20240606在Toybrick的TB-RK3588开发板的Android12下确认HDMI的驱动

20240606在Toybrick的TB-RK3588开发板的Android12下确认HDMI的驱动
2024/6/6 9:48

【原文是在RK3328的Android7.1下写的。我将它升级成为RK3588的Android12了】
RK平台主要采用 FB 和 DRM 两种显示框架。与此相对应， HDMI 也有两套驱动。
FB：
LINUX 3.10 内核主要采用传统的 FB 框架， HDMI 驱动的路径为：
kernel/drivers/video/rockchip/hdmi/

DRM：
DRM全称是 Direct Rendering Manager 是 DRI ( Direct Rendering Infrastructure ) 框架的一个
组件。LINUX 4.4/4.19 内核采用 DRM框架， HDMI 驱动的路径为：
kernel/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
kernel/drivers/gpu/drm/bridge/synopsys/

Y:\android12-rk-outside\kernel-5.10\drivers\gpu\drm\bridge\synopsys\dw-hdmi.c
Y:\android12-rk-outside\kernel-5.10\drivers\gpu\drm\drm_edid.c
Y:\android12-rk-outside\kernel-5.10\drivers\gpu\drm\rockchip\dw_hdmi-rockchip.c

RK3288_Android7.1内核为4.4，采用的DRM框架。
RK3588_Android12内核为linux-5.10，采用的DRM框架。本文只分析DRM框架下hdmi相关功能调试。
1.HDMI 软件功能配置
1.1 使能HDMI
&hdmi {
status = "okay";
};

Y:\android12-rk-outside\kernel-5.10\arch\arm64\boot\dts\rockchip\rk3588-toybrick-x0.dtsi
Z:\rk3588-toybrick-x0-linux20240508\kernel\arch\arm64\boot\dts\rockchip\rk3588-toybrick-x0.dtsi
&hdmi0 {
enable-gpios = <&gpio4 RK_PB1 GPIO_ACTIVE_HIGH>;
status = "okay";
};

&hdmi0_in_vp0 {
status = "okay";
};

&hdmi0_sound {
status = "okay";
};

/* Should work with at least 128MB cma reserved above. */
&hdmirx_ctrler {
status = "okay";

   /* Effective level used to trigger HPD: 0-low, 1-high */
   hpd-trigger-level = <1>;
   hdmirx-det-gpios = <&gpio2 RK_PB5 GPIO_ACTIVE_LOW>;
   pinctrl-names = "default";
   pinctrl-0 = <&hdmim1_rx &hdmirx_det>;
};

&hdptxphy_hdmi0 {
status = "okay";
};

1.2 绑定VOP
RK3288平台存在两个 VOP：VOPB（支持 4K）、VOPL（只支持 2K），两个 VOP
可以分别与两个显示接口绑定（一个显示接口只能和一个 VOP 绑定），且可以相互交换：

当 dts 中显示设备节点打开时，显示接口对应 VOPB和 VOPL 的 ports 都会打开，所以需要关闭用不到的那个 VOP。比如 HDMI 绑定到 VOPB 需要添加：

&hdmi_in_vopl {
status = "disabled";
};

反之若绑定到 VOPL 则添加：

&hdmi_in_vopb {
status = "disabled";
};

对于RK3588平台，有所修正：
&hdmi0_in_vp0 {
status = "okay";
};

1.3 打开开机logo
如果 U-Boot logo 未开启，那 kernel 阶段也无法显示开机 logo，只能等到系统启动后才能看到显示。
在 dts 里面将 route_hdmi 使能即可打开 U-Boot logo 支持:

&route_hdmi {
status = "okay"
};

【可能我对U-Boot的理解不同，对于我用的HDMI显示器。大概7秒钟，Buildroot直接进界面，Android显示ANDROID画面，打印都过了U-boot阶段】
对于RK3588平台：
rootroot@rootroot-desktop:~/android12-rk-outside/kernel-5.10/arch/arm64/boot/dts/rockchip$
rootroot@rootroot-desktop:~/android12-rk-outside/kernel-5.10/arch/arm64/boot/dts/rockchip$ grep route_hdmi . -R
./.rk3588-toybrick-x0-android.dtb.dts.tmp: route_hdmi0: route-hdmi0 {
./.rk3588-toybrick-x0-android.dtb.dts.tmp: route_hdmi1: route-hdmi1 {
./rk3588.dtsi: route_hdmi1: route-hdmi1 {
./rk3588s.dtsi: route_hdmi0: route-hdmi0 {
Binary file ./rk3588-toybrick-x0-android.dtb matches
rootroot@rootroot-desktop:~/android12-rk-outside/kernel-5.10/arch/arm64/boot/dts/rockchip$

Y:\android12-rk-outside\kernel-5.10\arch\arm64\boot\dts\rockchip\rk3588s.dtsi

// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
/*
* Copyright (c) 2021 Rockchip Electronics Co., Ltd.
*/

#include <dt-bindings/clock/rk3588-cru.h>
#include <dt-bindings/interrupt-controller/arm-gic.h>
#include <dt-bindings/interrupt-controller/irq.h>
#include <dt-bindings/phy/phy.h>
#include <dt-bindings/power/rk3588-power.h>
#include <dt-bindings/soc/rockchip,boot-mode.h>
#include <dt-bindings/soc/rockchip-system-status.h>
#include <dt-bindings/suspend/rockchip-rk3588.h>
#include <dt-bindings/thermal/thermal.h>

/ {
compatible = "rockchip,rk3588";

   interrupt-parent = <&gic>;
   #address-cells = <2>;
   #size-cells = <2>;

   display_subsystem: display-subsystem {
       compatible = "rockchip,display-subsystem";
       ports = <&vop_out>;

       route {
           route_dp0: route-dp0 {
               status = "disabled";
               logo,uboot = "logo.bmp";
               logo,kernel = "logo_kernel.bmp";
               logo,mode = "center";
               charge_logo,mode = "center";
               connect = <&vp1_out_dp0>;
           };

           route_dsi0: route-dsi0 {
               status = "disabled";
               logo,uboot = "logo.bmp";
               logo,kernel = "logo_kernel.bmp";
               logo,mode = "center";
               charge_logo,mode = "center";
               connect = <&vp3_out_dsi0>;
           };

           route_dsi1: route-dsi1 {
               status = "disabled";
               logo,uboot = "logo.bmp";
               logo,kernel = "logo_kernel.bmp";
               logo,mode = "center";
               charge_logo,mode = "center";
               connect = <&vp3_out_dsi1>;
           };

           route_edp0: route-edp0 {
               status = "disabled";
               logo,uboot = "logo.bmp";
               logo,kernel = "logo_kernel.bmp";
               logo,mode = "center";
               charge_logo,mode = "center";
               connect = <&vp2_out_edp0>;
           };

           route_edp1: route-edp1 {
               status = "disabled";
               logo,uboot = "logo.bmp";
               logo,kernel = "logo_kernel.bmp";
               logo,mode = "center";
               charge_logo,mode = "center";
           };

           route_hdmi0: route-hdmi0 {
               status = "disabled";
               logo,uboot = "logo.bmp";
               logo,kernel = "logo_kernel.bmp";
               logo,mode = "center";
               charge_logo,mode = "center";
               connect = <&vp0_out_hdmi0>;
           };

           route_rgb: route-rgb {
               status = "disabled";
               logo,uboot = "logo.bmp";
               logo,kernel = "logo_kernel.bmp";
               logo,mode = "center";
               charge_logo,mode = "center";
               connect = <&vp3_out_rgb>;
           };
       };
   };

