vc4: HDMI Sink doesn't support RGB, something's wrong.

[Stefan Wahren]

Am 14.10.24 um 12:54 schrieb Dave Stevenson:
> On Mon, 14 Oct 2024 at 10:04, Maxime Ripard <mripard at kernel.org> wrote:
>> Hi,
>>
>> On Sun, Oct 13, 2024 at 09:57:58PM GMT, Stefan Wahren wrote:
>>> Am 13.10.24 um 21:11 schrieb Dave Stevenson:
>>>> Hi Stefan.
>>>>
>>>> On Sun, 13 Oct 2024, 18:19 Stefan Wahren, <wahrenst at gmx.net> wrote:
>>>>
>>>>      Hi,
>>>>
>>>>      i recently switch for my suspend2idle tests from Raspberry Pi Bullseye
>>>>      to Bookworm. After that testing suspend2idle shows a new warning
>>>>      which i
>>>>      never saw before:
>>>>
>>>>      HDMI Sink doesn't support RGB, something's wrong.
>>>>
>>>>
>>>> Can you provide the edid of your display please?
...
>>>
>>>
>>> The failure is coming from sink_supports_format_bpc()[1], but the flag
>>> for DRM_COLOR_FORMAT_RGB444 should have been set from
>>> update_display_info()[2] parsing the EDID.
>>>
>>> Loading that EDID in via drm.edid_firmware has given me a console at
>>> 1920x1200 at 60 without any issues, so I'm a little confused as to what
>>> is going on.
Since this warning only occurs on resume and not during normal boot, i
would assume there is no issue with EDID. Maybe the flag get lost. I
should have mention that X11 doesn't recover in this case and the
display stays black.
>>>
>>>    Dave
>>>
>>> [1] https://elixir.bootlin.com/linux/v6.12-rc2/source/drivers/gpu/drm/display/drm_hdmi_state_helper.c#L130
>>> [2] https://elixir.bootlin.com/linux/v6.12-rc2/source/drivers/gpu/drm/drm_edid.c#L6669