RK3288 HDMI增加特殊分辨率
2024-09-04 15:33:16
转载请注明出处：https://www.cnblogs.com/lialong1st/p/9174475.html
CPU：RK3288
系统：Android 5.1
本帖以 HDMI 800x600p-60 为例，添加新的分辨率。
1、修改文件，打开调试模式，得到 EDID 信息后，记得关闭
diff --git a/kernel/drivers/video/fbmon.c b/kernel/drivers/video/fbmon.c
index 6103fa6..ce9b11e
--- a/kernel/drivers/video/fbmon.c
+++ b/kernel/drivers/video/fbmon.c
@@ -, +, @@
* EDID parser
*/ -#undef DEBUG /* define this for verbose EDID parsing output */
+//#undef DEBUG /* define this for verbose EDID parsing output */
+#define DEBUG #ifdef DEBUG
#define DPRINTK(fmt, args...) printk(fmt,## args)
2、打印出 EDID 信息
[ 0.805638] ========================================
[ 0.805652] Display Information (EDID)
[ 0.805662] ========================================
[ 0.805672] EDID Version 1.3
[ 0.805682] Manufacturer: ROW
[ 0.805691] Model:
[ 0.805699] Serial#:
[ 0.805708] Year: Week
[ 0.805719] Monitor Name: AAA
[ 0.805728] Display Characteristics:
[ 0.805738] Monitor Operating Limits: From EDID
[ 0.805754] H: -80KHz V: -76Hz DCLK: 160MHz
[ 0.805764] Digital Display Input
Sync:
[ 0.805780] Max H-size in cm: variable
[ 0.805791] Max V-size in cm: variable
[ 0.805801] Gamma: 1.0
[ 0.805813] DPMS: Active yes, Suspend no, Standby yes
[ 0.805823] Unknown
[ 0.805832] Chroma
[ 0.805840] RedX: 0.636 RedY: 0.349
[ 0.805852] GreenX: 0.290 GreenY: 0.589
[ 0.805863] BlueX: 0.143 BlueY: 0.080
[ 0.805875] WhiteX: 0.313 WhiteY: 0.329
[ 0.805886] First DETAILED Timing is preferred
[ 0.805899] Detailed Timings
[ 0.805910] MHz +HSync +VSync [ 0.805932] Supported VESA Modes
[ 0.805945] 720x400@70Hz
[ 0.805955] 640x480@60Hz
[ 0.805964] 640x480@72Hz
[ 0.805972] 640x480@75Hz
[ 0.805980] 800x600@56Hz
[ 0.805988] 800x600@60Hz
[ 0.805997] 800x600@72Hz
[ 0.806005] 800x600@75Hz
[ 0.806014] Manufacturer's mask: 0
[ 0.806023] Standard Timings
[ 0.806034] ========================================
Detailed Timings 是主要的 LCD 参数，Supported VESA Modes 是 LCD 支持的分辨率。
通过源码查看各参数的含义：
路径：kernel/drivers/video/fbmon.c
DPRINTK(" %d MHz ", PIXEL_CLOCK/);
DPRINTK("%d %d %d %d ", H_ACTIVE, H_ACTIVE + H_SYNC_OFFSET, H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH, H_ACTIVE + H_BLANKING);
DPRINTK("%d %d %d %d ", V_ACTIVE, V_ACTIVE + V_SYNC_OFFSET, V_ACTIVE + V_SYNC_OFFSET + V_SYNC_WIDTH, V_ACTIVE + V_BLANKING);
DPRINTK("%sHSync %sVSync\n\n", (HSYNC_POSITIVE) ? "+" : "-", (VSYNC_POSITIVE) ? "+" : "-");
由此可以得到 LCD 的各参数：
40M = PIXEL_CLOCK = pixclock
= H_ACTIVE = xres
= H_ACTIVE + H_SYNC_OFFSET = xres + h_fp = +
= H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH = xres + h_fp + h_pw = + +
= H_ACTIVE + H_BLANKING = xres + h_bp + h_fp + h_pw = + + +
= V_ACTIVE = yres
= V_ACTIVE + V_SYNC_OFFSET = yres + v_fp = +
= V_ACTIVE + V_SYNC_OFFSET + V_SYNC_WIDTH = yres + v_fp + v_pw = + +
= V_ACTIVE + V_BLANKING = yres + v_bp + v_fp + v_pw = + + +
+HSync = HSYNC_POSITIVE
+VSync = VSYNC_POSITIVE
3、在枚举中增加此分辨率，枚举值为 108，并修改默认分辨率
diff --git a/kernel/drivers/video/rockchip/hdmi/rockchip-hdmi.h b/kernel/drivers/video/rockchip/hdmi/rockchip-hdmi.h
index b5475e4..f31f5b9
