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rockowitz avatar rockowitz commented on June 21, 2024

Looking at file drivers/gpu/drm/bridge/synopsys/dw-hdmi.c in the Linux 6.2.9 source, I see the following at line 443 in function dw_hdmi_i2c_xfer():

 443     if (addr == DDC_CI_ADDR)
 444         /*
 445          * The internal I2C controller does not support the multi-byte
 446          * read and write operations needed for DDC/CI.
 447          * TOFIX: Blacklist the DDC/CI address until we filter out
 448          * unsupported I2C operations.
 449          */
 450         return -EOPNOTSUPP;
 451

So it would appear that the Designware HDMI driver does not support DDC.

This very old google hit suggests that there was as some point work to enable DDC support.

I suggest you follow up with the folks responsible for the Designware HDMI driver. If you find out anything more, please post that information here so that others can benefit.

from ddcutil.

tao-song-tfs avatar tao-song-tfs commented on June 21, 2024

Hi,

 Thanks for looking into this issue. Sorry I didn't get notice when the issue was updated.

 I will give it a try as you suggested and update the issue if I can find a solution.

 Thanks for help!

 Regards,

 Tom

from ddcutil.

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