Hi Laurent, I’m trying to bring up HDMI on the Debix Model A board using the mainline kernel, but I’m currently facing issues.
I saw that you tested the patch for HDMI support on this board in mainline, so I am hoping you could help me figure out what might be missing. To clarify — I'm using the prebuilt image provided by Debix, but I replaced the kernel image and the device tree (DTS) file in the /boot directory with ones built from the mainline kernel. I’ve enabled the following configurations in the kernel: CONFIG_DRM_DISPLAY_CONNECTOR=y CONFIG_DRM_IMX8MP_DW_HDMI_BRIDGE=y CONFIG_DRM_IMX8MP_HDMI_PVI=y CONFIG_DRM_IMX_LCDIF=y CONFIG_PHY_FSL_SAMSUNG_HDMI_PHY=y When I boot the board, I see the following HDMI/DRM related logs: debix@imx8mp-debix:~$ dmesg | grep -iE "drm|hdmi" [ 0.121979] /soc@0/bus@32c00000/display-bridge@32fc4000: Fixed dependency cycle(s) with /soc@0/bus@32c00000/hdmi@32fd8000 [ 0.122164] /soc@0/bus@32c00000/hdmi@32fd8000: Fixed dependency cycle(s) with /soc@0/bus@32c00000/display-bridge@32fc4000 [ 0.127417] /soc@0/bus@32c00000/hdmi@32fd8000: Fixed dependency cycle(s) with /hdmi-connector [ 0.127608] /hdmi-connector: Fixed dependency cycle(s) with /soc@0/bus@32c00000/hdmi@32fd8000 [ 1.947962] imx8mp-dw-hdmi-tx 32fd8000.hdmi: Detected HDMI TX controller v2.13a with HDCP (SAMSUNG HDMI TX PHY) [ 1.949220] imx8mp-dw-hdmi-tx 32fd8000.hdmi: registered DesignWare HDMI I2C bus driver [ 1.956365] [drm] Initialized imx-lcdif 1.0.0 for 32fc6000.display-controller on minor 0 [ 2.016601] imx-lcdif 32fc6000.display-controller: [drm] fb0: imx-lcdifdrmfb frame buffer device [ 8.380915] systemd[1]: Starting Load Kernel Module drm... I also checked that the display's modeline is recognized under sysfs : root@imx8mp-debix:~# ls /sys/class/drm/card0-HDMI-A-1/ connector_id dpms modes subsystem/ ddc/ edid power/ uevent device/ enabled status However, there is still no HDMI output on the display. Instead, I only see a white blinking cursor on the screen.. I'm not sure what I'm missing. Could you please help me out or point me in the right direction? Thank you for your time. Best Regards, Tarang