--- a/kernel/drivers/video/rockchip/hdmi/rockchip-hdmi.h
+++ b/kernel/drivers/video/rockchip/hdmi/rockchip-hdmi.h
@@ -, +, @@ enum hdmi_video_infomation_code {
HDMI_3840X2160P_30HZ_4_3, /**/
HDMI_3840X2160P_50HZ_4_3,
HDMI_3840X2160P_60HZ_4_3,
+ HDMI_800X600P_60HZ, /**/
}; /* HDMI Extended Resolution */
@@ -, +, @@ struct hdmi {
#define HDMI_AUTO_CONFIG false /* HDMI default vide mode */
-#define HDMI_VIDEO_DEFAULT_MODE HDMI_1920X1080P_60HZ//HDMI_1280X720P_60HZ
+#define HDMI_VIDEO_DEFAULT_MODE HDMI_800X600P_60HZ//HDMI_1920X1080P_60HZ//HDMI_1280X720P_60HZ
/*HDMI_1920X1080P_60HZ*/
#define HDMI_VIDEO_DEFAULT_COLORMODE HDMI_COLOR_AUTO
#define HDMI_VIDEO_DEFAULT_COLORDEPTH 8
4、将屏参数据添加到数组 static const struct hdmi_video_timing hdmi_mode[] 中
/* name refresh xres yres pixclock h_bp h_fp v_bp v_fp h_pw v_pw polariry PorI flag vic 2ndvic pixelrepeat interface */
/* 名称 刷新频率 行像素 列像素 像素时钟 水平后沿 水平前沿 垂直后沿 垂直前沿 行同步脉宽 列同步脉宽 极性 扫描方式 标志 枚举值 第二枚举值 像素重复 接口*/
diff --git a/kernel/drivers/video/rockchip/hdmi/rockchip-hdmi-lcdc.c b/kernel/drivers/video/rockchip/hdmi/rockchip-hdmi-lcdc.c
index 63a5cfb..0f920c2
--- a/kernel/drivers/video/rockchip/hdmi/rockchip-hdmi-lcdc.c
+++ b/kernel/drivers/video/rockchip/hdmi/rockchip-hdmi-lcdc.c
@@ -, +, @@ static const struct hdmi_video_timing hdmi_mode[] = {
{ { "720x576i@50Hz", , , , , , , , , , , , , }, , HDMI_720X576I_50HZ_16_9, , OUT_P888},
{ { "720x480p@60Hz", , , , , , , , , , , , , }, , HDMI_720X480P_60HZ_16_9, , OUT_P888},
{ { "720x576p@50Hz", , , , , , , , , , , , , }, , HDMI_720X576P_50HZ_16_9, , OUT_P888},
+ { { "800x600p@60Hz", , , , , , , , , , , FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, , }, , HDMI_800X600P_60HZ, , OUT_P888},
{ { "1280x720p@24Hz", , , , , , , , , , , FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, , }, , HDMI_1280X720P_24HZ_4_3, , OUT_P888},
{ { "1280x720p@25Hz", , , , , , , , , , , FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, , }, , HDMI_1280X720P_25HZ_4_3, , OUT_P888},
{ { "1280x720p@30Hz", , , , , , , , , , , FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, , }, , HDMI_1280X720P_30HZ_4_3, , OUT_P888},
polariry：水平同步高电平有效和垂直同步高电平有效
PorI：0 为不是隔行扫描。定义文件路径：/kernel/include/uapi/linux/fb.h
flag：不知道什么意思
vic：在分辨率枚举中的编号，本次添加的为 108
5、此时 HDMI 可以正常输入 800x600 的分辨率，但是实际显示可能有问题。
根据显示器的 EDID 修改 dts 中加载的屏参文件，修改值与添加到 HDMI 数组中的相同。
diff --git a/kernel/arch/arm/boot/dts/lcd-800x600.dtsi b/kernel/arch/arm/boot/dts/lcd-800x600.dtsi
index c0baf15..733a157
--- a/kernel/arch/arm/boot/dts/lcd-800x600.dtsi
+++ b/kernel/arch/arm/boot/dts/lcd-800x600.dtsi
@@ -, +, @@
clock-frequency = <>;
- hactive = <>;
- vactive = <>;
- hback-porch = <>;
- hfront-porch = <>;
- vback-porch = <>;
- vfront-porch = <>;
- hsync-len = <>;
- vsync-len = <>;
+ hactive = <>;
+ vactive = <>;
+ hback-porch = <>;
+ hfront-porch = <>;
+ vback-porch = <>;
+ vfront-porch = <>;
+ hsync-len = <>;
+ vsync-len = <>;
hsync-active = <>;
vsync-active = <>;
de-active = <>;
6、编译烧录，HDMI 显示正常，确认当前分辨率可以在设置 -> HDMI ->分辨率设置中查看，也可以通过指令查看。
$ cat /sys/class/display/HDMI/mode
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