[RK3288][Android7.1.2] kernel移植 : rk808+edp

平台：Rockchip

处理器：rk3288

Android版本：Android 7.1.2

内核版本：Linux 4.4.71

第一步：将最接近的dts拷贝一份并重新命名。

rk3288\kernel\arch\arm\boot\dts\rk3288-evb-android-rk818-edp.dts

拷贝一份并命名如下：

rk3288\kernel\arch\arm\boot\dts\rk3288-evb-android-rk808-edp.dts

第二步：修改对应的PMU，根据第一步拷贝而来的PMU是RK818，我们平板所用的PMU是RK808

所以做以下的几个修改：

//compatible = "rockchip,rk3288-evb-android-rk818", "rockchip,rk3288";compatible = "rockchip,rk3288-evb-android-rk808", "rockchip,rk3288";

sdio_pwrseq: sdio-pwrseq {  compatible = "mmc-pwrseq-simple";  //clocks = <&rk818 1>;    clocks = <&rk808 1>;//rk818 1>;

wireless-bluetooth {  //clocks = <&rk818 1>;  clocks = <&rk808 1>;//rk818 1>;  clock-names = "ext_clock";};

&i2c0 {clock-frequency = <400000>;//rk818: pmic@1c {rk808: pmic@1b {}

第三步：注意保留 vcc_lcd 即可,注意pmu里面也有一个vcc_lcd相关的应该舍去：

vcc_lcd: vcc-lcd {  compatible = "regulator-fixed";  regulator-boot-on;  enable-active-high;  gpio = <&gpio7 3 GPIO_ACTIVE_HIGH>;  pinctrl-names = "default";  pinctrl-0 = <&lcd_en>;  regulator-name = "vcc_lcd";  vin-supply = <&vcc_io>;};

至此，pmic相关的就已经配置好了。我们再来根据edp相关的配置点亮屏幕。检查下dts以下四个与edp相关的选择是否正确，如下：

&edp {status = "okay";};

&edp_panel {compatible ="lg,lp079qx1-sp0v", "simple-panel";enable-gpios = <&gpio7 4 GPIO_ACTIVE_HIGH>;pinctrl-0 = <&lcd_cs>;power-supply = <&vcc_lcd>;delay,prepare = <120>;status = "okay";

disp_timings: display-timings {  native-mode = <&timing0>;  timing0: timing0 {  clock-frequency = <200000000>;  hactive = <1536>;  vactive = <2048>;  hfront-porch = <12>;  hsync-len = <16>;  hback-porch = <48>;  vfront-porch = <8>;  vsync-len = <4>;  vback-porch = <8>;  hsync-active = <0>;  vsync-active = <0>;  de-active = <0>;  pixelclk-active = <0>;  };};

&edp_phy {status = "okay";};

&route_edp {status = "okay";};

在Android5.1的SDK里面，Rockchip是这样用一个dtsi包裹起来的参数：

/ {disp_timings: display-timings {  native-mode = <&timing0>;  timing0: timing0 {    screen-type = <SCREEN_EDP>;    out-face    = <OUT_P666>;    clock-frequency = <205000000>;    hactive = <1536>;    vactive = <2048>;    hback-porch = <5>;    hfront-porch = <150>;    vback-porch = <9>;    vfront-porch = <3>;    hsync-len = <5>;    vsync-len = <1>;    hsync-active = <0>;    vsync-active = <0>;    de-active = <0>;    pixelclk-active = <1>;    swap-rb = <0>;    swap-rg = <0>;    swap-gb = <0>;   };  };};

如今应该在驱动文件：rk3288\kernel\drivers\gpu\drm\panel\panel-simple.c

static const struct of_device_id platform_of_match[] = 

{  {  .compatible = "simple-panel",  .data = NULL,  }, {  }, {  .compatible = "lg,lp079qx1-sp0v",  .data = &lg_lp079qx1_sp0v,  }, }

对应的dts里面的兼容：

compatible ="lg,lp079qx1-sp0v", "simple-panel";

static const struct drm_display_mode lg_lp079qx1_sp0v_mode = {// .clock = 200000,// .hdisplay = 1536,// .hsync_start = 1536 + 12,// .hsync_end = 1536 + 12 + 16,// .htotal = 1536 + 12 + 16 + 48,// .vdisplay = 2048,// .vsync_start = 2048 + 8,// .vsync_end = 2048 + 8 + 4,// .vtotal = 2048 + 8 + 4 + 8,// .vrefresh = 60,.clock = 205000,.hdisplay = 1536,.hsync_start = 1536 + 150,.hsync_end = 1536 + 150 + 5,.htotal = 1536 + 150 + 5 + 5,.vdisplay = 2048,.vsync_start = 2048 + 3,.vsync_end = 2048 + 3 + 9,.vtotal = 2048 + 3 + 9 + 1,.vrefresh = 60,.flags = DRM_MODE_FLAG_NVSYNC | DRM_MODE_FLAG_NHSYNC,};

static const struct panel_desc lg_lp079qx1_sp0v = {  .modes = &lg_lp079qx1_sp0v_mode,  .num_modes = 1,  .size = {    .width = 129,    .height = 171,  },  .bus_format = MEDIA_BUS_FMT_RGB666_1X18,};