[PATCH 2/3] drm/i915: Use atomic helpers for suspend.

[Maarten Lankhorst <maarten.lankhorst@linux.intel.com>]

Instead of duplicating the functionality now that we no longer need
to preserve dpll state we can move to using the upstream suspend helper.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
---
 drivers/gpu/drm/drm_atomic_helper.c  |   3 +
 drivers/gpu/drm/i915/i915_drv.c      |   8 ---
 drivers/gpu/drm/i915/i915_drv.h      |   1 +
 drivers/gpu/drm/i915/intel_display.c | 117 ++++++++++++-----------------------
 4 files changed, 42 insertions(+), 87 deletions(-)

diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index 2b430b05f35d..a2d3b094f27c 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -2102,6 +2102,9 @@ int drm_atomic_helper_resume(struct drm_device *dev,
 	err = drm_atomic_commit(state);
 	drm_modeset_unlock_all(dev);
 
+	if (err)
+		drm_atomic_state_free(state);
+
 	return err;
 }
 EXPORT_SYMBOL(drm_atomic_helper_resume);
diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 11d8414edbbe..fc9b552bfcd1 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -600,13 +600,7 @@ static int i915_drm_suspend(struct drm_device *dev)
 
 	intel_suspend_gt_powersave(dev);
 
-	/*
-	 * Disable CRTCs directly since we want to preserve sw state
-	 * for _thaw. Also, power gate the CRTC power wells.
-	 */
-	drm_modeset_lock_all(dev);
 	intel_display_suspend(dev);
-	drm_modeset_unlock_all(dev);
 
 	intel_dp_mst_suspend(dev);
 
@@ -761,9 +755,7 @@ static int i915_drm_resume(struct drm_device *dev)
 		dev_priv->display.hpd_irq_setup(dev);
 	spin_unlock_irq(&dev_priv->irq_lock);
 
-	drm_modeset_lock_all(dev);
 	intel_display_resume(dev);
-	drm_modeset_unlock_all(dev);
 
 	intel_dp_mst_resume(dev);
 
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 8216665405eb..ef289514b97e 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1848,6 +1848,7 @@ struct drm_i915_private {
 
 	enum modeset_restore modeset_restore;
 	struct mutex modeset_restore_lock;
+	struct drm_atomic_state *modeset_restore_state;
 
 	struct list_head vm_list; /* Global list of all address spaces */
 	struct i915_gtt gtt; /* VM representing the global address space */
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index e496c130364d..4c91fd1c5222 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -6393,58 +6393,19 @@ static void intel_crtc_disable_noatomic(struct drm_crtc *crtc)
  */
 int intel_display_suspend(struct drm_device *dev)
 {
-	struct drm_mode_config *config = &dev->mode_config;
-	struct drm_modeset_acquire_ctx *ctx = config->acquire_ctx;
-	struct drm_atomic_state *state;
-	struct drm_crtc *crtc;
-	unsigned crtc_mask = 0;
-	int ret = 0;
-
-	if (WARN_ON(!ctx))
-		return 0;
-
-	lockdep_assert_held(&ctx->ww_ctx);
-	state = drm_atomic_state_alloc(dev);
-	if (WARN_ON(!state))
-		return -ENOMEM;
-
-	state->acquire_ctx = ctx;
-	state->allow_modeset = true;
-
-	for_each_crtc(dev, crtc) {
-		struct drm_crtc_state *crtc_state =
-			drm_atomic_get_crtc_state(state, crtc);
-
-		ret = PTR_ERR_OR_ZERO(crtc_state);
-		if (ret)
-			goto free;
-
-		if (!crtc_state->active)
-			continue;
-
-		crtc_state->active = false;
-		crtc_mask |= 1 << drm_crtc_index(crtc);
-	}
-
-	if (crtc_mask) {
-		ret = drm_atomic_commit(state);
-
-		if (!ret) {
-			for_each_crtc(dev, crtc)
-				if (crtc_mask & (1 << drm_crtc_index(crtc)))
-					crtc->state->active = true;
-
-			return ret;
-		}
-	}
+	struct drm_i915_private *dev_priv = to_i915(dev);
+	int ret;
 
