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drm/mediatek: dp: Fix mtk_dp_aux_transfer return value

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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: f70ac097a2 ("drm/mediatek: Add MT8195 Embedded DisplayPort driver")
Signed-off-by: Wojciech Macek <wmacek@chromium.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: CK Hu <ck.hu@mediatek.com>
Link: https://patchwork.kernel.org/project/dri-devel/patch/20240417103819.990512-1-wmacek@chromium.org/
Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>
This commit is contained in:
Wojciech Macek 2024-04-17 10:38:19 +00:00 committed by Chun-Kuang Hu
parent 499eb5197d
commit 8431fff9e0
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/mediatek/mtk_dp.c
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@ -2104,7 +2104,7 @@ static ssize_t mtk_dp_aux_transfer(struct drm_dp_aux *mtk_aux,
if (mtk_dp->bridge.type != DRM_MODE_CONNECTOR_eDP &&
!mtk_dp->train_info.cable_plugged_in) {
ret = -EAGAIN;
ret = -EIO;
goto err;
}