| Message ID | 20240417103819.990512-1-wmacek@chromium.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v2] drm/mediatek/dp: fix mtk_dp_aux_transfer return value | expand |
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@chromium.org> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Hi, Wojciech: On Wed, 2024-04-17 at 10:38 +0000, Wojciech Macek wrote: > > External email : Please do not click links or open attachments until > you have verified the sender or the content. > 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. Reviewed-by: CK Hu <ck.hu@mediatek.com> > > Fixes: f70ac097a2cf ("drm/mediatek: Add MT8195 Embedded DisplayPort > driver") > Signed-off-by: Wojciech Macek <wmacek@chromium.org> > --- > Changelog v2-v1: > - added "Fixes" tag > - corrected e-mail address > > V1: > https://urldefense.com/v3/__https://patchwork.kernel.org/project/linux-mediatek/patch/20240402071113.3135903-1-wmacek@chromium.org/__;!!CTRNKA9wMg0ARbw!kBY_x5kGvdau3baCVwGwRuKojhHVIEW8Hvbw385x2pXi_1pCGMCntptpmOnEPoMbwA0dgA4JTxwfy6o$ > > drivers/gpu/drm/mediatek/mtk_dp.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > 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; > } >
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; }
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> --- Changelog v2-v1: - added "Fixes" tag - corrected e-mail address V1: https://patchwork.kernel.org/project/linux-mediatek/patch/20240402071113.3135903-1-wmacek@chromium.org/ drivers/gpu/drm/mediatek/mtk_dp.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)