   hdmi0: hdmi@fde80000 {
       compatible = "rockchip,rk3588-dw-hdmi";
       reg = <0x0 0xfde80000 0x0 0x20000>;
       interrupts = <GIC_SPI 169 IRQ_TYPE_LEVEL_HIGH>,
           <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
           <GIC_SPI 171 IRQ_TYPE_LEVEL_HIGH>,
           <GIC_SPI 172 IRQ_TYPE_LEVEL_HIGH>,
           <GIC_SPI 360 IRQ_TYPE_LEVEL_HIGH>;
       clocks = <&cru PCLK_HDMITX0>,
           <&cru CLK_HDMIHDP0>,
           <&cru CLK_HDMITX0_EARC>,
           <&cru CLK_HDMITX0_REF>,
           <&cru MCLK_I2S5_8CH_TX>,
           <&cru DCLK_VOP0>,
           <&cru DCLK_VOP1>,
           <&cru DCLK_VOP2>,
           <&cru DCLK_VOP3>,
           <&hclk_vo1>,
           <&hdptxphy_hdmi_clk0>;
       clock-names = "pclk",
           "hpd",
           "earc",
           "hdmitx_ref",
           "aud",
           "dclk_vp0",
           "dclk_vp1",
           "dclk_vp2",
           "dclk_vp3",
           "hclk_vo1",
           "link_clk";
       resets = <&cru SRST_HDMITX0_REF>, <&cru SRST_HDMIHDP0>;
       reset-names = "ref", "hdp";
       power-domains = <&power RK3588_PD_VO1>;
       pinctrl-names = "default";
       pinctrl-0 = <&hdmim0_tx0_cec &hdmim0_tx0_hpd &hdmim0_tx0_scl &hdmim0_tx0_sda>;
       reg-io-width = <4>;
       rockchip,grf = <&sys_grf>;
       rockchip,vo1_grf = <&vo1_grf>;
       phys = <&hdptxphy_hdmi0>;
       phy-names = "hdmi";
       #sound-dai-cells = <0>;
       status = "disabled";

       ports {
           #address-cells = <1>;
           #size-cells = <0>;

           hdmi0_in: port@0 {
               reg = <0>;
               #address-cells = <1>;
               #size-cells = <0>;

               hdmi0_in_vp0: endpoint@0 {
                   reg = <0>;
                   remote-endpoint = <&vp0_out_hdmi0>;
                   status = "disabled";
               };

               hdmi0_in_vp1: endpoint@1 {
                   reg = <1>;
                   remote-endpoint = <&vp1_out_hdmi0>;
                   status = "disabled";
               };

               hdmi0_in_vp2: endpoint@2 {
                   reg = <2>;
                   remote-endpoint = <&vp2_out_hdmi0>;
                   status = "disabled";
               };
           };
       };
   };
};

#include "rk3588s-pinctrl.dtsi"

Y:\android12-rk-outside\kernel-5.10\arch\arm64\boot\dts\rockchip\rk3588.dtsi

// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
/*
* Copyright (c) 2021 Rockchip Electronics Co., Ltd.
*/

#include <dt-bindings/phy/phy-snps-pcie3.h>
#include "rk3588s.dtsi"
#include "rk3588-vccio3-pinctrl.dtsi"

/ {
   aliases {
       csi2dphy3 = &csi2_dphy3;
       csi2dphy4 = &csi2_dphy4;
       csi2dphy5 = &csi2_dphy5;
       dp0 = &dp0;
       dp1 = &dp1;
       edp0 = &edp0;
       edp1 = &edp1;
       ethernet0 = &gmac0;
       hdptx0 = &hdptxphy0;
       hdptx1 = &hdptxphy1;
       hdptxhdmi0 = &hdptxphy_hdmi0;
       hdptxhdmi1 = &hdptxphy_hdmi1;
       hdmi0 = &hdmi0;
       hdmi1 = &hdmi1;
       hdmirx0 = &hdmirx_ctrler;
       rkcif_mipi_lvds4= &rkcif_mipi_lvds4;
       rkcif_mipi_lvds5= &rkcif_mipi_lvds5;
       usbdp0 = &usbdp_phy0;
       usbdp1 = &usbdp_phy1;
   };

   hdmi1: hdmi@fdea0000 {
       compatible = "rockchip,rk3588-dw-hdmi";
       reg = <0x0 0xfdea0000 0x0 0x20000>;
       interrupts = <GIC_SPI 173 IRQ_TYPE_LEVEL_HIGH>,
           <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>,
           <GIC_SPI 175 IRQ_TYPE_LEVEL_HIGH>,
           <GIC_SPI 176 IRQ_TYPE_LEVEL_HIGH>,
           <GIC_SPI 361 IRQ_TYPE_LEVEL_HIGH>;
       clocks = <&cru PCLK_HDMITX1>,
           <&cru CLK_HDMIHDP1>,
           <&cru CLK_HDMITX1_EARC>,
           <&cru CLK_HDMITX1_REF>,
           <&cru MCLK_I2S6_8CH_TX>,
           <&cru DCLK_VOP0>,
           <&cru DCLK_VOP1>,
           <&cru DCLK_VOP2>,
           <&cru DCLK_VOP3>,
           <&hclk_vo1>,
           <&hdptxphy_hdmi_clk1>;
       clock-names = "pclk",
           "hpd",
           "earc",
           "hdmitx_ref",
           "aud",
           "dclk_vp0",
           "dclk_vp1",
           "dclk_vp2",
           "dclk_vp3",
           "hclk_vo1",
           "link_clk";
       resets = <&cru SRST_HDMITX1_REF>, <&cru SRST_HDMIHDP1>;
       reset-names = "ref", "hdp";
       power-domains = <&power RK3588_PD_VO1>;
       pinctrl-names = "default";
       pinctrl-0 = <&hdmim2_tx1_cec &hdmim0_tx1_hpd &hdmim1_tx1_scl &hdmim1_tx1_sda>;
       reg-io-width = <4>;
       rockchip,grf = <&sys_grf>;
       rockchip,vo1_grf = <&vo1_grf>;
       phys = <&hdptxphy_hdmi1>;
       phy-names = "hdmi";
       #sound-dai-cells = <0>;
       status = "disabled";

       ports {
           #address-cells = <1>;
           #size-cells = <0>;

           hdmi1_in: port@0 {
               reg = <0>;
               #address-cells = <1>;
               #size-cells = <0>;

               hdmi1_in_vp0: endpoint@0 {
                   reg = <0>;
                   remote-endpoint = <&vp0_out_hdmi1>;
                   status = "disabled";
               };

               hdmi1_in_vp1: endpoint@1 {
                   reg = <1>;
                   remote-endpoint = <&vp1_out_hdmi1>;
                   status = "disabled";
               };

               hdmi1_in_vp2: endpoint@2 {
                   reg = <2>;
                   remote-endpoint = <&vp2_out_hdmi1>;
                   status = "disabled";
               };
           };
       };
   };

   hdptxphy1: phy@fed70000 {
       compatible = "rockchip,rk3588-hdptx-phy";
       reg = <0x0 0xfed70000 0x0 0x2000>;
       clocks = <&cru CLK_USB2PHY_HDPTXRXPHY_REF>, <&cru PCLK_HDPTX1>;
       clock-names = "ref", "apb";
       resets = <&cru SRST_P_HDPTX1>, <&cru SRST_HDPTX1_INIT>,
           <&cru SRST_HDPTX1_CMN>, <&cru SRST_HDPTX1_LANE>;
       reset-names = "apb", "init", "cmn", "lane";
       rockchip,grf = <&hdptxphy1_grf>;
       #phy-cells = <0>;
       status = "disabled";
   };

   hdptxphy_hdmi1: hdmiphy@fed70000 {
       compatible = "rockchip,rk3588-hdptx-phy-hdmi";
       reg = <0x0 0xfed70000 0x0 0x2000>;
       clocks = <&cru CLK_USB2PHY_HDPTXRXPHY_REF>, <&cru PCLK_HDPTX1>;
       clock-names = "ref", "apb";
       resets = <&cru SRST_HDPTX1>, <&cru SRST_P_HDPTX1>,
           <&cru SRST_HDPTX1_INIT>, <&cru SRST_HDPTX1_CMN>,
           <&cru SRST_HDPTX1_LANE>, <&cru SRST_HDPTX1_ROPLL>,
           <&cru SRST_HDPTX1_LCPLL>;
       reset-names = "phy", "apb", "init", "cmn", "lane", "ropll",
           "lcpll";
       rockchip,grf = <&hdptxphy1_grf>;
       #phy-cells = <0>;
       status = "disabled";

       hdptxphy_hdmi_clk1: clk-port {
           #clock-cells = <0>;
           status = "okay";
       };
   };
};

