HDMI OUT Driver probe successes but Video is not coming in IMX8 platform

[vinothkumars]

Hi,

Video is not working with IMX8 variant,

But interrupt is getting while connect and disconnect the cable

[ 1.950871] imx-drm display-subsystem: bound 56268000.hdmi (ops imx_hdp_imx_ops)
[ 53.541726] imx-drm display-subsystem: HDMI-A-1: EDID is invalid:
[ 53.601575] i.mx8-hdp 56268000.hdmi: failed to get edid, use default video modes
[ 53.609715] i.mx8-hdp 56268000.hdmi: No EDID function, use default video mode
[ 53.617390] [drm] HDMI/DP Cable Plug In
[ 72.984430] [drm] HDMI/DP Cable Plug Out
[ 73.800544] i.mx8-hdp 56268000.hdmi: No EDID function, use default video mode
[ 73.807977] i.mx8-hdp 56268000.hdmi: No EDID function, use default video mode
[ 73.823163] [drm] HDMI/DP Cable Plug In

[igorpadykov]

Hi Vinothkumar

from log "hdmi: failed to get edid" seems there is no signal on hdmi i2c :

https://source.codeaurora.org/external/imx/linux-imx/tree/arch/arm64/boot/dts/freescale/imx8qm-mek.d...

 

one can try to check HDMI SCL,SDA signals with oscilloscope and debug it using

hdmi driver sources described in sect.6.4.6.7.3 Source Code Structure   i.MX Linux Reference Manual​

Best regards
igor

[vinothkumars]

Thank you Igor for the reply.