diff options
| author | Wojciech Macek <wmacek@chromium.org> | 2024-04-17 10:38:19 +0000 |
|---|---|---|
| committer | Chun-Kuang Hu <chunkuang.hu@kernel.org> | 2024-04-22 13:29:07 +0000 |
| commit | 8431fff9e0f3fc1c5844cf99a73b49b63ceed481 (patch) | |
| tree | 7e28db57e070db87bd55f414b2dded7abbd3bcb5 /drivers/gpu/drm/mediatek/mtk_dp.c | |
| parent | 499eb5197d86f54a68ced91725cd7efa1e397c01 (diff) | |
| download | lwn-8431fff9e0f3fc1c5844cf99a73b49b63ceed481.tar.gz lwn-8431fff9e0f3fc1c5844cf99a73b49b63ceed481.zip | |
drm/mediatek: dp: Fix mtk_dp_aux_transfer return value
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@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>
Diffstat (limited to 'drivers/gpu/drm/mediatek/mtk_dp.c')
| -rw-r--r-- | drivers/gpu/drm/mediatek/mtk_dp.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/gpu/drm/mediatek/mtk_dp.c b/drivers/gpu/drm/mediatek/mtk_dp.c index 0ba72102636a..536366956447 100644 --- a/drivers/gpu/drm/mediatek/mtk_dp.c +++ b/drivers/gpu/drm/mediatek/mtk_dp.c @@ -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; } |