock_irqsave(&ipu_task_list_lock, flags); if (tsk->task_in_list) { list_del(&tsk->node); tsk->task_in_list = 0; dev_dbg(tsk->dev, "[0x%p] no:0x%x list_del\n", tsk, tsk->task_no); } spin_unlock_irqrestore(&ipu_task_list_lock, flags); #ifdef DBG_IPU_PERF CHECK_PERF(&tsk->ts_rel); PRINT_TASK_STATISTICS; if (ts_frame_avg == 0) ts_frame_avg = ts_frame.tv_nsec / NSEC_PER_USEC + ts_frame.tv_sec * USEC_PER_SEC; else ts_frame_avg = (ts_frame_avg + ts_frame.tv_nsec / NSEC_PER_USEC + ts_frame.tv_sec * USEC_PER_SEC)/2; if (timespec_compare(&ts_frame, &ts_frame_max) > 0) ts_frame_max = ts_frame; atomic_inc(&frame_cnt); if ((atomic_read(&frame_cnt) % 1000) == 0) pr_debug("ipu_dev: max frame time:%ldus, avg frame time:%dus," "frame_cnt:%d\n", ts_frame_max.tv_nsec / NSEC_PER_USEC + ts_frame_max.tv_sec * USEC_PER_SEC, ts_frame_avg, atomic_read(&frame_cnt)); #endif done: if (ret < 0) dev_err(tsk->dev, "ERR: no-0x%x,ipu_queue_task err:%d\n", tsk->task_no, ret); kref_put(&tsk->refcount, task_mem_free); return ret; } EXPORT_SYMBOL_GPL(ipu_queue_task);对于这个函数后面的部分，个人感觉重要的就是wake_up_interruptible(&thread_waitq)函数，它唤醒在ipu_task_thread函数中睡眠的thread_waitq队列，让这个函数继续往下执行，就能执行到get_res_do_task函数来处理task了。所以在应用程序中，首先调用IPU_CHECK_TASKioctl宏以后还需要调用IPU_QUEUE_TASKtask宏，这样程序才能往下面执行下去。
后面的几个函数就是围绕file_operations结构体来构建的，以及register_ipu_device和unregister_ipu_device两个函数，这些都在（一）中分析过了，在这就不再分析。至此，这个文件分析完毕。
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