1.4 新增特殊分辨率
DRM 框架目前代码已经支持了绝大部分分辨率时序，但是部分 HDMI 屏幕旋转的场景下，可能还有一些特殊分辨率不支持。需要在 kernel\drivers\gpu\drm\drm_edid.c 中的 drm_dmt_modes 当末尾新增：

/* 0x58 - 4096x2160@59.94Hz RB */
{ DRM_MODE("4096x2160", DRM_MODE_TYPE_DRIVER, 556188, 4096, 4104,
4136, 4176, 0, 2160, 2208, 2216, 2222, 0,
DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC) },

参数   说明
4096x2160   mode name，为分辨率的 hdisplay*vdisplay
DRM_MODE_TYPE_DRIVER   mode type，配置为DRM_MODE_TYPE_DRIVER
556188   像素时钟
4096   行有效像素
4104   行同步起始像素
4136   行同步结束像素
4176   一行总像素
0   hskew，通常为 0
2160   帧有效行
2208   帧同步开始行
2216   帧同步结束行
2222   一帧总行数
0   vscan，通常为 0
vrefresh   显示设备帧率
DRM_MODE_FLAG_PHSYNC I DRM_MODE_FLAG_NVSYNC   hsync 和 vsync 极性，flags 的定义如下：DRM_MODE_FLAG_PHSYNC (1<<0) DRM_MODE_FLAG_NHSYNC (1<<1) DRM_MODE_FLAG_PVSYNC (1<<2) DRM_MODE_FLAG_NVSYNC (1<<3) DRM_MODE_FLAG_INTERLACE (1<<4)

