[Intel-gfx] [PATCH] drm/i915: Fix error handling during DPRX link training

[Jason Andryuk]

On Tue, Oct 27, 2020 at 9:36 AM Imre Deak <imre.deak at intel.com> wrote:
>
> Make sure to propagate the error result from the DPRX link training
> phase. The lack of this broke the link training fall-back logic if the
> link training failed during the DPRX phase.
>
> Fixes: b30edfd8d0b4 ("drm/i915: Switch to LTTPR non-transparent mode link training")
> References: https://gitlab.freedesktop.org/drm/intel/-/issues/1378
> Reported-by: Jason Andryuk <jandryuk at gmail.com>
> Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
> Signed-off-by: Imre Deak <imre.deak at intel.com>

Reviewed-by: Jason Andryuk <jandryuk at gmail.com>

I haven't tested, but I assume this will cause my 7200 to fail link
training (channel equalization) and cause the flashing display.  Any
suggestions there?  Would a quirk like
https://lore.kernel.org/lkml/20201023124804.11457-1-jandryuk@gmail.com/
be acceptable?

Regards,
Jason