The bridge type was set to default (Unknown). Set proper bridge type. With this fixed, debugfs output imx8mp looks proper. $ cat /sys/kernel/debug/dri/1/encoder-0/bridges bridge[0]: imx_hdmi_pvi_bridge_funcs [imx8mp_hdmi_pvi] type: [0] Unknown OF: /soc@0/bus@32c00000/display-bridge@32fc4000:fsl,imx8mp-hdmi-pvi ops: [0x0] bridge[1]: dw_hdmi_bridge_funcs [dw_hdmi] type: [11] HDMI-A OF: /soc@0/bus@32c00000/hdmi@32fd8000:fsl,imx8mp-hdmi ops: [0x7] detect edid hpd Signed-off-by: Alexander Stein <alexander.stein@xxxxxxxxxxxxxxx> --- For the record, the output before is: $ cat /sys/kernel/debug/dri/1/encoder-0/bridges bridge[0]: imx_hdmi_pvi_bridge_funcs [imx8mp_hdmi_pvi] type: [0] Unknown OF: /soc@0/bus@32c00000/display-bridge@32fc4000:fsl,imx8mp-hdmi-pvi ops: [0x0] bridge[1]: dw_hdmi_bridge_funcs [dw_hdmi] type: [0] Unknown OF: /soc@0/bus@32c00000/hdmi@32fd8000:fsl,imx8mp-hdmi ops: [0x7] detect edid hpd drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c index aca5bb0866f88..455bc15d90cc1 100644 --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c @@ -3541,6 +3541,7 @@ struct dw_hdmi *dw_hdmi_probe(struct platform_device *pdev, hdmi->bridge.interlace_allowed = true; hdmi->bridge.ddc = hdmi->ddc; hdmi->bridge.of_node = pdev->dev.of_node; + hdmi->bridge.type = DRM_MODE_CONNECTOR_HDMIA; memset(&pdevinfo, 0, sizeof(pdevinfo)); pdevinfo.parent = dev; -- 2.34.1