disp: msm: make kms a DRM client for lastclose logic

Since some APIs previously used during lastclose are no longer
exposed to drivers (__drm_atomic_helper_disable_plane, and
__drm_atomic_helper_set_config), make kms a DRM client and use
the drm_client_modeset_commit_force API to do lastclose cleanup.

Change-Id: I543392fe79558a3996e326a0f222793c56d71e4f
Signed-off-by: Steve Cohen <cohens@codeaurora.org>

msm/msm_drv.c

@@ -813,6 +813,18 @@ static int msm_drm_init(struct device *dev, struct drm_driver *drv)
 		priv->fbdev = msm_fbdev_init(ddev);
 #endif
 
+	/* create drm client only when fbdev is not supported */
+	if (!priv->fbdev) {
+		ret = drm_client_init(ddev, &kms->client, "kms_client", NULL);
+		if (ret) {
+			DRM_ERROR("failed to init kms_client: %d\n", ret);
+			kms->client.dev = NULL;
+			goto fail;
+		}
+
+		drm_client_register(&kms->client);
+	}
+
 	priv->debug_root = debugfs_create_dir("debug",
 					ddev->primary->debugfs_root);
 	if (IS_ERR_OR_NULL(priv->debug_root)) {
@@ -928,101 +940,10 @@ static void msm_postclose(struct drm_device *dev, struct drm_file *file)
 	context_close(ctx);
 }
 
-static int msm_disable_all_modes_commit(
-		struct drm_device *dev,
-		struct drm_atomic_state *state)
-{
-	struct drm_plane *plane;
-	struct drm_crtc *crtc;
-	unsigned int plane_mask;
-	int ret;
-
-	plane_mask = 0;
-	drm_for_each_plane(plane, dev) {
-		struct drm_plane_state *plane_state;
-
-		plane_state = drm_atomic_get_plane_state(state, plane);
-		if (IS_ERR(plane_state)) {
-			ret = PTR_ERR(plane_state);
-			goto fail;
-		}
-
-		plane_state->rotation = 0;
-
-		plane->old_fb = plane->fb;
-		plane_mask |= 1 << drm_plane_index(plane);
-
-		/* disable non-primary: */
-		if (plane->type == DRM_PLANE_TYPE_PRIMARY)
-			continue;
-
-		DRM_DEBUG("disabling plane %d\n", plane->base.id);
-
-		ret = __drm_atomic_helper_disable_plane(plane, plane_state);
-		if (ret != 0)
-			DRM_ERROR("error %d disabling plane %d\n", ret,
-					plane->base.id);
-	}
-
-	drm_for_each_crtc(crtc, dev) {
-		struct drm_mode_set mode_set;
-
-		memset(&mode_set, 0, sizeof(struct drm_mode_set));
-		mode_set.crtc = crtc;
-
-		DRM_DEBUG("disabling crtc %d\n", crtc->base.id);
-
-		ret = __drm_atomic_helper_set_config(&mode_set, state);
-		if (ret != 0)
-			DRM_ERROR("error %d disabling crtc %d\n", ret,
-					crtc->base.id);
-	}
-
-	DRM_DEBUG("committing disables\n");
-	ret = drm_atomic_commit(state);
-
-fail:
-	DRM_DEBUG("disables result %d\n", ret);
-	return ret;
-}
-
-/**
- * msm_clear_all_modes - disables all planes and crtcs via an atomic commit
- *	based on restore_fbdev_mode_atomic in drm_fb_helper.c
- * @dev: device pointer
- * @Return: 0 on success, otherwise -error
- */
-static int msm_disable_all_modes(
-		struct drm_device *dev,
-		struct drm_modeset_acquire_ctx *ctx)
-{
-	struct drm_atomic_state *state;
-	int ret, i;
-
-	state = drm_atomic_state_alloc(dev);
-	if (!state)
-		return -ENOMEM;
-
-	state->acquire_ctx = ctx;
-
-	for (i = 0; i < TEARDOWN_DEADLOCK_RETRY_MAX; i++) {
-		ret = msm_disable_all_modes_commit(dev, state);
-		if (ret != -EDEADLK || ret != -ERESTARTSYS)
-			break;
-		drm_atomic_state_clear(state);
-		drm_modeset_backoff(ctx);
-	}
-
-	drm_atomic_state_put(state);
-
-	return ret;
-}
-
 static void msm_lastclose(struct drm_device *dev)
 {
 	struct msm_drm_private *priv = dev->dev_private;
 	struct msm_kms *kms = priv->kms;
-	struct drm_modeset_acquire_ctx ctx;
 	int i, rc;
 
 	/* check for splash status before triggering cleanup
@@ -1048,32 +969,17 @@ static void msm_lastclose(struct drm_device *dev)
 	flush_workqueue(priv->wq);
 
 	if (priv->fbdev) {
-		drm_fb_helper_restore_fbdev_mode_unlocked(priv->fbdev);
+		rc = drm_fb_helper_restore_fbdev_mode_unlocked(priv->fbdev);
-		return;
+		if (rc)
+			DRM_ERROR("restore FBDEV mode failed: %d\n", rc);
+	} else if (kms->client.dev) {
+		rc = drm_client_modeset_commit_force(&kms->client);
+		if (rc)
+			DRM_ERROR("client modeset commit failed: %d\n", rc);
 	}
 
