[PATCH v6 6/9] drm/msm/dp: don't take extra references on multiple plug events

[Dmitry Baryshkov]

The upper layers might signal multiple sequential HPD plug events. Don't
take extra references and skip all further HPD plug events until we
receive the unplug event.

Fixes: 3ea2d1c3d154 ("drm/msm/dp: turn link_ready into plugged")
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/msm/dp/dp_display.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
index fa8942922b53..ce919a26fba2 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -412,6 +412,9 @@ static int msm_dp_hpd_plug_handle(struct msm_dp_display_private *dp)
 
 	guard(mutex)(&dp->plugged_lock);
 
+	if (dp->plugged)
+		return 0;
+
 	ret = pm_runtime_resume_and_get(&pdev->dev);
 	if (ret) {
 		DRM_ERROR("failed to pm_runtime_resume\n");

-- 
2.47.3