请问一下怎样对RK3288[android 7.1]的mipi屏进行调试呢

1 找到 在要编译的rk3288-evb-android-rk808-edp.dts

加入以下mipi dts配置：

/dts-v1/;

#include "rk3288-evb.dtsi"

#include "rk3288-android.dtsi"

#include #include #include 。。。。。。。。

// added for mipi dsi start <<<

&dsi0 {

status = "okay";

rockchip,lane-rate = <420>;

panel: panel {

status = "okay";

compatible = "simple-panel-dsi";

reg = <0>;

backlight = ;

//由于我们项目中有两个1V8和3V3的使能引脚，所以要配置

3v3_gpio = ;//3v3使能引脚

enable = ; //1V8使能引脚

reset = ;//复位引脚

dsi,flags = ;

dsi,format = ;

bus-format = ;

dsi,lanes = <4>;

//dsi,channel = <1>;

reset-delay-ms = <30>;

init-delay-ms = <120>;

enable-delay-ms = <30>;

prepare-delay-ms = <30>;

unprepare-delay-ms = <30>;

panel-init-sequence = [ //此部分初始化命令一定要正确，此部分命令可找fae要

15 00 02 E0 00

//15:表示DCS 命 令 的 类 型，其长度等于2,

// 00:表示 发送完该命令以后需要延时的时间，单位为 ms

//02:表示命令 payload 的长度

//E0 00 表示实际发送的 payload命令 其中 E0代表要发送的寄存器地址，00代表往0xe0写入的数据

15 00 02 E1 93

15 00 02 E2 65

15 00 02 E3 F8

15 00 02 E0 00

15 00 02 70 02

15 00 02 71 23

15 00 02 72 06

15 00 02 80 03

15 00 02 E6 02

15 00 02 E7 02

15 00 02 E0 01

15 00 02 00 00

15 00 02 01 A0

15 00 02 03 00

15 00 02 04 A0

15 00 02 17 00

15 00 02 18 B1

15 00 02 19 00

15 00 02 1A 00

15 00 02 1B B1

15 00 02 1C 00

15 00 02 1F 3E

15 00 02 20 2D

15 00 02 21 2D

15 00 02 22 0E

15 00 02 37 19

15 00 02 38 05

15 00 02 39 08

15 00 02 3A 12

15 00 02 3C 78

15 00 02 3E 80

15 00 02 3F 80

15 00 02 40 06

15 00 02 41 A0

//15 00 02 4A 35 // test mode on

15 00 02 55 0F

15 00 02 56 01

15 00 02 57 69

15 00 02 58 0A

15 00 02 59 0A

15 00 02 5A 28

15 00 02 5B 19

15 00 02 5D 7C

15 00 02 5E 5E

15 00 02 5F 4E

15 00 02 60 41

15 00 02 61 3F

15 00 02 62 31

15 00 02 63 37

15 00 02 64 23

15 00 02 65 3E

15 00 02 66 3F

15 00 02 67 40

15 00 02 68 5E

15 00 02 69 4F

15 00 02 6A 57

15 00 02 6B 4B

15 00 02 6C 49

15 00 02 6D 2F

15 00 02 6E 03

15 00 02 6F 00

15 00 02 70 7C

15 00 02 71 5E

15 00 02 72 4E

15 00 02 73 41

15 00 02 74 3F

15 00 02 75 31

15 00 02 76 37

15 00 02 77 23

15 00 02 78 3E

15 00 02 79 3F

15 00 02 7A 40

15 00 02 7B 5E

15 00 02 7C 4F

15 00 02 7D 57

15 00 02 7E 4B

15 00 02 7F 49

15 00 02 80 2F

15 00 02 81 03

15 00 02 82 00

15 00 02 E0 02

15 00 02 00 47

15 00 02 01 47

15 00 02 02 45

15 00 02 03 45

15 00 02 04 4B

15 00 02 05 4B

15 00 02 06 49

15 00 02 07 49

15 00 02 08 41

15 00 02 09 1F

15 00 02 0A 1F

15 00 02 0B 1F

15 00 02 0C 1F

15 00 02 0D 1F

15 00 02 0E 1F

15 00 02 0F 43

15 00 02 10 1F

15 00 02 11 1F

15 00 02 12 1F

15 00 02 13 1F

15 00 02 14 1F

15 00 02 15 1F

15 00 02 16 46

15 00 02 17 46

15 00 02 18 44

15 00 02 19 44

15 00 02 1A 4A

15 00 02 1B 4A

15 00 02 1C 48

15 00 02 1D 48

15 00 02 1E 40

15 00 02 1F 1F

15 00 02 20 1F

15 00 02 21 1F

15 00 02 22 1F

15 00 02 23 1F

15 00 02 24 1F

15 00 02 25 42

15 00 02 26 1F

15 00 02 27 1F

15 00 02 28 1F

15 00 02 29 1F

15 00 02 2A 1F

15 00 02 2B 1F

15 00 02 58 10

15 00 02 59 00

15 00 02 5A 00

15 00 02 5B 30

15 00 02 5C 03

15 00 02 5D 30

15 00 02 5E 01

15 00 02 5F 02

15 00 02 60 30

15 00 02 61 01

15 00 02 62 02

15 00 02 63 04

15 00 02 64 7F

15 00 02 65 05

15 00 02 66 12

15 00 02 67 73

15 00 02 68 05

15 00 02 69 04

15 00 02 6A 7F

15 00 02 6B 09

15 00 02 6C 00

15 00 02 6D 04

15 00 02 6E 04

15 00 02 6F 88

15 00 02 70 00

15 00 02 71 00

15 00 02 72 06

15 00 02 73 7B

15 00 02 74 00

15 00 02 75 3C

15 00 02 76 00

15 00 02 77 0D

15 00 02 78 2C

15 00 02 79 00

15 00 02 7A 00

15 00 02 7B 00

15 00 02 7C 00

15 00 02 7D 03

15 00 02 7E 7B

15 00 02 E0 01

15 00 02 0E 01

15 00 02 E0 03

15 00 02 98 2F

15 00 02 E0 04

15 00 02 2B 2B

15 00 02 2E 44

15 00 02 09 10

15 00 02 2D 03

15 00 02 E0 00

05 78 01 11

05 32 01 29

//05:表示DCS 命 令 的 类 型，其长度等于1,还有一个39表示这是一个 DCS 长包命令，payload 长度大于 2。

];

