转载自 http://blog.csdn.net/mahao1107/article/details/53404495
cm驱动的源代码解读
在我们调屏之前,我们一定要弄懂源代码框架以及每一行代码代表的意思,那么就让我们首先来看看代码(以ili9806e为例)
1 #if defined(BUILD_LK) 2 #include <string.h> 3 #else 4 #include <linux/string.h> 5 #endif 6 7 #ifdef BUILD_LK 8 #include <platform/disp_drv_platform.h> 9 10 #elif defined(BUILD_UBOOT) 11 #include <asm/arch/mt_gpio.h> 12 #else 13 14 #include <mach/mt_gpio.h> 15 #endif 16 #include <cust_gpio_usage.h> 17 18 #include "lcm_drv.h" 19 20 22 23 24 25 26 #define FRAME_WIDTH (480) 27 #define FRAME_HEIGHT (800) 28 29 #define REGFLAG_DELAY 0xFD 30 #define REGFLAG_END_OF_TABLE 0xFE // END OF REGISTERS MARKER 31 32 #define LCM_DSI_CMD_MODE 0 33 34 35 #ifndef TRUE 36 #define TRUE 1 37 #endif 38 39 #ifndef FALSE 40 #define FALSE 0 41 #endif 42 43 #define GPIO_LCM_ID GPIO18 44 #define LCM_TDT 0 45 46 bool lcm_ili9806e_vendor=LCM_TDT; 47 48 49 50 #define LCM_ID_ILI9806E (0x980604) 51 52 #define LCM_DEBUG 53 54 55 56 57 58 59 60 static LCM_UTIL_FUNCS lcm_util = {0}; 61 62 63 #define SET_RESET_PIN(v) (lcm_util.set_reset_pin((v))) //这里就会直接使用GPIO_LCD_RST硬引脚 64 #define UDELAY(n) (lcm_util.udelay(n)) 65 #define MDELAY(n) (lcm_util.mdelay(n)) 66 68 69 70 71 72 73 #define dsi_set_cmdq_V2(cmd, count, ppara, force_update) lcm_util.dsi_set_cmdq_V2(cmd, count, ppara, force_update) 74 #define dsi_set_cmdq(pdata, queue_size, force_update) lcm_util.dsi_set_cmdq(pdata, queue_size, force_update) 75 76 77 #define wrtie_cmd(cmd) lcm_util.dsi_write_cmd(cmd) 78 #define write_regs(addr, pdata, byte_nums) lcm_util.dsi_write_regs(addr, pdata, byte_nums) 79 #define read_reg(cmd) lcm_util.dsi_dcs_read_lcm_reg(cmd) 80 #define read_reg_v2(cmd, buffer, buffer_size) lcm_util.dsi_dcs_read_lcm_reg_v2(cmd, buffer, buffer_size) 81 82 83 struct LCM_setting_table { 84 unsigned char cmd; 85 unsigned char count; 86 unsigned char para_list[64]; 87 }; 88 90 91 static struct LCM_setting_table lcm_initialization_setting[] = { 92 93 94 95 {0xFF,5,{0xFF,0x98,0x06,0x04,0x01}}, 96 {0x08,1,{0x10}}, 97 {0x21,1,{0x01}}, 98 {0x30,1,{0x02}}, 99 {0x31,1,{0x00}},100 {0x60,1,{0x07}},101 {0x61,1,{0x04}},102 {0x62,1,{0x08}},103 {0x63,1,{0x04}},104 {0x40,1,{0x10}},105 {0x41,1,{0x44}},106 {0x42,1,{0x03}},107 {0x43,1,{0x89}},108 {0x44,1,{0x86}},109 .....(此处省略代码n条初始化代码)234 {0x11,1,{0x00}}, 235 {REGFLAG_DELAY,120,{}},236 {0x29,1,{0x00}},237 {REGFLAG_DELAY, 20, {}},238 239 {REGFLAG_END_OF_TABLE, 0x00, {}}240 };241 420 421 static void push_table(struct LCM_setting_table *table, unsigned int count, unsigned char force_update)422 {423 unsigned int i;424 425 for(i = 0; i < count; i++) {426 427 unsigned cmd;428 cmd = table[i].cmd;429 430 switch (cmd) {431 432 case REGFLAG_DELAY :433 MDELAY(table[i].count);434 break;435 436 case REGFLAG_END_OF_TABLE :437 break;438 439 default:440 dsi_set_cmdq_V2(cmd, table[i].count, table[i].para_list, force_update);441 }442 }443 444 }445 448 449 450 451 452 static void lcm_set_util_funcs(const LCM_UTIL_FUNCS *util)453 {454 memcpy(&lcm_util, util, sizeof(LCM_UTIL_FUNCS));455 }456 457 