RK3288Android7.1上10寸mipi屏兼容

需求：RK3288Android7.1上10寸mipi屏兼容
思路：
1、修改屏幕厂商提供的屏幕初始化指令为rk可以识别的格式存放在panel-init-sequence
2、修改屏参display-timings
3、确定reset-gpio

实现：
首先根据屏幕厂商提供的初始化指令将panel-init-sequence填好

//28H & 10H should be sent before host video off
//Resolution:800x1280
//External system porch setting: VS=4 ,VBP=12 ,VFP=20 ,HS=20 ,HBP=80 ,HFP=80
//Frame rate:60HZ     
//Power:VCI=3.3, IOVCC=1.8
//SET_HS_BURST

//序数         reg    1    2    3    4    5    6    7    8    9   10   11   12   13   14   15   16   17   18   19   20   21   22   23   24   25   26   27   28   29   30   31   32   33   34   35   36   37   38

SSD_SEND(,地址，寄存器1的值,寄存器2的值,寄存器3值...)
SSD_SEND(0x01,0xE0,0xAB,0xBA);
SSD_SEND(0x01,0xE1,0xBA,0xAB);
SSD_SEND(0x01,0xB1,0x10,0x01,0x47,0xFF);
SSD_SEND(0x01,0xB2,0x0C,0x14,0x04,0x50,0x50,0x14);
SSD_SEND(0x01,0xB3,0x56,0xD3,0x00);
SSD_SEND(0x01,0xB4,0x33,0x20,0x04);//30 正扫  20反扫
SSD_SEND(0x01,0xB6,0xB0,0x00,0x00,0x10,0x00,0x10,0x00);
SSD_SEND(0x01,0xB8,0x56,0x12,0x29,0x29,0x48);//06 正扫  56 反扫
SSD_SEND(0x01,0xB9,0x7C,0x66,0x57,0x4C,0x49,0x3C,0x42,0x2E,0x48,0x47,0x48,0x66,0x54,0x5B,0x4D,0x4A,0x3D,0x27,0x06,0x7C,0x66,0x57,0x4C,0x49,0x3C,0x42,0x2E,0x48,0x47,0x48,0x66,0x54,0x5B,0x4D,0x4A,0x3D,0x27,0x06);
SSD_SEND(0x01,0xC0,0x32,0x23,0x67,0x67,0x33,0x33,0x33,0x33,0x10,0x04,0x88,0x04,0x3F,0x00,0x00,0xC0);
SSD_SEND(0x01,0xC1,0x13,0x14,0x02,0x08,0x10,0x04,0x7D,0x04,0x54,0x00);
SSD_SEND(0x01,0xC2,0x37,0x09,0x08,0x89,0x88,0x21,0x22,0x21,0x44,0xBB,0x18,0x00);
//SSD_SEND(0x01,0xC3,0x89,0x64,0x24,0x07,0x1F,0x1E,0x02,0x16,0x14,0x02,0x12,0x10,0x02,0x0E,0x0C,0x04,0x02,0x02,0x02,0x02,0x02,0x02);//正扫
//SSD_SEND(0x01,0xC4,0x09,0x24,0x24,0x07,0x1F,0x1E,0x02,0x17,0x15,0x02,0x13,0x11,0x02,0x0F,0x0D,0x05,0x02,0x02,0x02,0x02,0x02,0x02);//正扫
SSD_SEND(0x01,0xC3,0x89,0x64,0x24,0x05,0x1F,0x1E,0x02,0x15,0x17,0x02,0x0D,0x0F,0x02,0x11,0x13,0x07,0x02,0x02,0x02,0x02,0x02,0x02);//反扫
SSD_SEND(0x01,0xC4,0x08,0x24,0x24,0x04,0x1F,0x1E,0x02,0x14,0x16,0x02,0x0C,0x0E,0x02,0x10,0x12,0x06,0x02,0x02,0x02,0x02,0x02,0x02);//反扫
SSD_SEND(0x01,0xC6,0x22,0x22);
SSD_SEND(0x01,0xC8,0x21,0x00,0x32,0x40,0x54,0x16);
SSD_SEND(0x01,0xCA,0xCB,0x43);
SSD_SEND(0x01,0xCD,0x0E,0x4F,0x4F,0x25,0x1E,0x6B,0x06,0xB3);
SSD_SEND(0x01,0xD2,0xE3,0x2B,0x38,0x00);
SSD_SEND(0x01,0xD4,0x00,0x01,0x00,0x0E,0x04,0x44,0x08,0x10,0x00,0x07,0x00);
SSD_SEND(0x01,0xE6,0x80,0x01,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF);
SSD_SEND(0x01,0xF0,0x12,0x03,0x20,0x00,0xFF);
 

