[REGRESSION] [BISECTED] drm/sun4i: hdmi: No HDMI output with BananaPI M1 on 6.9

[Michael]

Hi,

with v6.9 and later there is no output on the BananaPI HDMI connector.

I have bisected the issue to the following commit:

   358e76fd613a ("drm/sun4i: hdmi: Consolidate atomic_check and mode_valid")

With this patch, sun4i_hdmi_connector_clock_valid() is occasionally 
called with clock=0, causing the function to return MODE_NOCLOCK.
In the old sun4i_hdmi_mode_valid() before the patch, mode->clock is 
always!=0, maybe that gives someone a hint.

-- 
Michael