Y:\android12-rk-outside\kernel-5.10\drivers\gpu\drm\drm_edid.c

/*
* Autogenerated from the DMT spec.
* This table is copied from xfree86/modes/xf86EdidModes.c.
*/
static const struct drm_display_mode drm_dmt_modes[] = {
   /* 0x01 - 640x350@85Hz */
   { DRM_MODE("640x350", DRM_MODE_TYPE_DRIVER, 31500, 640, 672,
       736, 832, 0, 350, 382, 385, 445, 0,
       DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC) },
   /* 0x02 - 640x400@85Hz */
   { DRM_MODE("640x400", DRM_MODE_TYPE_DRIVER, 31500, 640, 672,
       736, 832, 0, 400, 401, 404, 445, 0,
       DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC) },
   /* 0x03 - 720x400@85Hz */
   { DRM_MODE("720x400", DRM_MODE_TYPE_DRIVER, 35500, 720, 756,
       828, 936, 0, 400, 401, 404, 446, 0,
       DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC) },
   /* 0x04 - 640x480@60Hz */
   { DRM_MODE("640x480", DRM_MODE_TYPE_DRIVER, 25175, 640, 656,
       752, 800, 0, 480, 490, 492, 525, 0,
       DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) },
   /* 0x05 - 640x480@72Hz */
   { DRM_MODE("640x480", DRM_MODE_TYPE_DRIVER, 31500, 640, 664,
       704, 832, 0, 480, 489, 492, 520, 0,
       DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) },
   /* 0x06 - 640x480@75Hz */
   { DRM_MODE("640x480", DRM_MODE_TYPE_DRIVER, 31500, 640, 656,
       720, 840, 0, 480, 481, 484, 500, 0,
       DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) },
   /* 0x07 - 640x480@85Hz */
   { DRM_MODE("640x480", DRM_MODE_TYPE_DRIVER, 36000, 640, 696,
       752, 832, 0, 480, 481, 484, 509, 0,
       DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) },
   /* 0x08 - 800x600@56Hz */
   { DRM_MODE("800x600", DRM_MODE_TYPE_DRIVER, 36000, 800, 824,
       896, 1024, 0, 600, 601, 603, 625, 0,
       DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) },
   /* 0x09 - 800x600@60Hz */
   { DRM_MODE("800x600", DRM_MODE_TYPE_DRIVER, 40000, 800, 840,
       968, 1056, 0, 600, 601, 605, 628, 0,
       DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) },
   /* 0x0a - 800x600@72Hz */
   { DRM_MODE("800x600", DRM_MODE_TYPE_DRIVER, 50000, 800, 856,
       976, 1040, 0, 600, 637, 643, 666, 0,
       DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) },
   /* 0x0b - 800x600@75Hz */
   { DRM_MODE("800x600", DRM_MODE_TYPE_DRIVER, 49500, 800, 816,
       896, 1056, 0, 600, 601, 604, 625, 0,
       DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) },
   /* 0x0c - 800x600@85Hz */
   { DRM_MODE("800x600", DRM_MODE_TYPE_DRIVER, 56250, 800, 832,
       896, 1048, 0, 600, 601, 604, 631, 0,
       DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) },
   /* 0x0d - 800x600@120Hz RB */
   { DRM_MODE("800x600", DRM_MODE_TYPE_DRIVER, 73250, 800, 848,
       880, 960, 0, 600, 603, 607, 636, 0,
       DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC) },
   /* 0x0e - 848x480@60Hz */
   { DRM_MODE("848x480", DRM_MODE_TYPE_DRIVER, 33750, 848, 864,
       976, 1088, 0, 480, 486, 494, 517, 0,
       DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) },
   /* 0x0f - 1024x768@43Hz, interlace */
   { DRM_MODE("1024x768i", DRM_MODE_TYPE_DRIVER, 44900, 1024, 1032,
       1208, 1264, 0, 768, 768, 776, 817, 0,
       DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC |
       DRM_MODE_FLAG_INTERLACE) },
   /* 0x10 - 1024x768@60Hz */
   { DRM_MODE("1024x768", DRM_MODE_TYPE_DRIVER, 65000, 1024, 1048,
       1184, 1344, 0, 768, 771, 777, 806, 0,
       DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) },
   /* 0x11 - 1024x768@70Hz */
   { DRM_MODE("1024x768", DRM_MODE_TYPE_DRIVER, 75000, 1024, 1048,
       1184, 1328, 0, 768, 771, 777, 806, 0,
       DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) },
   /* 0x12 - 1024x768@75Hz */
   { DRM_MODE("1024x768", DRM_MODE_TYPE_DRIVER, 78750, 1024, 1040,
       1136, 1312, 0, 768, 769, 772, 800, 0,
       DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) },
   /* 0x13 - 1024x768@85Hz */
   { DRM_MODE("1024x768", DRM_MODE_TYPE_DRIVER, 94500, 1024, 1072,
       1168, 1376, 0, 768, 769, 772, 808, 0,
       DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) },
   /* 0x14 - 1024x768@120Hz RB */
   { DRM_MODE("1024x768", DRM_MODE_TYPE_DRIVER, 115500, 1024, 1072,
       1104, 1184, 0, 768, 771, 775, 813, 0,
       DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC) },
   /* 0x15 - 1152x864@75Hz */
   { DRM_MODE("1152x864", DRM_MODE_TYPE_DRIVER, 108000, 1152, 1216,
       1344, 1600, 0, 864, 865, 868, 900, 0,
       DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) },
   /* 0x55 - 1280x720@60Hz */
   { DRM_MODE("1280x720", DRM_MODE_TYPE_DRIVER, 74250, 1280, 1390,
       1430, 1650, 0, 720, 725, 730, 750, 0,
       DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) },
   /* 0x16 - 1280x768@60Hz RB */
   { DRM_MODE("1280x768", DRM_MODE_TYPE_DRIVER, 68250, 1280, 1328,
       1360, 1440, 0, 768, 771, 778, 790, 0,
       DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC) },
   /* 0x17 - 1280x768@60Hz */
   { DRM_MODE("1280x768", DRM_MODE_TYPE_DRIVER, 79500, 1280, 1344,
       1472, 1664, 0, 768, 771, 778, 798, 0,
       DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC) },
   /* 0x18 - 1280x768@75Hz */
   { DRM_MODE("1280x768", DRM_MODE_TYPE_DRIVER, 102250, 1280, 1360,
       1488, 1696, 0, 768, 771, 778, 805, 0,
       DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC) },
   /* 0x19 - 1280x768@85Hz */
   { DRM_MODE("1280x768", DRM_MODE_TYPE_DRIVER, 117500, 1280, 1360,
       1496, 1712, 0, 768, 771, 778, 809, 0,
       DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC) },
   /* 0x1a - 1280x768@120Hz RB */
   { DRM_MODE("1280x768", DRM_MODE_TYPE_DRIVER, 140250, 1280, 1328,
       1360, 1440, 0, 768, 771, 778, 813, 0,
       DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC) },
   /* 0x1b - 1280x800@60Hz RB */
   { DRM_MODE("1280x800", DRM_MODE_TYPE_DRIVER, 71000, 1280, 1328,
       1360, 1440, 0, 800, 803, 809, 823, 0,
       DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC) },
   /* 0x1c - 1280x800@60Hz */
   { DRM_MODE("1280x800", DRM_MODE_TYPE_DRIVER, 83500, 1280, 1352,
       1480, 1680, 0, 800, 803, 809, 831, 0,
       DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC) },
   /* 0x1d - 1280x800@75Hz */
   { DRM_MODE("1280x800", DRM_MODE_TYPE_DRIVER, 106500, 1280, 1360,
       1488, 1696, 0, 800, 803, 809, 838, 0,
       DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC) },
   /* 0x1e - 1280x800@85Hz */
   { DRM_MODE("1280x800", DRM_MODE_TYPE_DRIVER, 122500, 1280, 1360,
       1496, 1712, 0, 800, 803, 809, 843, 0,
       DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC) },
   /* 0x1f - 1280x800@120Hz RB */
   { DRM_MODE("1280x800", DRM_MODE_TYPE_DRIVER, 146250, 1280, 1328,
       1360, 1440, 0, 800, 803, 809, 847, 0,
       DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC) },
   /* 0x20 - 1280x960@60Hz */
   { DRM_MODE("1280x960", DRM_MODE_TYPE_DRIVER, 108000, 1280, 1376,
       1488, 1800, 0, 960, 961, 964, 1000, 0,
       DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) },
   /* 0x21 - 1280x960@85Hz */
   { DRM_MODE("1280x960", DRM_MODE_TYPE_DRIVER, 148500, 1280, 1344,
       1504, 1728, 0, 960, 961, 964, 1011, 0,
       DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) },
   /* 0x22 - 1280x960@120Hz RB */
   { DRM_MODE("1280x960", DRM_MODE_TYPE_DRIVER, 175500, 1280, 1328,
       1360, 1440, 0, 960, 963, 967, 1017, 0,
       DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC) },
   /* 0x23 - 1280x1024@60Hz */
   { DRM_MODE("1280x1024", DRM_MODE_TYPE_DRIVER, 108000, 1280, 1328,
       1440, 1688, 0, 1024, 1025, 1028, 1066, 0,
       DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) },
   /* 0x24 - 1280x1024@75Hz */
   { DRM_MODE("1280x1024", DRM_MODE_TYPE_DRIVER, 135000, 1280, 1296,
       1440, 1688, 0, 1024, 1025, 1028, 1066, 0,
       DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) },
   /* 0x25 - 1280x1024@85Hz */
   { DRM_MODE("1280x1024", DRM_MODE_TYPE_DRIVER, 157500, 1280, 1344,
       1504, 1728, 0, 1024, 1025, 1028, 1072, 0,
       DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) },
   /* 0x26 - 1280x1024@120Hz RB */
   { DRM_MODE("1280x1024", DRM_MODE_TYPE_DRIVER, 187250, 1280, 1328,
       1360, 1440, 0, 1024, 1027, 1034, 1084, 0,
       DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC) },
   /* 0x27 - 1360x768@60Hz */
   { DRM_MODE("1360x768", DRM_MODE_TYPE_DRIVER, 85500, 1360, 1424,
       1536, 1792, 0, 768, 771, 777, 795, 0,
       DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) },
   /* 0x28 - 1360x768@120Hz RB */
   { DRM_MODE("1360x768", DRM_MODE_TYPE_DRIVER, 148250, 1360, 1408,
       1440, 1520, 0, 768, 771, 776, 813, 0,
       DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC) },
   /* 0x51 - 1366x768@60Hz */
   { DRM_MODE("1366x768", DRM_MODE_TYPE_DRIVER, 85500, 1366, 1436,
       1579, 1792, 0, 768, 771, 774, 798, 0,
       DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) },
   /* 0x56 - 1366x768@60Hz */
   { DRM_MODE("1366x768", DRM_MODE_TYPE_DRIVER, 72000, 1366, 1380,
       1436, 1500, 0, 768, 769, 772, 800, 0,
       DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) },
   /* 0x29 - 1400x1050@60Hz RB */
   { DRM_MODE("1400x1050", DRM_MODE_TYPE_DRIVER, 101000, 1400, 1448,
       1480, 1560, 0, 1050, 1053, 1057, 1080, 0,
       DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC) },
   /* 0x2a - 1400x1050@60Hz */
