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

Wojciech Macek wmacek at chromium.org
Tue Apr 2 00:11:13 PDT 2024


From: Wojciech Macek <wmacek at chromium.com>

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.

Signed-off-by: Wojciech Macek <wmacek at chromium.com>
---
 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;
 	}
 
-- 
2.44.0.478.gd926399ef9-goog




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