drm/exynos: wait all planes updates to finish

Add infrastructure to wait for all planes updates to finish by using
an atomic_t variable to track how many pending updates we are waiting
plus a wait_queue for the wait part.

It also changes vblank behaviour and keeps it enabled for all types
of updates

Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

1 files changed, 43 insertions, 1 deletions

diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.c b/drivers/gpu/drm/exynos/exynos_drm_drv.c
index 898591792b12..1350c8e2d587 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_drv.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_drv.c
@@ -45,11 +45,37 @@ struct exynos_atomic_commit {
 	u32			crtcs;
 };
 
+static void exynos_atomic_wait_for_commit(struct drm_atomic_state *state)
+{
+	struct drm_crtc_state *crtc_state;
+	struct drm_crtc *crtc;
+	int i, ret;
+
+	for_each_crtc_in_state(state, crtc, crtc_state, i) {
+		struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
+
+		if (!crtc->state->enable)
+			continue;
+
+		ret = drm_crtc_vblank_get(crtc);
+		if (ret)
+			continue;
+
+		exynos_drm_crtc_wait_pending_update(exynos_crtc);
+		drm_crtc_vblank_put(crtc);
+	}
+}
+
 static void exynos_atomic_commit_complete(struct exynos_atomic_commit *commit)
 {
 	struct drm_device *dev = commit->dev;
 	struct exynos_drm_private *priv = dev->dev_private;
 	struct drm_atomic_state *state = commit->state;
+	struct drm_plane *plane;
+	struct drm_crtc *crtc;
+	struct drm_plane_state *plane_state;
+	struct drm_crtc_state *crtc_state;
+	int i;
 
 	drm_atomic_helper_commit_modeset_disables(dev, state);
 
@@ -63,9 +89,25 @@ static void exynos_atomic_commit_complete(struct exynos_atomic_commit *commit)
 	 * have the relevant clocks enabled to perform the update.
 	 */
 
+	for_each_crtc_in_state(state, crtc, crtc_state, i) {
+		struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
+
+		atomic_set(&exynos_crtc->pending_update, 0);
+	}
+
+	for_each_plane_in_state(state, plane, plane_state, i) {
+		struct exynos_drm_crtc *exynos_crtc =
+						to_exynos_crtc(plane->crtc);
+
+		if (!plane->crtc)
+			continue;
+
+		atomic_inc(&exynos_crtc->pending_update);
+	}
+
 	drm_atomic_helper_commit_planes(dev, state);
 
-	drm_atomic_helper_wait_for_vblanks(dev, state);
+	exynos_atomic_wait_for_commit(state);
 
 	drm_atomic_helper_cleanup_planes(dev, state);