drm/exynos: use atomic helper commit

This patch replaces specific atomic commit function
with atomic helper commit one.

For this, it removes existing atomic commit function
and relevant code specific to Exynos DRM and makes
atomic helper commit to be used instead.

Below are changes for the use of atomic helper commit:
- add atomic_commit_tail callback specific to Exynos DRM
  . default implemention of atomic helper doesn't mesh well
    with runtime PM so the device driver which supports runtime
    PM should call drm_atomic_helper_commit_modeset_enables function
    prior to drm_atomic_helper_commit_planes function call.
    atomic_commit_tail callback implements this call ordering.
- allow plane commit only in case that CRTC device is enabled.
  . for this, it calls atomic_helper_commit_planes function
    with DRM_PLANE_COMMIT_ACTIVE_ONLY flag in atomic_commit_tail callback.

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

drivers/gpu/drm/exynos/exynos_drm_crtc.c

@@ -39,6 +39,14 @@ static void exynos_drm_crtc_disable(struct drm_crtc *crtc)
 
 	if (exynos_crtc->ops->disable)
 		exynos_crtc->ops->disable(exynos_crtc);
+
+	if (crtc->state->event && !crtc->state->active) {
+		spin_lock_irq(&crtc->dev->event_lock);
+		drm_crtc_send_vblank_event(crtc, crtc->state->event);
+		spin_unlock_irq(&crtc->dev->event_lock);
+
+		crtc->state->event = NULL;
+	}
 }
 
 static void

drivers/gpu/drm/exynos/exynos_drm_drv.c

@@ -38,56 +38,6 @@
 #define DRIVER_MAJOR	1
 #define DRIVER_MINOR	0
 
-struct exynos_atomic_commit {
-	struct work_struct	work;
-	struct drm_device	*dev;
-	struct drm_atomic_state *state;
-	u32			crtcs;
-};
-
-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;
-
-	drm_atomic_helper_commit_modeset_disables(dev, state);
-
-	drm_atomic_helper_commit_modeset_enables(dev, state);
-
-	/*
-	 * Exynos can't update planes with CRTCs and encoders disabled,
-	 * its updates routines, specially for FIMD, requires the clocks
-	 * to be enabled. So it is necessary to handle the modeset operations
-	 * *before* the commit_planes() step, this way it will always
-	 * have the relevant clocks enabled to perform the update.
-	 */
-
-	drm_atomic_helper_commit_planes(dev, state, 0);
-
-	drm_atomic_helper_wait_for_vblanks(dev, state);
-
-	drm_atomic_helper_cleanup_planes(dev, state);
-
-	drm_atomic_state_put(state);
-
-	spin_lock(&priv->lock);
-	priv->pending &= ~commit->crtcs;
-	spin_unlock(&priv->lock);
-
-	wake_up_all(&priv->wait);
-
-	kfree(commit);
-}
-
-static void exynos_drm_atomic_work(struct work_struct *work)
-{
-	struct exynos_atomic_commit *commit = container_of(work,
-				struct exynos_atomic_commit, work);
-
-	exynos_atomic_commit_complete(commit);
-}
-
 static struct device *exynos_drm_get_dma_device(void);
 
 static int exynos_drm_load(struct drm_device *dev, unsigned long flags)
@@ -202,65 +152,6 @@ static void exynos_drm_unload(struct drm_device *dev)
 	dev->dev_private = NULL;
 }
 
-static int commit_is_pending(struct exynos_drm_private *priv, u32 crtcs)
-{
-	bool pending;
-
-	spin_lock(&priv->lock);
-	pending = priv->pending & crtcs;
-	spin_unlock(&priv->lock);
-
-	return pending;
-}
-
-int exynos_atomic_commit(struct drm_device *dev, struct drm_atomic_state *state,
-			 bool nonblock)
-{
-	struct exynos_drm_private *priv = dev->dev_private;
-	struct exynos_atomic_commit *commit;
-	struct drm_crtc *crtc;
-	struct drm_crtc_state *crtc_state;
-	int i, ret;
-
-	commit = kzalloc(sizeof(*commit), GFP_KERNEL);
-	if (!commit)
-		return -ENOMEM;
-
-	ret = drm_atomic_helper_prepare_planes(dev, state);
-	if (ret) {
-		kfree(commit);
-		return ret;
-	}
-
-	/* This is the point of no return */
-
-	INIT_WORK(&commit->work, exynos_drm_atomic_work);
-	commit->dev = dev;
-	commit->state = state;
-
-	/* Wait until all affected CRTCs have completed previous commits and
-	 * mark them as pending.
-	 */
-	for_each_crtc_in_state(state, crtc, crtc_state, i)
-		commit->crtcs |= drm_crtc_mask(crtc);
-
-	wait_event(priv->wait, !commit_is_pending(priv, commit->crtcs));
-
-	spin_lock(&priv->lock);
-	priv->pending |= commit->crtcs;
-	spin_unlock(&priv->lock);
-
-	drm_atomic_helper_swap_state(state, true);
-
-	drm_atomic_state_get(state);
-	if (nonblock)
-		schedule_work(&commit->work);
-	else
-		exynos_atomic_commit_complete(commit);
-
-	return 0;
-}
-
 int exynos_atomic_check(struct drm_device *dev,
 			struct drm_atomic_state *state)
 {

drivers/gpu/drm/exynos/exynos_drm_fb.c

@@ -187,11 +187,40 @@ dma_addr_t exynos_drm_fb_dma_addr(struct drm_framebuffer *fb, int index)
 	return exynos_fb->dma_addr[index];
 }
 
+static void exynos_drm_atomic_commit_tail(struct drm_atomic_state *state)
+{
+	struct drm_device *dev = state->dev;
+
+	drm_atomic_helper_commit_modeset_disables(dev, state);
+
+	drm_atomic_helper_commit_modeset_enables(dev, state);
+
+	/*
+	 * Exynos can't update planes with CRTCs and encoders disabled,
+	 * its updates routines, specially for FIMD, requires the clocks
+	 * to be enabled. So it is necessary to handle the modeset operations
+	 * *before* the commit_planes() step, this way it will always
+	 * have the relevant clocks enabled to perform the update.
+	 */
+	drm_atomic_helper_commit_planes(dev, state,
+					DRM_PLANE_COMMIT_ACTIVE_ONLY);
+
+	drm_atomic_helper_commit_hw_done(state);
+
+	drm_atomic_helper_wait_for_vblanks(dev, state);
+
+	drm_atomic_helper_cleanup_planes(dev, state);
+}
+
+static struct drm_mode_config_helper_funcs exynos_drm_mode_config_helpers = {
+	.atomic_commit_tail = exynos_drm_atomic_commit_tail,
+};
+
 static const struct drm_mode_config_funcs exynos_drm_mode_config_funcs = {
 	.fb_create = exynos_user_fb_create,
 	.output_poll_changed = exynos_drm_output_poll_changed,
 	.atomic_check = exynos_atomic_check,
-	.atomic_commit = exynos_atomic_commit,
+	.atomic_commit = drm_atomic_helper_commit,
 };
 
 void exynos_drm_mode_config_init(struct drm_device *dev)
@@ -208,4 +237,5 @@ void exynos_drm_mode_config_init(struct drm_device *dev)
 	dev->mode_config.max_height = 4096;
 
 	dev->mode_config.funcs = &exynos_drm_mode_config_funcs;
+	dev->mode_config.helper_private = &exynos_drm_mode_config_helpers;
 }