-free:
-	if (ret)
+	dev_priv->modeset_restore_state = drm_atomic_helper_suspend(dev);
+	ret = PTR_ERR_OR_ZERO(dev_priv->modeset_restore_state);
+	if (ret) {
 		DRM_ERROR("Suspending crtc's failed with %i\n", ret);
-	drm_atomic_state_free(state);
+		dev_priv->modeset_restore_state = NULL;
+	}
 	return ret;
 }
 
+
 void intel_encoder_destroy(struct drm_encoder *encoder)
 {
 	struct intel_encoder *intel_encoder = to_intel_encoder(encoder);
@@ -15909,51 +15870,49 @@ intel_modeset_setup_hw_state(struct drm_device *dev)
 
 void intel_display_resume(struct drm_device *dev)
 {
-	struct drm_atomic_state *state = drm_atomic_state_alloc(dev);
-	struct intel_connector *conn;
-	struct intel_plane *plane;
+	struct drm_i915_private *dev_priv = to_i915(dev);
+	struct drm_atomic_state *state = dev_priv->modeset_restore_state;
+	struct drm_modeset_acquire_ctx ctx;
 	struct drm_crtc *crtc;
-	int ret;
+	struct drm_crtc_state *crtc_state;
+	int ret, i;
+
+	intel_modeset_setup_hw_state(dev);
+	i915_redisable_vga(dev);
+	dev_priv->modeset_restore_state = NULL;
 
 	if (!state)
 		return;
 
-	state->acquire_ctx = dev->mode_config.acquire_ctx;
-
-	for_each_crtc(dev, crtc) {
-		struct drm_crtc_state *crtc_state =
-			drm_atomic_get_crtc_state(state, crtc);
-
-		ret = PTR_ERR_OR_ZERO(crtc_state);
-		if (ret)
-			goto err;
+	drm_modeset_acquire_init(&ctx, 0);
+	state->acquire_ctx = &ctx;
 
-		/* force a restore */
+	for_each_crtc_in_state(state, crtc, crtc_state, i) {
+		/*
+		 * Force recalculation even if we restore
+		 * current state. With fast modeset this may not result
+		 * in a modeset when the state is compatible.
+		 */
 		crtc_state->mode_changed = true;
 	}
 
-	for_each_intel_plane(dev, plane) {
-		ret = PTR_ERR_OR_ZERO(drm_atomic_get_plane_state(state, &plane->base));
-		if (ret)
-			goto err;
-	}
+retry:
+	ret = drm_modeset_lock_all_ctx(dev, &ctx);
+	if (ret == 0)
+		ret = drm_atomic_commit(state);
 
-	for_each_intel_connector(dev, conn) {
-		ret = PTR_ERR_OR_ZERO(drm_atomic_get_connector_state(state, &conn->base));
-		if (ret)
-			goto err;
+	if (ret == -EDEADLK) {
+		drm_modeset_backoff(&ctx);
+		goto retry;
 	}
 
-	intel_modeset_setup_hw_state(dev);
-
-	i915_redisable_vga(dev);
-	ret = drm_atomic_commit(state);
-	if (!ret)
-		return;
+	drm_modeset_drop_locks(&ctx);
+	drm_modeset_acquire_fini(&ctx);
 
-err:
-	DRM_ERROR("Restoring old state failed with %i\n", ret);
-	drm_atomic_state_free(state);
+	if (ret) {
+		DRM_ERROR("Restoring old state failed with %i\n", ret);
+		drm_atomic_state_free(state);
+	}
 }
 
 void intel_modeset_gem_init(struct drm_device *dev)
-- 
2.1.0

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