   { DRM_MODE("1400x1050", DRM_MODE_TYPE_DRIVER, 121750, 1400, 1488,
       1632, 1864, 0, 1050, 1053, 1057, 1089, 0,
       DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC) },
   /* 0x2b - 1400x1050@75Hz */
   { DRM_MODE("1400x1050", DRM_MODE_TYPE_DRIVER, 156000, 1400, 1504,
       1648, 1896, 0, 1050, 1053, 1057, 1099, 0,
       DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC) },
   /* 0x2c - 1400x1050@85Hz */
   { DRM_MODE("1400x1050", DRM_MODE_TYPE_DRIVER, 179500, 1400, 1504,
       1656, 1912, 0, 1050, 1053, 1057, 1105, 0,
       DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC) },
   /* 0x2d - 1400x1050@120Hz RB */
   { DRM_MODE("1400x1050", DRM_MODE_TYPE_DRIVER, 208000, 1400, 1448,
       1480, 1560, 0, 1050, 1053, 1057, 1112, 0,
       DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC) },
   /* 0x2e - 1440x900@60Hz RB */
   { DRM_MODE("1440x900", DRM_MODE_TYPE_DRIVER, 88750, 1440, 1488,
       1520, 1600, 0, 900, 903, 909, 926, 0,
       DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC) },
   /* 0x2f - 1440x900@60Hz */
   { DRM_MODE("1440x900", DRM_MODE_TYPE_DRIVER, 106500, 1440, 1520,
       1672, 1904, 0, 900, 903, 909, 934, 0,
       DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC) },
   /* 0x30 - 1440x900@75Hz */
   { DRM_MODE("1440x900", DRM_MODE_TYPE_DRIVER, 136750, 1440, 1536,
       1688, 1936, 0, 900, 903, 909, 942, 0,
       DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC) },
   /* 0x31 - 1440x900@85Hz */
   { DRM_MODE("1440x900", DRM_MODE_TYPE_DRIVER, 157000, 1440, 1544,
       1696, 1952, 0, 900, 903, 909, 948, 0,
       DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC) },
   /* 0x32 - 1440x900@120Hz RB */
   { DRM_MODE("1440x900", DRM_MODE_TYPE_DRIVER, 182750, 1440, 1488,
       1520, 1600, 0, 900, 903, 909, 953, 0,
       DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC) },
   /* 0x53 - 1600x900@60Hz */
   { DRM_MODE("1600x900", DRM_MODE_TYPE_DRIVER, 108000, 1600, 1624,
       1704, 1800, 0, 900, 901, 904, 1000, 0,
       DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) },
   /* 0x33 - 1600x1200@60Hz */
   { DRM_MODE("1600x1200", DRM_MODE_TYPE_DRIVER, 162000, 1600, 1664,
       1856, 2160, 0, 1200, 1201, 1204, 1250, 0,
       DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) },
   /* 0x34 - 1600x1200@65Hz */
   { DRM_MODE("1600x1200", DRM_MODE_TYPE_DRIVER, 175500, 1600, 1664,
       1856, 2160, 0, 1200, 1201, 1204, 1250, 0,
       DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) },
   /* 0x35 - 1600x1200@70Hz */
   { DRM_MODE("1600x1200", DRM_MODE_TYPE_DRIVER, 189000, 1600, 1664,
       1856, 2160, 0, 1200, 1201, 1204, 1250, 0,
       DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) },
   /* 0x36 - 1600x1200@75Hz */
   { DRM_MODE("1600x1200", DRM_MODE_TYPE_DRIVER, 202500, 1600, 1664,
       1856, 2160, 0, 1200, 1201, 1204, 1250, 0,
       DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) },
   /* 0x37 - 1600x1200@85Hz */
   { DRM_MODE("1600x1200", DRM_MODE_TYPE_DRIVER, 229500, 1600, 1664,
       1856, 2160, 0, 1200, 1201, 1204, 1250, 0,
       DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) },
   /* 0x38 - 1600x1200@120Hz RB */
   { DRM_MODE("1600x1200", DRM_MODE_TYPE_DRIVER, 268250, 1600, 1648,
       1680, 1760, 0, 1200, 1203, 1207, 1271, 0,
       DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC) },
   /* 0x39 - 1680x1050@60Hz RB */
   { DRM_MODE("1680x1050", DRM_MODE_TYPE_DRIVER, 119000, 1680, 1728,
       1760, 1840, 0, 1050, 1053, 1059, 1080, 0,
       DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC) },
   /* 0x3a - 1680x1050@60Hz */
   { DRM_MODE("1680x1050", DRM_MODE_TYPE_DRIVER, 146250, 1680, 1784,
       1960, 2240, 0, 1050, 1053, 1059, 1089, 0,
       DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC) },
   /* 0x3b - 1680x1050@75Hz */
   { DRM_MODE("1680x1050", DRM_MODE_TYPE_DRIVER, 187000, 1680, 1800,
       1976, 2272, 0, 1050, 1053, 1059, 1099, 0,
       DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC) },
   /* 0x3c - 1680x1050@85Hz */
   { DRM_MODE("1680x1050", DRM_MODE_TYPE_DRIVER, 214750, 1680, 1808,
       1984, 2288, 0, 1050, 1053, 1059, 1105, 0,
       DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC) },
   /* 0x3d - 1680x1050@120Hz RB */
   { DRM_MODE("1680x1050", DRM_MODE_TYPE_DRIVER, 245500, 1680, 1728,
       1760, 1840, 0, 1050, 1053, 1059, 1112, 0,
       DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC) },
   /* 0x3e - 1792x1344@60Hz */
   { DRM_MODE("1792x1344", DRM_MODE_TYPE_DRIVER, 204750, 1792, 1920,
       2120, 2448, 0, 1344, 1345, 1348, 1394, 0,
       DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC) },
   /* 0x3f - 1792x1344@75Hz */
   { DRM_MODE("1792x1344", DRM_MODE_TYPE_DRIVER, 261000, 1792, 1888,
       2104, 2456, 0, 1344, 1345, 1348, 1417, 0,
       DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC) },
   /* 0x40 - 1792x1344@120Hz RB */
   { DRM_MODE("1792x1344", DRM_MODE_TYPE_DRIVER, 333250, 1792, 1840,
       1872, 1952, 0, 1344, 1347, 1351, 1423, 0,
       DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC) },
   /* 0x41 - 1856x1392@60Hz */
   { DRM_MODE("1856x1392", DRM_MODE_TYPE_DRIVER, 218250, 1856, 1952,
       2176, 2528, 0, 1392, 1393, 1396, 1439, 0,
       DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC) },
   /* 0x42 - 1856x1392@75Hz */
   { DRM_MODE("1856x1392", DRM_MODE_TYPE_DRIVER, 288000, 1856, 1984,
       2208, 2560, 0, 1392, 1393, 1396, 1500, 0,
       DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC) },
   /* 0x43 - 1856x1392@120Hz RB */
   { DRM_MODE("1856x1392", DRM_MODE_TYPE_DRIVER, 356500, 1856, 1904,
       1936, 2016, 0, 1392, 1395, 1399, 1474, 0,
       DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC) },
   /* 0x52 - 1920x1080@60Hz */
   { DRM_MODE("1920x1080", DRM_MODE_TYPE_DRIVER, 148500, 1920, 2008,
       2052, 2200, 0, 1080, 1084, 1089, 1125, 0,
       DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) },
   /* 0x44 - 1920x1200@60Hz RB */
   { DRM_MODE("1920x1200", DRM_MODE_TYPE_DRIVER, 154000, 1920, 1968,
       2000, 2080, 0, 1200, 1203, 1209, 1235, 0,
       DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC) },
   /* 0x45 - 1920x1200@60Hz */
   { DRM_MODE("1920x1200", DRM_MODE_TYPE_DRIVER, 193250, 1920, 2056,
       2256, 2592, 0, 1200, 1203, 1209, 1245, 0,
       DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC) },
   /* 0x46 - 1920x1200@75Hz */
   { DRM_MODE("1920x1200", DRM_MODE_TYPE_DRIVER, 245250, 1920, 2056,
       2264, 2608, 0, 1200, 1203, 1209, 1255, 0,
       DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC) },
   /* 0x47 - 1920x1200@85Hz */
   { DRM_MODE("1920x1200", DRM_MODE_TYPE_DRIVER, 281250, 1920, 2064,
       2272, 2624, 0, 1200, 1203, 1209, 1262, 0,
       DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC) },
   /* 0x48 - 1920x1200@120Hz RB */
   { DRM_MODE("1920x1200", DRM_MODE_TYPE_DRIVER, 317000, 1920, 1968,
       2000, 2080, 0, 1200, 1203, 1209, 1271, 0,
       DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC) },
   /* 0x49 - 1920x1440@60Hz */
   { DRM_MODE("1920x1440", DRM_MODE_TYPE_DRIVER, 234000, 1920, 2048,
       2256, 2600, 0, 1440, 1441, 1444, 1500, 0,
       DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC) },
   /* 0x4a - 1920x1440@75Hz */
   { DRM_MODE("1920x1440", DRM_MODE_TYPE_DRIVER, 297000, 1920, 2064,
       2288, 2640, 0, 1440, 1441, 1444, 1500, 0,
       DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC) },
   /* 0x4b - 1920x1440@120Hz RB */
   { DRM_MODE("1920x1440", DRM_MODE_TYPE_DRIVER, 380500, 1920, 1968,
       2000, 2080, 0, 1440, 1443, 1447, 1525, 0,
       DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC) },
   /* 0x54 - 2048x1152@60Hz */
   { DRM_MODE("2048x1152", DRM_MODE_TYPE_DRIVER, 162000, 2048, 2074,
       2154, 2250, 0, 1152, 1153, 1156, 1200, 0,
       DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) },
   /* 0x4c - 2560x1600@60Hz RB */
   { DRM_MODE("2560x1600", DRM_MODE_TYPE_DRIVER, 268500, 2560, 2608,
       2640, 2720, 0, 1600, 1603, 1609, 1646, 0,
       DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC) },
   /* 0x4d - 2560x1600@60Hz */
   { DRM_MODE("2560x1600", DRM_MODE_TYPE_DRIVER, 348500, 2560, 2752,
       3032, 3504, 0, 1600, 1603, 1609, 1658, 0,
       DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC) },
   /* 0x4e - 2560x1600@75Hz */
   { DRM_MODE("2560x1600", DRM_MODE_TYPE_DRIVER, 443250, 2560, 2768,
       3048, 3536, 0, 1600, 1603, 1609, 1672, 0,
       DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC) },
   /* 0x4f - 2560x1600@85Hz */
   { DRM_MODE("2560x1600", DRM_MODE_TYPE_DRIVER, 505250, 2560, 2768,
       3048, 3536, 0, 1600, 1603, 1609, 1682, 0,
       DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC) },
   /* 0x50 - 2560x1600@120Hz RB */
   { DRM_MODE("2560x1600", DRM_MODE_TYPE_DRIVER, 552750, 2560, 2608,
       2640, 2720, 0, 1600, 1603, 1609, 1694, 0,
       DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC) },
   /* 0x57 - 4096x2160@60Hz RB */
   { DRM_MODE("4096x2160", DRM_MODE_TYPE_DRIVER, 556744, 4096, 4104,
       4136, 4176, 0, 2160, 2208, 2216, 2222, 0,
       DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC) },
   /* 0x58 - 4096x2160@59.94Hz RB */
   { DRM_MODE("4096x2160", DRM_MODE_TYPE_DRIVER, 556188, 4096, 4104,
       4136, 4176, 0, 2160, 2208, 2216, 2222, 0,
       DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC) },
};

