Open tao-song-tfs opened 1 year ago
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.
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
Hi,
ddcutil interrogate output.txt