DCS_Short_Write_NP(0x11);
Delay(750);//delay 150ms

DCS_Short_Write_NP(0x29);
Delay(100);//delay 20ms

可以看到除了初始化序列，厂商提供了屏参

//Resolution:800x1280
//External system porch setting: VS=4 ,VBP=12 ,VFP=20 ,HS=20 ,HBP=80 ,HFP=80
//Frame rate:60HZ

这样我们可以先将屏参填好

display-timings {
			native-mode = <&timing_mipi_7_inch>;
			timing_mipi_7_inch: timing_mipi_7_inch {
				lane-rante=<600>;
				clock-frequency = <77000000>;

                hactive = <800>;
                vactive = <1280>;

               	hsync-len = <20>;
				hback-porch = <80>;
				hfront-porch = <80>;

				vsync-len = <4>;
				vback-porch = <12>;
				vfront-porch = <20>;

                hsync-active = <0>;
                vsync-active = <0>;
                de-active = <0>;
                pixelclk-active = <0>;
            };
		};

$V S = v sy n c - l e n$
$V BP = v ba c k - p orc h$
$V FP = v f ro n t - p orc h$
$H S = h sy n c - l e n$
$H BP = hba c k - p orc h$
$H FP = h f ro n t - p orc h$
$c l oc k - f re q u e n cy = (v sy n c - l e n + v ba c k - p orc h + v f ro n t - p orc h + v f ro n t - p orc h) * (h sy n c - l e n + hba c k - p orc h + h f ro n t - p orc h) * f p s$
然后将初始化指令转化为rk可以识别的格式
转化规则rk说明书上面有：
在这里插入图片描述

用得比较多的就是DCS Write，0x15,0x39是用的最频繁的。

SSD_SEND(0x01,0xE0,0xAB,0xBA);
转化为
39 00 03 E0 AB BA

初始化指令转化后为：

panel-init-sequence = [
			39 00 03 E0 AB BA
			39 00 03 E1 BA AB
			39 00 05 B1 10 01 47 FF
			39 00 07 B2 0C 14 04 50 50 14
			39 00 04 B3 56 D3 00
			39 00 04 B4 33 20 04
			39 00 08 B6 B0 00 00 10 00 10 00
			39 00 06 B8 56 12 29 29 48
			39 00 27 B9 7C 66 57 4C 49 3C 42 2E 48 47 48 66 54 5B 4D 4A 3D 27 06 7C 66 57 4C 49 3C 42 2E 48 47 48 66 54 5B 4D 4A 3D 27 06
			39 00 11 C0 32 23 67 67 33 33 33 33 10 04 88 04 3F 00 00 C0
			39 00 0B C1 13 14 02 08 10 04 7D 04 54 00
			39 00 0D C2 37 09 08 89 88 21 22 21 44 BB 18 00
			39 00 17 C3 89 64 24 05 1F 1E 02 15 17 02 0D 0F 02 11 13 07 02 02 02 02 02 02
			39 00 17 C4 08 24 24 04 1F 1E 02 14 16 02 0C 0E 02 10 12 06 02 02 02 02 02 02
			39 00 03 C6 22 22
			39 00 07 C8 21 00 32 40 54 16
			39 00 03 CA CB 43
			39 00 09 CD 0E 4F 4F 25 1E 6B 06 B3
			39 00 05 D2 E3 2B 38 00
			39 00 0C D4 00 01 00 0E 04 44 08 10 00 07 00
			39 00 09 E6 80 01 FF FF FF FF FF FF
			39 00 06 F0 12 03 20 00 FF
			05 FF 01 11
        	05 64 01 29
		];