1.5 强制输出指定分辨率
当需要无视 EDID 的限制，需要强制输出某个分辨率：

diff --git a/kernel/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/kernel/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
index 8165851656..12137d0c68 100644
--- a/kernel/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
+++ b/kernel/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
@@ -2497,7 +2497,7 @@ static int dw_hdmi_connector_get_modes(struct drm_connector *connector)
                    connector);
    struct edid *edid;
    struct drm_display_mode *mode;
-   const u8 def_modes[6] = {4, 16, 31, 19, 17, 2};
+   const u8 def_modes[6] = {30, 16, 31, 19, 17, 2}; //把def_mode数组的第一个值对应的是默认显示hdmi的分辨率对应的 vic(dw-hdmi.c文件中)
    struct drm_display_info *info = &connector->display_info;
    struct hdr_static_metadata *metedata =
            &connector->display_info.hdmi.hdr_panel_metadata;
@@ -2507,6 +2507,7 @@ static int dw_hdmi_connector_get_modes(struct drm_connector *connector)
        return 0;

    edid = drm_get_edid(connector, hdmi->ddc);
+ edid = NULL; //edid = NULL; 强制进入 EDID 读取失败的流程，不管有没有读到 EDID 都强制按def_modes 的分辨率来显示。
    if (edid) {
        dev_dbg(hdmi->dev, "got edid: width[%d] x height[%d]\n",
            edid->width_cm, edid->height_cm);
diff --git a/kernel/drivers/gpu/drm/drm_edid.c b/kernel/drivers/gpu/drm/drm_edid.c
index 3fd2dd5c4a..4cac0b7584 100644
--- a/kernel/drivers/gpu/drm/drm_edid.c
+++ b/kernel/drivers/gpu/drm/drm_edid.c
@@ -820,11 +820,11 @@ static const struct drm_display_mode edid_cea_modes[] = {
        1592, 1728, 0, 576, 581, 586, 625, 0,
        DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC),
    .vrefresh = 50, .picture_aspect_ratio = HDMI_PICTURE_ASPECT_4_3, },
-   /* 30 - 1440x576@50Hz */
-   { DRM_MODE("1440x576", DRM_MODE_TYPE_DRIVER, 54000, 1440, 1464,
-       1592, 1728, 0, 576, 581, 586, 625, 0,
-       DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC),
-   .vrefresh = 50, .picture_aspect_ratio = HDMI_PICTURE_ASPECT_16_9, },
+ /* 30 - 3840x1448@60Hz */
+ { DRM_MODE("3840x1448", DRM_MODE_TYPE_DRIVER, 297000, 3840, 3888,
+ 3920, 4400, 0, 1448, 1451, 1456, 1538, 0,
+ DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC),
+ .vrefresh = 60, .picture_aspect_ratio = HDMI_PICTURE_ASPECT_16_9, },
    /* 31 - 1920x1080@50Hz */
    { DRM_MODE("1920x1080", DRM_MODE_TYPE_DRIVER, 148500, 1920, 2448,
        2492, 2640, 0, 1080, 1084, 1089, 1125, 0,

如果需要强制显示 4K 的分辨率，还需要注释掉以下代码，解除对 4K 分辨率的限制：

diff --git a/kernel/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c b/kernel/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
index cabddaa6f2..8cf1b19b7c 100644
--- a/kernel/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
+++ b/kernel/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
@@ -490,10 +490,12 @@ dw_hdmi_rockchip_mode_valid(struct drm_connector *connector,
    * If sink max TMDS clock < 340MHz, we should check the mode pixel
    * clock > 340MHz is YCbCr420 or not.
    */
+#if 0
    if (mode->clock > 340000 &&
    connector->display_info.max_tmds_clock < 340000 &&
    (!drm_mode_is_420(&connector->display_info, mode)|| !connector->ycbcr_420_allowed))
        return MODE_BAD;
+#endif

    if (!encoder) {
        const struct drm_connector_helper_funcs *funcs;

1.6 打开音频
RK3288 默认 HDMI 声卡和 Codec 公用，要确保以下配置打开：

&hdmi_analog_sound {
status = "okay";
}

rootroot@rootroot-desktop:~/android12-rk-outside/kernel-5.10/arch/arm64/boot/dts/rockchip$ grep hdmi_analog_sound . -R
rootroot@rootroot-desktop:~/android12-rk-outside/kernel-5.10/arch/arm64/boot/dts/rockchip$ grep hdmi . -R