458 459 static void lcm_get_params(LCM_PARAMS *params)460 {461 memset(params, 0, sizeof(LCM_PARAMS)); 462 463 params->type = LCM_TYPE_DSI; 464 465 params->width = FRAME_WIDTH; 466 params->height = FRAME_HEIGHT; 467 468 469 470 471 #ifndef BUILD_UBOOT472 473 474 params->dbi.te_mode = LCM_DBI_TE_MODE_DISABLED;475 #endif476 477 478 #if (LCM_DSI_CMD_MODE) 479 params->dsi.mode = CMD_MODE; 480 #else481 params->dsi.mode = SYNC_PULSE_VDO_MODE;482 #endif483 484 485 486 487 488 params->dsi.LANE_NUM = LCM_TWO_LANE; 489 490 params->dsi.data_format.color_order = LCM_COLOR_ORDER_RGB;491 params->dsi.data_format.trans_seq = LCM_DSI_TRANS_SEQ_MSB_FIRST;492 params->dsi.data_format.padding = LCM_DSI_PADDING_ON_LSB;493 params->dsi.data_format.format = LCM_DSI_FORMAT_RGB888;494 495 496 497 params->dsi.packet_size=256;498 499 500 params->dsi.intermediat_buffer_num = 2;501 502 params->dsi.PS=LCM_PACKED_PS_24BIT_RGB888;503 504 505 506 params->dsi.vertical_sync_active = 6;507 params->dsi.vertical_backporch = 14;508 params->dsi.vertical_frontporch = 20;509 params->dsi.vertical_active_line = FRAME_HEIGHT;510 511 512 513 params->dsi.horizontal_sync_active = 10;514 params->dsi.horizontal_backporch = 80;515 params->dsi.horizontal_frontporch = 80;516 params->dsi.horizontal_active_pixel = FRAME_WIDTH;517 518 519 520 521 522 523 524 params->dsi.PLL_CLOCK = 130;525 526 527 }528 529 530 531 static bool lcm_select_panel(void)532 {533 int value=0;534 535 mt_set_gpio_mode(GPIO_LCM_ID,GPIO_MODE_00);536 537 mt_set_gpio_pull_enable(GPIO_LCM_ID, GPIO_PULL_DISABLE);538 539 mt_set_gpio_dir(GPIO_LCM_ID, GPIO_DIR_IN);540 541 value+=mt_get_gpio_in(GPIO_LCM_ID);542 if(value)543 return LCM_TDT;544 545 return LCM_TDT;546 }547 548 549 550 551 552 static void lcm_init(void)553 {554 560 561 562 SET_RESET_PIN(1);563 SET_RESET_PIN(0);564 MDELAY(100);565 SET_RESET_PIN(1);566 MDELAY(50);567 568 569 push_table(lcm_initialization_setting, sizeof(lcm_initialization_setting) / sizeof(struct LCM_setting_table), 1);570 }571 572 573 574 580 static void lcm_suspend(void)581 {582 #ifdef BUILD_LK 583 printf("%s, ALS/PS bbbbbbbbbbbbbbb \n", __func__); 584 #else585 printk("%s, ALS/PS bbbbbbbbbbbbbb \n", __func__); 586 #endif587 588 push_table(lcm_deep_sleep_mode_in_setting, sizeof(lcm_deep_sleep_mode_in_setting) / sizeof(struct LCM_setting_table), 1);589 }590 591 592 593 594 static void lcm_resume(void)595 {596 597 lcm_init();598 599 600 601 }602 603 604 605 606 static void lcm_update(unsigned int x, unsigned int y,607 unsigned int width, unsigned int height)608 {609 unsigned int x0 = x;610 unsigned int y0 = y;611 unsigned int x1 = x0 + width - 1;612 unsigned int y1 = y0 + height - 1;613 614 unsigned char x0_MSB = ((x0>>8)&0xFF);615 unsigned char x0_LSB = (x0&0xFF);616 unsigned char x1_MSB = ((x1>>8)&0xFF);617 unsigned char x1_LSB = (x1&0xFF);618 unsigned char y0_MSB = ((y0>>8)&0xFF);619 unsigned char y0_LSB = (y0&0xFF);620 unsigned char y1_MSB = ((y1>>8)&0xFF);621 unsigned char y1_LSB = (y1&0xFF);622 623 unsigned int data_array[16];633 