Trying to run ddcutil on IMX93 facing no display found error

[arka]

Hi ,

I am trying to test ddcutil on imx93 platform facing no display found issue.

The IMX93, the HDMI output is routed through a MIPI-DSI to HDMI bridge (ADV7535),

On your i.MX93 + ADV7535 setup:

The SoC talks to the ADV7535 via I²C1

We checked the sysfs entry for i2c-dev under
/sys/class/drm/card0-HDMI/ddc/i2c-dev/
and found that no I²C entry was created.

We couldn't find any patch or support for ddcutil with ADV7535

please share you  suggestion MIPI-DSI to HDMI bridge (ADV7535) with ddcutil 

root@osm-imx93:~# ddcutil detect
No displays found.
Could you please advise on how to resolve this issue? I have confirmed that DDC/CI is enabled on the monitor.


we have set the udev rules

https://blog.tcharles.fr/ddc-ci-screen-control-on-linux/


The HDMI is working fine ,but the error shows only while running ddcutil detect

[AldoG]

Hello,

Please note that the I2C being used for DDC is part of the ADV7535 itself and not the same being used to communicate to the i.MX, so as this is being used by the driver itself is not exposed to the userspace, if you want to change something related to it, you may do so by modifying the driver.

Best regards/Saludos,
Aldo.

[arka]

Hi @AldoG ,

If you have any patch or modified driver where the I2C is exposed to userspace, could you please share it to solve my issue?

[AldoG]

Hello,

Please note that the ADV7535 is not an NXP part, so we do not support the driver and/or modifications to it, even I have looked into the analog devices community and it is mentioned that this information is under NDA for some reason, just for your interest:
https://ez.analog.com/video/f/q-a/599901/how-to-add-ddc-support-for-adv7535-dsi-to-hdmi-bridge-on-yo...

So for this I would recommend to contact them on how to proceed.

Best regards/Saludos,
Aldo.