如果还是看不懂指令格式怎么转化的可以看一下这个链接，写得很详细

https://blog.csdn.net/qq_38312843/article/details/107534743

然后我们确定一下reset-gpio就行了
在这里插入图片描述

reset-gpios = <&gpio7 3 GPIO_ACTIVE_HIGH>;

基本上就没什么问题了。
不出意外的话要出意外了，配置好设备树编译烧录后发现，屏幕黑屏，系统起不来，根据串口日志可以发现以下报错信息：

[    0.951745] panel-simple-dsi ff960000.dsi.0: panel_simple_parse_cmds: error, len=79
[    0.951762] panel-simple-dsi ff960000.dsi.0: failed to parse panel init sequence
[    0.951780] panel-simple-dsi ff960000.dsi.0: failed to get init cmd: -22
[    0.951797] panel-simple-dsi: probe of ff960000.dsi.0 failed with error -22

定位代码：
在这里插入图片描述

可以发现是因为单条指令太长了，rk存不下，然后kernel就挂了。
我们需要将存放命令的数组开大一点就行。

--- a/u-boot/drivers/video/screen/lcd_mipi.c
+++ b/u-boot/drivers/video/screen/lcd_mipi.c
@@ -307,7 +307,7 @@ static int rk_mipi_screen_init_dt(struct mipi_screen *screen)
        struct list_head *pos;
        struct property *prop;
        enum of_gpio_flags flags;
-       u32 value, i, debug, gpio, ret, cmds[25], length;
+       u32 value, i, debug, gpio, ret, cmds[128], length;

然后屏幕就可以正常点亮了

完整补丁：

diff --git a/kernel/arch/arm/boot/dts/mc-screen.dtsi b/kernel/arch/arm/boot/dts/mc-screen.dtsi
index c3f6a59c7c..d8c3ffa36f 100644
--- a/kernel/arch/arm/boot/dts/mc-screen.dtsi
+++ b/kernel/arch/arm/boot/dts/mc-screen.dtsi
@@ -1362,7 +1362,7 @@
         dsi,format = <MIPI_DSI_FMT_RGB888>;
         dsi,lanes = <4>;
         reset-delay-ms = <20>;
-        //init-delay-ms = <20>;
+        init-delay-ms = <200>;
         enable-delay-ms = <120>;
         prepare-delay-ms = <120>;
         status = "disabled";
@@ -1370,38 +1370,57 @@
 		panel-read-sequence = [];
 
 		panel-init-sequence = [
-			15 00 02 80 48
-			15 00 02 81 B8
-			15 00 02 82 88
-			15 00 02 83 88
-			15 00 02 84 58
-			15 00 02 85 D2
-			15 00 02 86 88
-			15 78 02 11 00 
-			15 32 02 29 00
+			39 00 03 E0 AB BA
+			39 00 03 E1 BA AB
+			39 00 05 B1 10 01 47 FF
+			39 00 07 B2 0C 14 04 50 50 14
+			39 00 04 B3 56 D3 00
+			39 00 04 B4 33 20 04
+			39 00 08 B6 B0 00 00 10 00 10 00
+			39 00 06 B8 56 12 29 29 48
+			39 00 27 B9 7C 66 57 4C 49 3C 42 2E 48 47 48 66 54 5B 4D 4A 3D 27 06 7C 66 57 4C 49 3C 42 2E 48 47 48 66 54 5B 4D 4A 3D 27 06
+			39 00 11 C0 32 23 67 67 33 33 33 33 10 04 88 04 3F 00 00 C0
+			39 00 0B C1 13 14 02 08 10 04 7D 04 54 00
+			39 00 0D C2 37 09 08 89 88 21 22 21 44 BB 18 00
+			39 00 17 C3 89 64 24 05 1F 1E 02 15 17 02 0D 0F 02 11 13 07 02 02 02 02 02 02
+			39 00 17 C4 08 24 24 04 1F 1E 02 14 16 02 0C 0E 02 10 12 06 02 02 02 02 02 02
+			39 00 03 C6 22 22
+			39 00 07 C8 21 00 32 40 54 16
+			39 00 03 CA CB 43
+			39 00 09 CD 0E 4F 4F 25 1E 6B 06 B3
+			39 00 05 D2 E3 2B 38 00
+			39 00 0C D4 00 01 00 0E 04 44 08 10 00 07 00
+			39 00 09 E6 80 01 FF FF FF FF FF FF
+			39 00 06 F0 12 03 20 00 FF
+			05 FF 01 11
+        	05 64 01 29
 		];
 
