[PATCH 1/2] Revert "drm/radeon: remove drm_vblank_get|put from pflip handling"

[Michel Dänzer]

From: Michel D?nzer <michel.daen...@amd.com>

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 D?nzer <michel.daenzer at amd.com>
---
 drivers/gpu/drm/radeon/radeon_display.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/gpu/drm/radeon/radeon_display.c 
b/drivers/gpu/drm/radeon/radeon_display.c
index 2a8b9f1..97d7a80 100644
--- a/drivers/gpu/drm/radeon/radeon_display.c
+++ b/drivers/gpu/drm/radeon/radeon_display.c
@@ -357,6 +357,7 @@ 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);
@@ -459,6 +460,12 @@ 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);

@@ -473,6 +480,16 @@ 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);
-- 
2.0.0