[PATCH v2] drm/mediatek/dp: fix mtk_dp_aux_transfer return value

[AngeloGioacchino Del Regno]

Il 17/04/24 12:38, Wojciech Macek ha scritto:
> In case there is no DP device attached to the port the
> transfer function should return IO error, similar to what
> other drivers do.
> In case EAGAIN is returned then any read from /dev/drm_dp_aux
> device ends up in an infinite loop as the upper layers
> constantly repeats the transfer request.
> 
> Fixes: f70ac097a2cf ("drm/mediatek: Add MT8195 Embedded DisplayPort driver")
> Signed-off-by: Wojciech Macek <wmacek at chromium.org>

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno at collabora.com>