./rk3588-toybrick.dtsi:   hdmi0_sound: hdmi0-sound {
./rk3588-toybrick.dtsi:       compatible = "rockchip,hdmi";
./rk3588-toybrick.dtsi:       rockchip,card-name = "rockchip-hdmi0";
./rk3588-toybrick.dtsi:       rockchip,codec = <&hdmi0>;
./rk3588-toybrick.dtsi:   hdmi1_sound: hdmi1-sound {
./rk3588-toybrick.dtsi:       compatible = "rockchip,hdmi";
./rk3588-toybrick.dtsi:       rockchip,card-name = "rockchip-hdmi1";
./rk3588-toybrick.dtsi:       rockchip,codec = <&hdmi1>;
./rk3588-vccio3-pinctrl.dtsi:   hdmi {
./rk3588-vccio3-pinctrl.dtsi:       hdmim0_tx1_cec: hdmim0-tx1-cec {
./rk3588-vccio3-pinctrl.dtsi:               /* hdmim0_tx1_cec */
./rk3588-vccio3-pinctrl.dtsi:       hdmim0_tx1_scl: hdmim0-tx1-scl {
./rk3588-vccio3-pinctrl.dtsi:               /* hdmim0_tx1_scl */
./rk3588-vccio3-pinctrl.dtsi:       hdmim0_tx1_sda: hdmim0-tx1-sda {
./rk3588-vccio3-pinctrl.dtsi:               /* hdmim0_tx1_sda */
./Makefile:dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3562-evb2-ddr4-v10-sii9022-bt1120-to-hdmi.dtb
./Makefile:dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3568-evb2-lp4x-v10-bt1120-to-hdmi.dtb
./Makefile:dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3568-evb6-ddr3-v10-rk628-bt1120-to-hdmi.dtb
./Makefile:dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3568-evb6-ddr3-v10-rk628-rgb2hdmi.dtb
./Makefile:dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3588s-evb3-lp4x-v10-sii9022-bt1120-to-hdmi.dtb
./rk3588.dtsi:       hdptxhdmi0 = &hdptxphy_hdmi0;
./rk3588.dtsi:       hdptxhdmi1 = &hdptxphy_hdmi1;
./rk3588.dtsi:       hdmi0 = &hdmi0;
./rk3588.dtsi:       hdmi1 = &hdmi1;
./rk3588.dtsi:       hdmirx0 = &hdmirx_ctrler;
./rk3588.dtsi:       rockchip,hdmi-path;
./rk3588.dtsi:   hdmi1: hdmi@fdea0000 {
./rk3588.dtsi:       compatible = "rockchip,rk3588-dw-hdmi";
./rk3588.dtsi:           <&hdptxphy_hdmi_clk1>;
./rk3588.dtsi:           "hdmitx_ref",
./rk3588.dtsi:       pinctrl-0 = <&hdmim2_tx1_cec &hdmim0_tx1_hpd &hdmim1_tx1_scl &hdmim1_tx1_sda>;
./rk3588.dtsi:       phys = <&hdptxphy_hdmi1>;
./rk3588.dtsi:       phy-names = "hdmi";
./rk3588.dtsi:           hdmi1_in: port@0 {
./rk3588.dtsi:               hdmi1_in_vp0: endpoint@0 {
./rk3588.dtsi:                   remote-endpoint = <&vp0_out_hdmi1>;
./rk3588.dtsi:               hdmi1_in_vp1: endpoint@1 {
./rk3588.dtsi:                   remote-endpoint = <&vp1_out_hdmi1>;
./rk3588.dtsi:               hdmi1_in_vp2: endpoint@2 {
./rk3588.dtsi:                   remote-endpoint = <&vp2_out_hdmi1>;
./rk3588.dtsi:   hdmirx_ctrler: hdmirx-controller@fdee0000 {
./rk3588.dtsi:       compatible = "rockchip,rk3588-hdmirx-ctrler", "rockchip,hdmirx-ctrler";
./rk3588.dtsi:       reg-names = "hdmirx_regs";
./rk3588.dtsi:       interrupt-names = "cec", "hdmi", "dma";
./rk3588.dtsi:           "hclk_s_hdmirx",
./rk3588.dtsi:       pinctrl-0 = <&hdmim1_rx>;
./rk3588.dtsi:   hdptxphy_hdmi1: hdmiphy@fed70000 {
./rk3588.dtsi:       compatible = "rockchip,rk3588-hdptx-phy-hdmi";
./rk3588.dtsi:       hdptxphy_hdmi_clk1: clk-port {
./rk3588.dtsi:       route_hdmi1: route-hdmi1 {
./rk3588.dtsi:           connect = <&vp1_out_hdmi1>;
./rk3588.dtsi:   vp0_out_hdmi1: endpoint@5 {
./rk3588.dtsi:       remote-endpoint = <&hdmi1_in_vp0>;
./rk3588.dtsi:   vp1_out_hdmi1: endpoint@5 {
./rk3588.dtsi:       remote-endpoint = <&hdmi1_in_vp1>;
./rk3588.dtsi:   vp2_out_hdmi1: endpoint@7 {
./rk3588.dtsi:       remote-endpoint = <&hdmi1_in_vp2>;
./rk3588s.dtsi:           route_hdmi0: route-hdmi0 {
./rk3588s.dtsi:               connect = <&vp0_out_hdmi0>;
./rk3588s.dtsi:                   <&qos_hdmirx>;
./rk3588s.dtsi:               vp0_out_hdmi0: endpoint@2 {
./rk3588s.dtsi:                   remote-endpoint = <&hdmi0_in_vp0>;
./rk3588s.dtsi:               vp1_out_hdmi0: endpoint@2 {
./rk3588s.dtsi:                   remote-endpoint = <&hdmi0_in_vp1>;
./rk3588s.dtsi:               vp2_out_hdmi0: endpoint@2 {
./rk3588s.dtsi:                   remote-endpoint = <&hdmi0_in_vp2>;
./rk3588s.dtsi:       rockchip,hdmi-path;
./rk3588s.dtsi:   hdmi0: hdmi@fde80000 {
./rk3588s.dtsi:       compatible = "rockchip,rk3588-dw-hdmi";
./rk3588s.dtsi:           <&hdptxphy_hdmi_clk0>;
./rk3588s.dtsi:           "hdmitx_ref",
./rk3588s.dtsi:       pinctrl-0 = <&hdmim0_tx0_cec &hdmim0_tx0_hpd &hdmim0_tx0_scl &hdmim0_tx0_sda>;
./rk3588s.dtsi:       phys = <&hdptxphy_hdmi0>;
./rk3588s.dtsi:       phy-names = "hdmi";
./rk3588s.dtsi:           hdmi0_in: port@0 {
./rk3588s.dtsi:               hdmi0_in_vp0: endpoint@0 {
./rk3588s.dtsi:                   remote-endpoint = <&vp0_out_hdmi0>;
./rk3588s.dtsi:               hdmi0_in_vp1: endpoint@1 {
./rk3588s.dtsi:                   remote-endpoint = <&vp1_out_hdmi0>;
./rk3588s.dtsi:               hdmi0_in_vp2: endpoint@2 {
./rk3588s.dtsi:                   remote-endpoint = <&vp2_out_hdmi0>;
./rk3588s.dtsi:   qos_hdmirx: qos@fdf81200 {
./rk3588s.dtsi:   hdptxphy_hdmi0: hdmiphy@fed60000 {
./rk3588s.dtsi:       compatible = "rockchip,rk3588-hdptx-phy-hdmi";
./rk3588s.dtsi:       hdptxphy_hdmi_clk0: clk-port {
./rk3588-toybrick-x0.dtsi:   /* If hdmirx node is disabled, delete the reserved-memory node here. */
./rk3588-toybrick-x0.dtsi:       /* Reserve 128MB memory for hdmirx-controller@fdee0000 */
./rk3588-toybrick-x0.dtsi:   hdmiin_dc: hdmiin-dc {
./rk3588-toybrick-x0.dtsi:   hdmiin-sound {
./rk3588-toybrick-x0.dtsi:       simple-audio-card,name = "rockchip,hdmiin";
./rk3588-toybrick-x0.dtsi:           sound-dai = <&hdmiin_dc>;
./rk3588-toybrick-x0.dtsi:&hdmi0 {
./rk3588-toybrick-x0.dtsi:&hdmi0_in_vp0 {
./rk3588-toybrick-x0.dtsi:&hdmi0_sound {

2. 常用调试方法
2.1 查看 VOP 状态
cat d/dri/0/summary

【必须打开显示器才能看到信息！^_】
console:/ #
console:/ #
console:/ # cat d/dri/0/summary
Video Port0: ACTIVE
Connector: HDMI-A-1
   bus_format[2025]: YUV8_1X24
   overlay_mode[1] output_mode[f] color_space[3], eotf:0
Display mode: 1920x1080p60
   clk[148500] real_clk[148500] type[48] flag[5]
   H: 1920 2008 2052 2200
   V: 1080 1084 1089 1125
Cluster0-win0: ACTIVE
   win_id: 0
   format: AB24 little-endian (0x34324241)[AFBC] SDR[0] color_space[0] glb_alpha[0xff]
   rotate: xmirror: 0 ymirror: 0 rotate_90: 0 rotate_270: 0
   csc: y2r[0] r2y[1] csc mode[1]
   zpos: 0
   src: pos[0, 0] rect[1920 x 1080]
   dst: pos[0, 0] rect[1920 x 1080]
   buf[0]: addr: 0x0000000001e43000 pitch: 7680 offset: 0
Video Port1: DISABLED
Video Port2: DISABLED
Video Port3: DISABLED
console:/ #

2.2 查看 Connector 状态
/sys/class/drm 目录下可以看到驱动注册的各个显卡,

可以看到注册了 card0-HDMI-A-1 和 card0-DSI-1 两种显示设备，分别表示 HDMI 和 DSI。

以 card0-HDMI-A-1 为例，其目录下有以下文件：
1.Enabled:使能状态
2.Status:连接状态
3.Mode:当前输出分辨率
4.Modes:连接设备支持的分辨率列表
5.Audioformat:连接设备支持的音频格式
6.Edid:连接设备的 EDID，可以通过命令 cat edid > /data/edid.bin 保存下来。

