4K resolution "hardcoded" in Android 14 images

Edge2 Android
1

Hello,

I am trying to get the official Android 14 images running on my Edge 2 board, but I can"t get my full HD touchscreen properly recognized. The exact same hardware setup works with the 12 and 13 images.

Looking at the DRI properties inside the /sys folder, the display mode is not properly recognized/set for Android 14:

console:/ $ uname -a
Linux localhost 6.1.57 #44 SMP PREEMPT Fri Nov  1 14:15:57 CST 2024 aarch64 Toybox
console:/ $ cat /sys/kernel/debug/dri/0/summary                                
Video Port0: ACTIVE
    Connector:HDMI-A-1  Encoder: TMDS-462
        bus_format[100a]: RGB888_1X24
        overlay_mode[0] output_mode[f] SDR[0] color-encoding[BT.709] color-range[Full]
    Display mode: 3840x2160p24
        clk[297000] real_clk[297000] type[40] flag[5]
        H: 3840 5116 5204 5500
        V: 2160 2168 2178 2250
    Cluster0-win0: ACTIVE
        win_id: 0
        format: AB24 little-endian (0x34324241)[AFBC] pixel_blend_mode[0] glb_alpha[0xff]
        color: SDR[0] color-encoding[BT.709] color-range[Full]
        rotate: xmirror: 0 ymirror: 0 rotate_90: 0 rotate_270: 0
        csc: y2r[0] r2y[0] csc mode[0]
        zpos: 0
        src: pos[0, 0] rect[1920 x 1080]
        dst: pos[0, 0] rect[3840 x 2160]
        buf[0]: addr: 0x00000000f2005000 pitch: 7680 offset: 0
Video Port2: DISABLED

If I revert back to one of the the official 13 images, I get this instead, which matches the display that is connected:

console:/ $ uname -a
Linux localhost 5.10.157 #3 SMP PREEMPT Thu Dec 5 18:18:47 CST 2024 aarch64 Toybox
console:/ $ cat /sys/kernel/debug/dri/0/summary                                
Video Port0: ACTIVE
    Connector: HDMI-A-1
        bus_format[100a]: RGB888_1X24
        overlay_mode[0] output_mode[f] color_space[0], eotf:0
    Display mode: 1920x1200p60
        clk[193250] real_clk[193250] type[48] flag[5]
        H: 1920 2256 2456 2592
        V: 1200 1236 1242 1245
    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[0] csc mode[0]
        zpos: 0
        src: pos[0, 0] rect[1920 x 1200]
        dst: pos[0, 0] rect[1920 x 1200]
        buf[0]: addr: 0x00000000ef8c1000 pitch: 7680 offset: 0
Video Port1: DISABLED
Video Port2: DISABLED
Video Port3: DISABLED

The only way where I can get something on screen, is if I connect the board to a real 4K monitor (I tried this with a 4K TV).

So I suspect the display mode to be somehow hard-coded somewhere, and not dynamically set, based on monitor EDID like I would expect (Please note that the EDID of my touchscreen does not advertise 4K as a supported resolution).

Is this a known issue? Is it expected that I manually adjust the kernel and/or Android sources to match my touchscreen resolution?

Kind Regards,
Mathieu

2

Apply the patch below and try it out

xiong@builder:~/work/edge2-14/kernel-6.1$ git show faaec55467ec2d310962af16f8078e91ee3bc436
commit faaec55467ec2d310962af16f8078e91ee3bc436 (origin/khadas-edge2-android14, m/khadas-edge2-android14)
Author: Xiong Zhang <xiong.zhang@wesion.com>
Date:   2025-01-06 16:40:05 +0800

    Resolve the issue of incomplete display of the special HDMI resolution list
    
    Change-Id: I80eaf94a42f178f5ee7889323528f37cc9935799
    Signed-off-by: Xiong Zhang <xiong.zhang@wesion.com>

diff --git a/arch/arm64/boot/dts/rockchip/rk3588s-khadas-edge2.dts b/arch/arm64/boot/dts/rockchip/rk3588s-khadas-edge2.dts
index e387433f788d..60a5b5f29fe2 100644
--- a/arch/arm64/boot/dts/rockchip/rk3588s-khadas-edge2.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3588s-khadas-edge2.dts
@@ -233,6 +233,11 @@ &hdmi0_sound {
        status = "okay";
 };
 
+&display_subsystem {
+  clocks = <&hdptxphy_hdmi0>;
+  clock-names = "hdmi0_phy_pll";
+};
+
 &hdptxphy_hdmi0 {
        status = "okay";
 };
3

This seems to fix the issue. Thank you very much!

However, I don"t see this commit inside the official khadas-edge2-android14 branch of the linux repository on github: The last commit inside the github repo is from Oct. 12th 2024.
When can we expect an official update there?

4

Yes, it hasn’t been uploaded to GitHub yet. We will upload it soon and issue a notice when it’s released. Please stay tuned. Thank you