-	drm_modeset_acquire_init(&ctx, 0);
-retry:
-	rc = drm_modeset_lock_all_ctx(dev, &ctx);
-	if (rc)
-		goto fail;
-
-	rc = msm_disable_all_modes(dev, &ctx);
-	if (rc)
-		goto fail;
-
 	if (kms && kms->funcs && kms->funcs->lastclose)
-		kms->funcs->lastclose(kms, &ctx);
+		kms->funcs->lastclose(kms);
-
-fail:
-	if (rc == -EDEADLK) {
-		drm_modeset_backoff(&ctx);
-		goto retry;
-	} else if (rc) {
-		pr_err("last close failed: %d\n", rc);
-	}
-	drm_modeset_drop_locks(&ctx);
-	drm_modeset_acquire_fini(&ctx);
 }
 
 static irqreturn_t msm_irq(int irq, void *arg)

msm/msm_kms.h

@@ -95,8 +95,7 @@ struct msm_kms_funcs {
 	void (*postopen)(struct msm_kms *kms, struct drm_file *file);
 	void (*preclose)(struct msm_kms *kms, struct drm_file *file);
 	void (*postclose)(struct msm_kms *kms, struct drm_file *file);
-	void (*lastclose)(struct msm_kms *kms,
+	void (*lastclose)(struct msm_kms *kms);
-			struct drm_modeset_acquire_ctx *ctx);
 	int (*register_events)(struct msm_kms *kms,
 			struct drm_mode_object *obj, u32 event, bool en);
 	void (*set_encoder_mode)(struct msm_kms *kms,
@@ -136,6 +135,9 @@ struct msm_kms {
 
 	/* mapper-id used to request GEM buffer mapped for scanout: */
 	struct msm_gem_address_space *aspace;
+
+	/* DRM client used for lastclose cleanup */
+	struct drm_client_dev client;
 };
 
 /**

msm/sde/sde_kms.c

@@ -2068,13 +2068,13 @@ static int _sde_kms_helper_reset_custom_properties(struct sde_kms *sde_kms,
 	return ret;
 }
 
-static void sde_kms_lastclose(struct msm_kms *kms,
+static void sde_kms_lastclose(struct msm_kms *kms)
-		struct drm_modeset_acquire_ctx *ctx)
 {
 	struct sde_kms *sde_kms;
 	struct drm_device *dev;
 	struct drm_atomic_state *state;
-	int ret, i;
+	struct drm_modeset_acquire_ctx ctx;
+	int ret;
 
 	if (!kms) {
 		SDE_ERROR("invalid argument\n");
@@ -2083,32 +2083,45 @@ static void sde_kms_lastclose(struct msm_kms *kms,
 
 	sde_kms = to_sde_kms(kms);
 	dev = sde_kms->dev;
+	drm_modeset_acquire_init(&ctx, 0);
 
 	state = drm_atomic_state_alloc(dev);
-	if (!state)
+	if (!state) {
-		return;
+		ret = -ENOMEM;
-
+		goto out_ctx;
-	state->acquire_ctx = ctx;
-
-	for (i = 0; i < TEARDOWN_DEADLOCK_RETRY_MAX; i++) {
-		/* add reset of custom properties to the state */
-		ret = _sde_kms_helper_reset_custom_properties(sde_kms, state);
-		if (ret)
-			break;
-
-		ret = drm_atomic_commit(state);
-		if (ret != -EDEADLK)
-			break;
-
-		drm_atomic_state_clear(state);
-		drm_modeset_backoff(ctx);
-		SDE_DEBUG("deadlock backoff on attempt %d\n", i);
 	}
 
+	state->acquire_ctx = &ctx;
+
+retry:
+	ret = drm_modeset_lock_all_ctx(dev, &ctx);
 	if (ret)
-		SDE_ERROR("failed to run last close: %d\n", ret);
+		goto out_state;
+
+	ret = _sde_kms_helper_reset_custom_properties(sde_kms, state);
+	if (ret)
+		goto out_state;
+
+	ret = drm_atomic_commit(state);
+out_state:
+	if (ret == -EDEADLK)
+		goto backoff;
 
 	drm_atomic_state_put(state);
+out_ctx:
+	drm_modeset_drop_locks(&ctx);
+	drm_modeset_acquire_fini(&ctx);
+
+	if (ret)
+		SDE_ERROR("kms lastclose failed: %d\n", ret);
+
+	return;
+
+backoff:
+	drm_atomic_state_clear(state);
+	drm_modeset_backoff(&ctx);
+
+	goto retry;
 }
 
 static int sde_kms_check_secure_transition(struct msm_kms *kms,