126|console:/ #
126|console:/ # ls -l /sys/class/drm
total 0
lrwxrwxrwx 1 root root 0 2024-05-22 10:11 card0 -> ../../devices/platform/display-subsystem/drm/card0
lrwxrwxrwx 1 root root 0 2024-05-22 10:11 card0-DP-1 -> ../../devices/platform/display-subsystem/drm/card0/card0-DP-1
lrwxrwxrwx 1 root root 0 2024-05-22 09:36 card0-HDMI-A-1 -> ../../devices/platform/display-subsystem/drm/card0/card0-HDMI-A-1
lrwxrwxrwx 1 root root 0 2024-05-22 10:11 card0-Writeback-1 -> ../../devices/platform/display-subsystem/drm/card0/card0-Writeback-1
lrwxrwxrwx 1 root root 0 2024-05-22 10:11 card1 -> ../../devices/platform/fdab0000.npu/drm/card1
lrwxrwxrwx 1 root root 0 2024-05-22 10:11 renderD128 -> ../../devices/platform/display-subsystem/drm/renderD128
lrwxrwxrwx 1 root root 0 2024-05-22 10:11 renderD129 -> ../../devices/platform/fdab0000.npu/drm/renderD129
-r--r--r-- 1 root root 4096 2024-05-22 10:11 version
console:/ #
console:/ # cd /sys/class/dr
drm/ drm_dp_aux_dev/
console:/ # cd /sys/class/drm/c
card0-DP-1/ card0-Writeback-1/ card1/
card0-HDMI-A-1/ card0/
console:/ # cd /sys/class/drm/card0-HDMI-A-1/
console:/sys/class/drm/card0-HDMI-A-1 #
console:/sys/class/drm/card0-HDMI-A-1 # ls -l
total 0
lrwxrwxrwx 1 root root 0 2021-01-01 12:00 device -> ../../card0
-r--r--r-- 1 root root 4096 2021-01-01 12:00 dpms
-r--r--r-- 1 root root 0 2021-01-01 12:00 edid
-r--r--r-- 1 root root 4096 2021-01-01 12:00 enabled
-r--r--r-- 1 root root 4096 2021-01-01 12:00 modes
drwxr-xr-x 2 root root 0 2021-01-01 12:00 power
-rw-r--r-- 1 system system 4096 2021-01-01 12:00 status
lrwxrwxrwx 1 root root 0 2021-01-01 12:00 subsystem -> ../../../../../../class/drm
-rw-r--r-- 1 root root 4096 2021-01-01 12:00 uevent
console:/sys/class/drm/card0-HDMI-A-1 #
console:/sys/class/drm/card0-HDMI-A-1 # cat edid
??????m[Z<"x诵?UN?&
PT?KqO??@:q8-@X,EVQ!
??5
?
-?#   e
:q8-@X,EVQ!q X,%VQ!rQΞ n(UVQ!
? ??>VQ!console:/sys/class/drm/card0-HDMI-A-1 # Xshell
/system/bin/sh: Xshell: inaccessible or not found
127|console:/sys/class/drm/card0-HDMI-A-1 #
127|console:/sys/class/drm/card0-HDMI-A-1 # [ 2345.859708][ T412] healthd: battery l=50 v=3 t=2.6 h=2 st=3 c=-1600 fc=100 chg=au

127|console:/sys/class/drm/card0-HDMI-A-1 # cat edid > /data/edid.bin
console:/sys/class/drm/card0-HDMI-A-1 #

2.3 查看 HDMI 工作状态
使用以下命令查看当前 HDMI 输出状态：
cat /sys/kernel/debug/dw-hdmi/status

1|console:/ #
1|console:/ # cd /sys/kernel/debug/dw-hdmi0/
console:/sys/kernel/debug/dw-hdmi0 # ls -l
total 0
-rw------- 1 root root 0 1970-01-01 00:00 ctrl
-r-------- 1 root root 0 1970-01-01 00:00 status
console:/sys/kernel/debug/dw-hdmi0 #
console:/sys/kernel/debug/dw-hdmi0 # cat status
PHY: enabled           Mode: HDMI
TMDS Mode Pixel Clk: 148500000Hz       TMDS Clk: 148500000Hz
ALLM: 0
Color Format: YUV444       Color Depth: 8 bit
Colorimetry: ITU.BT709       EOTF: Off
console:/sys/kernel/debug/dw-hdmi0 #
console:/sys/kernel/debug/dw-hdmi0 #

2.4 强制使能/禁用 HDMI
强制使能 HDMI：
echo on > /sys/class/drm/card0-HDMI-A-1/status 1

强制禁用 HDMI：
echo off > /sys/class/drm/card0-HDMI-A-1/status 1

恢复检测热插拔：
echo detect > /sys/class/drm/card0-HDMI-A-1/status

console:/sys/class/drm/card0-HDMI-A-1 # ls -l
total 0
lrwxrwxrwx 1 root root 0 2021-01-01 12:00 device -> ../../card0
-r--r--r-- 1 root root 4096 2021-01-01 12:00 dpms
-r--r--r-- 1 root root 0 2021-01-01 12:00 edid
-r--r--r-- 1 root root 4096 2021-01-01 12:00 enabled
-r--r--r-- 1 root root 4096 2021-01-01 12:00 modes
drwxr-xr-x 2 root root 0 2021-01-01 12:00 power
-rw-r--r-- 1 system system 4096 2021-01-01 12:00 status
lrwxrwxrwx 1 root root 0 2021-01-01 12:00 subsystem -> ../../../../../../class/drm
-rw-r--r-- 1 root root 4096 2021-01-01 12:00 uevent
console:/sys/class/drm/card0-HDMI-A-1 #
console:/sys/class/drm/card0-HDMI-A-1 #
console:/sys/class/drm/card0-HDMI-A-1 # cat status
connected
console:/sys/class/drm/card0-HDMI-A-1 #
console:/sys/class/drm/card0-HDMI-A-1 # echo off > status
[ 2679.081652][ T308] type=1400 audit(1716373281.203:126): avc: denied { read } for comm="UEventObserver" name="uevent" dev="sysfs" ino=15855 scontext=u:r:system_server:s0 tcontext=u:object_r:sysfs:s0 tclass=file permissive=1
[ 2679.082072][ T308] type=1400 audit(1716373281.203:127): avc: denied { open } for comm="UEventObserver" path="/sys/devices/platform/fde80000.hdmi/uevent" dev="sysfs" ino=15855 scontext=u:r:system_server:s0 tcontext=u:object_r:sysfs:s0 tclass=file permissive=1
console:/sys/class/drm/card0-HDMI-A-1 # [ 2679.082168][ T308] type=1400 audit(1716373281.203:128): avc: denied { getattr } for comm="UEventObserver" path="/sys/devices/platform/fde80000.hdmi/uevent" dev="sysfs" ino=15855 scontext=u:r:system_server:s0 tcontext=u:object_r:sysfs:s0 tclass=file permissive=1
[ 2679.149027][ T392] rockchip-vop2 fdd90000.vop: [drm:vop2_crtc_atomic_disable] Crtc atomic disable vp0

console:/sys/class/drm/card0-HDMI-A-1 #
console:/sys/class/drm/card0-HDMI-A-1 # cat status
disconnected
console:/sys/class/drm/card0-HDMI-A-1 #
console:/sys/class/drm/card0-HDMI-A-1 #
cho on > status <
console:/sys/class/drm/card0-HDMI-A-1 # [ 2695.412699][ T392] dwhdmi-rockchip fde80000.hdmi: use tmds mode
[ 2695.412900][ T392] rockchip-vop2 fdd90000.vop: [drm:vop2_crtc_atomic_enable] Update mode to 1920x1080p60, type: 11(if:800) for vp0 dclk: 148500000
[ 2695.413940][ T392] rockchip-vop2 fdd90000.vop: [drm:vop2_crtc_atomic_enable] dclk_out0 div: 0 dclk_core0 div: 2
[ 2695.413998][ T392] rockchip-vop2 fdd90000.vop: [drm:vop2_crtc_atomic_enable] set dclk_vop0 to 148500000, get 148500000
[ 2695.414093][ T392] rockchip-hdptx-phy-hdmi fed60000.hdmiphy: hdptx_ropll_cmn_config bus_width:16a8c8 rate:1485000
[ 2695.414472][ T392] rockchip-hdptx-phy-hdmi fed60000.hdmiphy: hdptx phy pll locked!
[ 2695.414508][ T392] dwhdmi-rockchip fde80000.hdmi: final tmdsclk = 148500000
[ 2695.414599][ T392] dwhdmi-rockchip fde80000.hdmi: don't use dsc mode
[ 2695.414628][ T392] dwhdmi-rockchip fde80000.hdmi: dw hdmi qp use tmds mode
[ 2695.414663][ T392] rockchip-hdptx-phy-hdmi fed60000.hdmiphy: bus_width:0x16a8c8,bit_rate:1485000
[ 2695.414925][ T392] rockchip-hdptx-phy-hdmi fed60000.hdmiphy: hdptx phy lane locked!
[ 2695.609047][ T371] dwhdmi-rockchip fde80000.hdmi: use tmds mode