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RK平台一个系统固件兼容多款屏幕

news 来源：原创 2024/9/21 8:31:19

一、需求：

一个固件兼容3款屏幕模组（mipi显示，触摸驱动，背光亮度都不一样）。硬件设计上：通过mipi读取id，或者adc读取id。

二、网上找了下：

找到个最火的博客是基于rk提供的方法，太复杂了。（第一眼就是，繁琐，又长又臭）

三、自己实现吧：

1. 修改dts，增加mipi初始化参数(在rk原有的增加-xx后缀)：

panel-init-sequence-aa = [39 01 04 B9 83 11 2A.......
];panel-init-sequence-bb = [39 01 04 B9 83 22 2A.......
]panel-init-sequence-cc = [39 01 04 B9 83 33 2A.......
]

2. 同理修改dts增加屏幕显示参数：

		disp_timings0: display-timings {native-mode = <&dsi0_timing0>;dsi0_timing0: timing0 {aa_clock-frequency = <135000000>; // 135000000aa_hactive = <1080>;aa_vactive = <1920>;aa_hfront-porch = <48>; // 48aa_hsync-len = <12>;aa_hback-porch = <16>;aa_vfront-porch = <44>;aa_vsync-len = <5>; // 5aa_vback-porch = <5>;aa_hsync-active = <0>;aa_vsync-active = <0>;aa_de-active = <0>;aa_pixelclk-active = <1>;bb_clock-frequency = <125000000>; // 135000000bb_hactive = <1080>;bb_vactive = <1920>;bb_hfront-porch = <60>; // 48bb_hsync-len = <6>;bb_hback-porch = <60>;bb_vfront-porch = <24>;bb_vsync-len = <1>; // 5bb_vback-porch = <6>;bb_hsync-active = <0>;bb_vsync-active = <0>;bb_de-active = <0>;bb_pixelclk-active = <1>;cc_clock-frequency = <125000000>; // 135000000cc_hactive = <1080>;cc_vactive = <1920>;cc_hfront-porch = <60>; // 48cc_hsync-len = <6>;cc_hback-porch = <60>;cc_vfront-porch = <24>;cc_vsync-len = <1>; // 5cc_vback-porch = <6>;cc_hsync-active = <0>;cc_vsync-active = <0>;cc_de-active = <0>;cc_pixelclk-active = <1>;};};

3. reset-delay-ms = <200>;上电，复位时间等有需要也可以同理增加。

4. 修改代码（以uboot为例， kernel就是依样画葫芦）

修改rockchip_display.c文件rockchip_ofnode_get_display_mode函数。把 FDT_GET_INT(hactive, "hactive"); 改为 FDT_GET_INT(hactive, "aa_hactive"); 部分代码：

	switch (g_panel_id) // 通过 adc采集硬件id进行赋值{case AA_PANEL_ID:printf("windra using aa display-timings dts\n");FDT_GET_INT(hactive, "aa_hactive");
...................................

同理修改rockchip_panel.c文件的static int rockchip_panel_ofdata_to_platdata(struct udevice *dev)函数。部分代码：

	switch (g_panel_id){case AAS_PANEL_ID:printf("windra using panel-init-sequence-cw\n");data = dev_read_prop(dev, "panel-init-sequence-cw", &len);break;
..........................

5. 读取屏幕id可以通过mipi（该方法rk提供，自己百度吧），也可以通过adc读取id（rk3568 Android12 sdk默认uboot有bug，需要自己修改）