drm/rockchip: Replace custom wait_for_vblanks with helper

Currently the driver uses a custom function to wait for flip to complete
after an atomic commit. It was needed before because of two problems:
 - there is no hardware vblank counter, so the original helper would
   have a race condition with the vblank interrupt,
 - the driver didn't support unreferencing cursor framebuffers
   asynchronously to the commit, which was what the helper expected.
Since both problems have been solved by previous patches, we can now
make the driver use the generic helper and remove custom waiting code.

Signed-off-by: Tomasz Figa <tfiga@chromium.org>

1 files changed, 1 insertions, 63 deletions

diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_fb.c b/drivers/gpu/drm/rockchip/rockchip_drm_fb.c
index 9890eccadd3b..0f6eda023bd0 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_fb.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_fb.c
@@ -174,68 +174,6 @@ static void rockchip_drm_output_poll_changed(struct drm_device *dev)
 		drm_fb_helper_hotplug_event(fb_helper);
 }
 
-static void rockchip_crtc_wait_for_update(struct drm_crtc *crtc)
-{
-	struct rockchip_drm_private *priv = crtc->dev->dev_private;
-	int pipe = drm_crtc_index(crtc);
-	const struct rockchip_crtc_funcs *crtc_funcs = priv->crtc_funcs[pipe];
-
-	if (crtc_funcs && crtc_funcs->wait_for_update)
-		crtc_funcs->wait_for_update(crtc);
-}
-
-/*
- * We can't use drm_atomic_helper_wait_for_vblanks() because rk3288 and rk3066
- * have hardware counters for neither vblanks nor scanlines, which results in
- * a race where:
- *				| <-- HW vsync irq and reg take effect
- *	       plane_commit --> |
- *	get_vblank and wait --> |
- *				| <-- handle_vblank, vblank->count + 1
- *		 cleanup_fb --> |
- *		iommu crash --> |
- *				| <-- HW vsync irq and reg take effect
- *
- * This function is equivalent but uses rockchip_crtc_wait_for_update() instead
- * of waiting for vblank_count to change.
- */
-static void
-rockchip_atomic_wait_for_complete(struct drm_device *dev, struct drm_atomic_state *old_state)
-{
-	struct drm_crtc_state *old_crtc_state;
-	struct drm_crtc *crtc;
-	int i, ret;
-
-	for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) {
-		/* No one cares about the old state, so abuse it for tracking
-		 * and store whether we hold a vblank reference (and should do a
-		 * vblank wait) in the ->enable boolean.
-		 */
-		old_crtc_state->enable = false;
-
-		if (!crtc->state->active)
-			continue;
-
-		if (!drm_atomic_helper_framebuffer_changed(dev,
-				old_state, crtc))
-			continue;
-
-		ret = drm_crtc_vblank_get(crtc);
-		if (ret != 0)
-			continue;
-
-		old_crtc_state->enable = true;
-	}
-
-	for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) {
-		if (!old_crtc_state->enable)
-			continue;
-
-		rockchip_crtc_wait_for_update(crtc);
-		drm_crtc_vblank_put(crtc);
-	}
-}
-
 static void
 rockchip_atomic_commit_tail(struct drm_atomic_state *state)
 {
@@ -250,7 +188,7 @@ rockchip_atomic_commit_tail(struct drm_atomic_state *state)
 
 	drm_atomic_helper_commit_hw_done(state);
 
-	rockchip_atomic_wait_for_complete(dev, state);
+	drm_atomic_helper_wait_for_vblanks(dev, state);
 
 	drm_atomic_helper_cleanup_planes(dev, state);
 }