Revert "drm/radeon: remove drm_vblank_get|put from pflip handling"

This reverts commit 75f36d861957cb05b7889af24c8cd4a789398304.

drm_vblank_get() is necessary to ensure the DRM vblank counter value is
up to date in drm_send_vblank_event().

Seems to fix weston hangs waiting for page flips to complete.

Signed-off-by: Michel Dänzer <michel.daenzer@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 17 insertions, 0 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_display.c b/drivers/gpu/drm/radeon/radeon_display.c
index 4db26420f38a..ef3b4d12294c 100644
--- a/drivers/gpu/drm/radeon/radeon_display.c
+++ b/drivers/gpu/drm/radeon/radeon_display.c
@@ -358,6 +358,7 @@ void radeon_crtc_handle_flip(struct radeon_device *rdev, int crtc_id)
 
         spin_unlock_irqrestore(&rdev->ddev->event_lock, flags);
 
+        drm_vblank_put(rdev->ddev, radeon_crtc->crtc_id);
         radeon_fence_unref(&work->fence);
         radeon_irq_kms_pflip_irq_get(rdev, work->crtc_id);
         queue_work(radeon_crtc->flip_queue, &work->unpin_work);
@@ -460,6 +461,12 @@ static void radeon_flip_work_func(struct work_struct *__work)
                 base &= ~7;
         }
 
+        r = drm_vblank_get(crtc->dev, radeon_crtc->crtc_id);
+        if (r) {
+                DRM_ERROR("failed to get vblank before flip\n");
+                goto pflip_cleanup;
+        }
+
         /* We borrow the event spin lock for protecting flip_work */
         spin_lock_irqsave(&crtc->dev->event_lock, flags);
 
@@ -474,6 +481,16 @@ static void radeon_flip_work_func(struct work_struct *__work)
 
         return;
 
+pflip_cleanup:
+        if (unlikely(radeon_bo_reserve(work->new_rbo, false) != 0)) {
+                DRM_ERROR("failed to reserve new rbo in error path\n");
+                goto cleanup;
+        }
+        if (unlikely(radeon_bo_unpin(work->new_rbo) != 0)) {
+                DRM_ERROR("failed to unpin new rbo in error path\n");
+        }
+        radeon_bo_unreserve(work->new_rbo);
+
 cleanup:
         drm_gem_object_unreference_unlocked(&work->old_rbo->gem_base);
         radeon_fence_unref(&work->fence);