 		panel-exit-sequence = [
-			05 00 01 28 
-			05 78 01 10 
+		    05 00 01 28
+	        05 78 01 10
 		];
 
 		display-timings {
 			native-mode = <&timing_mipi_7_inch>;
 			timing_mipi_7_inch: timing_mipi_7_inch {
-                clock-frequency = <56500000>;
-                hactive = <1024>;
-                vactive = <600>;
-                hsync-len = <10>;
-                hback-porch = <160>;
-                hfront-porch = <160>;
-                vsync-len = <1>;
-                vback-porch = <24>;
-                vfront-porch = <12>;
+				clock-frequency = <77000000>;
+
+                hactive = <800>;
+                vactive = <1280>;
+
+               	hsync-len = <20>;
+				hback-porch = <80>;
+				hfront-porch = <80>;
+
+				vsync-len = <4>;
+				vback-porch = <12>;
+				vfront-porch = <20>;
+
                 hsync-active = <0>;
                 vsync-active = <0>;
                 de-active = <0>;
-                pixelclk-active = <0>;                 
+                pixelclk-active = <0>;
             };
 		};
 	};
diff --git a/u-boot/drivers/mc/screen/screen_adapter.c b/u-boot/drivers/mc/screen/screen_adapter.c
index b742fafb84..d6404f1a8f 100644
--- a/u-boot/drivers/mc/screen/screen_adapter.c
+++ b/u-boot/drivers/mc/screen/screen_adapter.c
@@ -77,7 +77,7 @@ static screen screen_list[] = {
      * MIPI-DSI Panel
      */
     {AUTO_MIPI_10_1_INCH, NULL, 0x00, NULL, NULL, NONE, 0x00, NULL, screen_set_panel_mipi_dsi},
-	{AUTO_MIPI_7_INCH, PANEL7_PATH, 400, NULL, NULL, NONE, 0x00, NULL, screen_set_panel_mipi_dsi},
+    {AUTO_MIPI_7_INCH, PANEL7_PATH, 580, NULL, NULL, NONE, 0x00, NULL, screen_set_panel_mipi_dsi},
 
     /**
      * eDP Panel
diff --git a/u-boot/drivers/video/rockchip_dsi_panel.c b/u-boot/drivers/video/rockchip_dsi_panel.c
index 5081d3dc5c..a1461a8b8d 100644
--- a/u-boot/drivers/video/rockchip_dsi_panel.c
+++ b/u-boot/drivers/video/rockchip_dsi_panel.c
@@ -176,8 +176,10 @@ static int rockchip_dsi_panel_send_cmds(struct display_state *state,
 		if (ret)
 			printf("failed to write cmd%d: %d\n", i, ret);
 
-		if (cmds->cmds[i].dchdr.wait)
-			msleep(cmds->cmds[i].dchdr.wait);
+        if (cmds->cmds[i].dchdr.wait){
+                msleep(cmds->cmds[i].dchdr.wait);
+        }
+			
 	}
 
 	return 0;
diff --git a/u-boot/drivers/video/screen/lcd_mipi.c b/u-boot/drivers/video/screen/lcd_mipi.c
index cc0d215bdd..a4073e332a 100755
--- a/u-boot/drivers/video/screen/lcd_mipi.c
+++ b/u-boot/drivers/video/screen/lcd_mipi.c
@@ -307,7 +307,7 @@ static int rk_mipi_screen_init_dt(struct mipi_screen *screen)
 	struct list_head *pos;
 	struct property *prop;
 	enum of_gpio_flags flags;
-	u32 value, i, debug, gpio, ret, cmds[25], length;
+	u32 value, i, debug, gpio, ret, cmds[128], length;
 
 	memset(screen, 0, sizeof(*screen));