[PATCH v7 3/5] drm/bridge: analogix_dp: Restore mandatory samsung DP DT properties

[Luca Ceresoli]

> Revert the change that made samsung,link-rate and samsung,lane-count
> optional for Exynos DP. Add error checking to fail probe early if the
> required DT properties are missing.
>
> If these properties are zero, &link_train.link_rate and
> &link_train.lane_count used in the subsequent link training flow will
> also be zero, resulting in link training failure. Although all existing
> Exynos DP DT nodes already contain these two properties, this potential
> logic issue still needs to be fixed.
>
> Fixes: 0d0abd894ead ("drm: bridge: analogix/dp: add max link rate and lane count limit for RK3288")

If it's a fix, please add 'Cc: stable' too.

Also please add to the commit message the detailed analysis you wrote in
the v6 discussion, so that it will easy to find in the git history, in case
it's needed in the future.

With that added you can add: Reviewed-by: Luca Ceresoli <luca.ceresoli at bootlin.com>

Luca

-- 
Luca Ceresoli, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com