panel-exit-sequence = [

05 16 01 28

05 78 01 10

];

display-timings {

native-mode = ;

timing0: timing0 {

clock-frequency = <67000000>;

hactive = <800>;

vactive = <1280>;

hback-porch = <10>;

hfront-porch = <42>;

hsync-len = <20>;

vback-porch = <4>;

vfront-porch = <8>;

vsync-len = <4>;

hsync-active = <0>;

vsync-active = <0>;

de-active = <0>;

pixelclk-active = <0>;

};

};

};

};

&route_dsi0 {

status = "okay";

};

&dsi0_in_vopb {

status = "okay";

};

&dsi0_in_vopl {

status = "disabled";

};

// added mipi dsi end

。。。。。。。。。。。。。。

注：由原理图可以知道1v8使能引脚是GPIO5_B5(gpio5 13)和3v3使能引脚是GPIO0_B5(gpio0 13)， reset引脚是GPIO7_A4(gpio7 4)

  

  



  

  

在驱动中增加3v3使能引脚的配置，注意3v3使能引脚是低电平有效

diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c

old mode 100644

new mode 100755

index daf891c..adbdc7d

--- a/drivers/gpu/drm/panel/panel-simple.c

+++ b/drivers/gpu/drm/panel/panel-simple.c

//增加3v3gpio

@@ -114,6 +114,7 @@ struct panel_simple {

struct gpio_desc *enable_gpio;

struct gpio_desc *reset_gpio;

+ struct gpio_desc *vdd3_3_gpio;

int cmd_type;

struct gpio_desc *spi_sdi_gpio;

//掉电时序 3v3使能引脚是低电平有效，空闲电平是高电平

@@ -603,6 +611,8 @@ static int panel_simple_unprepare(struct drm_panel *panel)

if (p->enable_gpio)

gpiod_direction_output(p->enable_gpio, 0);

+ if (p->vdd3_3_gpio)

+ gpiod_direction_output(p->vdd3_3_gpio, 1);

panel_simple_regulator_disable(panel);

//上电时序 3v3使能引脚是低电平有效，空闲电平是高电平

@@ -630,6 +641,8 @@ static int panel_simple_prepare(struct drm_panel *panel)

if (p->enable_gpio)

gpiod_direction_output(p->enable_gpio, 1);

+ if (p->vdd3_3_gpio)

+ gpiod_direction_output(p->vdd3_3_gpio, 0);

if (p->desc && p->desc->delay.prepare)

msleep(p->desc->delay.prepare);

return -ENOMEM;

//3v3_gpio的dts

@@ -799,6 +818,12 @@ static int panel_simple_probe(struct device *dev, const struct panel_desc *desc)

dev_err(dev, "failed to request enable GPIO: %dn", err);

return err;

}

+ panel->vdd3_3_gpio = devm_gpiod_get_optional(dev, "3v3_gpio", 0);

+ if (IS_ERR(panel->vdd3_3_gpio)) {

+ err = PTR_ERR(panel->vdd3_3_gpio);

+ dev_err(dev, "failed to request vdd3_3_gpio GPIO: %dn", err);

+ return err;

+ }

panel->reset_gpio = devm_gpiod_get_optional(dev, "reset", 0);

if (IS_ERR(panel->reset_gpio)) {

//关机函数，3v3使能引脚是低电平有效，空闲电平是高电平

@@ -935,6 +963,8 @@ static void panel_simple_shutdown(struct device *dev)

if (panel->enable_gpio)

gpiod_direction_output(panel->enable_gpio, 0);

+ if (panel->vdd3_3_gpio)

+ gpiod_direction_output(panel->vdd3_3_gpio, 1);

panel_simple_regulator_disable(&panel->base);

}

2.编译kernel,烧写固件，绑定mipi成功会有以下log出现

Line 618: [ 0.923158] rockchip-drm display-subsystem: bound ff960000.dsi (ops dw_mipi_dsi_ops)

Line 619: [ 0.923170] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).

在rk3288.dtsi中可以知道mipi地址是 ff960000

。。。。。。。。

dsi0: dsi@ff960000 {

compatible = "rockchip,rk3288-mipi-dsi", "snps,dw-mipi-dsi";

reg = <0x0 0xff960000 0x0 0x4000>;

interrupts = ;

clocks = , ;

clock-names = "ref", "pclk";

resets = ;

reset-names = "apb";

power-domains = ;

rockchip,grf = ;

#address-cells = <1>;

#size-cells = <0>;

status = "disabled";

ports {

#address-cells = <1>;

#size-cells = <0>;

dsi0_in: port {

#address-cells = <1>;

#size-cells = <0>;

dsi0_in_vopb: endpoint@0 {

reg = <0>;

remote-endpoint = ;

};

dsi0_in_vopl: endpoint@1 {

reg = <1>;

remote-endpoint = ;

};

};

};

};