linux-kernel - Re: [PATCH v2] drm/mediatek/dp: fix mtk_dp_aux

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Date: Wed, 17 Apr 2024 15:52:20 +0200
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: Wojciech Macek <wmacek@...omium.org>,
 Chun-Kuang Hu <chunkuang.hu@...nel.org>,
 Philipp Zabel <p.zabel@...gutronix.de>, David Airlie <airlied@...il.com>,
 Daniel Vetter <daniel@...ll.ch>, Matthias Brugger <matthias.bgg@...il.com>,
 dri-devel@...ts.freedesktop.org, linux-mediatek@...ts.infradead.org,
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 chrome-platform@...ts.linux.dev
Subject: Re: [PATCH v2] drm/mediatek/dp: fix mtk_dp_aux_transfer return value

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@...omium.org>

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>