dsi_set_cmdq(data_array, 7, 0);634 635 }636 637 638 static unsigned int lcm_esd_test = FALSE; 639 640 static unsigned int lcm_esd_check(void)641 {642 #ifndef BUILD_LK643 char buffer[3];644 char buffer2[4];645 int array[4];646 647 if(lcm_esd_test)648 {649 lcm_esd_test = FALSE;650 return TRUE;651 }652 return TRUE;653 #endif654 655 }656 657 static unsigned int lcm_esd_recover(void)658 {659 #ifndef BUILD_LK660 lcm_init();661 662 663 printk("lcm_esd_recover\n");664 665 return TRUE;666 #endif667 }668 669 670 671 static unsigned int lcm_compare_id(void)672 {673 674 int array[4];675 char buffer[5];676 char id_high=0;677 char id_midd=0;678 char id_low=0;679 int id=0;680 681 682 687 688 689 SET_RESET_PIN(1);690 SET_RESET_PIN(0);691 MDELAY(100);692 SET_RESET_PIN(1);693 MDELAY(50);694 695 696 array[0]=0x00063902;697 array[1]=0x0698ffff;698 array[2]=0x00000104;699 dsi_set_cmdq(array, 3, 1);700 MDELAY(10);701 702 703 array[0]=0x00033700;704 dsi_set_cmdq(array, 1, 1);705 706 707 read_reg_v2(0x00, buffer,1);708 id_high = buffer[0]; 709 710 read_reg_v2(0x01, buffer,1);711 id_midd = buffer[0]; 712 713 read_reg_v2(0x02, buffer,1);714 id_low = buffer[0]; 715 716 id =(id_high << 16) | (id_midd << 8) | id_low;717 718 #if defined(BUILD_LK)719 printf("ILI9806E compare-LK:0x%02x,0x%02x,0x%02x,0x%02x\n", id_high, id_midd, id_low, id);720 #else721 printk("ILI9806E compare:0x%02x,0x%02x,0x%02x,0x%02x\n", id_high, id_midd, id_low, id);722 #endif723 724 return (id == LCM_ID_ILI9806E)?1:0;725 }726 727 728 729 LCM_DRIVER ili9806e_wvga_dsi_vdo_lcm_drv=730 {731 .name = "ili9806e_wvga_dsi_vdo", 732 .set_util_funcs = lcm_set_util_funcs, 733 .get_params = lcm_get_params, 734 .init = lcm_init, 735 .suspend = lcm_suspend, 736 .resume = lcm_resume, 737 .compare_id = lcm_compare_id, 738 .esd_check = lcm_esd_check, 739 .esd_recover = lcm_esd_recover, 740 #if (LCM_DSI_CMD_MODE)741 .update = lcm_update, 742 #endif743 };744
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一般情况下lcm驱动无非就是这些函数组成,当然lcm屏厂商当然会给我们提供一些初始化代码,以及lcm屏数据手册,这些是我们要认真看的。
lcm移植过程:
lk: 在内核目录下bootable/bootloader/lk/dev/lcm/下存放的是各种lcm厂商的lcm驱动,其中也有一个mt67xx_lcm_list.c文件,
里面定义了所有的lcm驱动)1.移植是首先要在lcm/目录下建立一个所移植的那个lcm屏的目录文件夹,目录文件夹名字选取是根据你所定义的设备名统一。2.在建的这个目录下添加lcm驱动和makefile文件,如果你有lcm驱动就放在这个目录下,如果没有,就找lcm目录下其他的lcm驱动
文件夹中的.c文件进行修改后放在此目录下3.准备工作做好后,修改文件主要有几个,一个是mt67xx_list.c: 在这个文件中加入你所添加的驱动定义:格式和方法参照文件中其他lcm的定义。另一个是bootable/blltloader/lk/project/这个目录下有你编译的工程文件(就是你lunch的时候选取的那个文件,Project.mk).mk文件, 在这个文件下主要修改的是CUSTOM_LK_LCM、和BOOT_LOGO,把这两个修改成你移植的对应的参数,CUSTOM_LK_LCM要和你的文件名,目录名,
还有你的.c文件中的.name变量的值统一。logo,以及lcm屏的宽、高,看lcm数据手册。kernel: kernel/drives/misc/mediatek/lcm/....在这个目录下加入和lk当时候加入的是一样的。直接拷贝过来就可以。同样修改mt67xx_lcm_list.c文件kernel-3.10/arch/arm64/configs/..目录下是:工程名_debug_defconfig,和对应:工程名_defconfig这两种文件,其中后缀是debug_defconfig的
文件是eng对应的,而defconfig是user对应的。(在我们的lunch所打印出来的工程中有三种后缀,eng(调试工程)、user(用户工程)、userdebug,进入这个文件后,反斜杠搜索/lcm 然后修改对应的名称和分辨率。编译: make -j12 2>&1 | tee log.txt
上面讲述的仅仅是加入文件的修改过程,至于调试的话,这个是要积累的经验,把所移植好的代码烧进我们对应的板子,然后编译看效果,然后在针对对应的效果进行调试