[PATCH 09/15] drm/i915/gen11: Link nv12 Y and UV planes in the atomic state, v2.

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

To make NV12 working on icl, we need to update 2 planes simultaneously.
I've chosen to do this in the CRTC step after plane validation is done,
so we know what planes are (in)visible. The linked Y plane will get
updated in intel_plane_update_planes_on_crtc(), by the call to
update_slave, which gets the master's plane_state as argument.

The link requires both planes for atomic_update to work,
so make sure skl_ddb_add_affected_planes() adds both states.

Changes since v1:
- Introduce icl_is_nv12_y_plane(), instead of hardcoding sprite numbers.
- Put all the state updating login in intel_plane_atomic_check_with_state().
- Clean up changes in intel_plane_atomic_check().

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
---
 drivers/gpu/drm/i915/intel_atomic_plane.c | 107 ++++++++++++++++++----
 drivers/gpu/drm/i915/intel_display.c      |  57 ++++++++++++
 drivers/gpu/drm/i915/intel_drv.h          |  53 +++++++++++
 drivers/gpu/drm/i915/intel_pm.c           |  12 ++-
 4 files changed, 210 insertions(+), 19 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_atomic_plane.c b/drivers/gpu/drm/i915/intel_atomic_plane.c
index d754a8ba9ffb..4f224f71d50e 100644
--- a/drivers/gpu/drm/i915/intel_atomic_plane.c
+++ b/drivers/gpu/drm/i915/intel_atomic_plane.c
@@ -117,7 +117,12 @@ int intel_plane_atomic_check_with_state(const struct intel_crtc_state *old_crtc_
 	struct intel_plane *intel_plane = to_intel_plane(plane);
 	int ret;
 
+	crtc_state->active_planes &= ~BIT(intel_plane->id);
 	intel_state->base.visible = false;
+	intel_state->linked_plane = NULL;
+	intel_state->slave = false;
+
+	/* If this is a cursor or Y plane, no further checks are needed. */
 	if (!intel_state->base.crtc && !old_plane_state->base.crtc)
 		return 0;
 
@@ -128,8 +133,6 @@ int intel_plane_atomic_check_with_state(const struct intel_crtc_state *old_crtc_
 	/* FIXME pre-g4x don't work like this */
 	if (state->visible)
 		crtc_state->active_planes |= BIT(intel_plane->id);
-	else
-		crtc_state->active_planes &= ~BIT(intel_plane->id);
 
 	if (state->visible && state->fb->format->format == DRM_FORMAT_NV12)
 		crtc_state->nv12_planes |= BIT(intel_plane->id);
@@ -142,27 +145,76 @@ int intel_plane_atomic_check_with_state(const struct intel_crtc_state *old_crtc_
 					       state);
 }
 
-static int intel_plane_atomic_check(struct drm_plane *plane,
-				    struct drm_plane_state *new_plane_state)
+static int intel_plane_atomic_check(struct drm_plane *drm_plane,
+				    struct drm_plane_state *new_drm_plane_state)
 {
-	struct drm_atomic_state *state = new_plane_state->state;
-	const struct drm_plane_state *old_plane_state =
-		drm_atomic_get_old_plane_state(state, plane);
-	struct drm_crtc *crtc = new_plane_state->crtc ?: old_plane_state->crtc;
-	const struct drm_crtc_state *old_crtc_state;
-	struct drm_crtc_state *new_crtc_state;
-
-	new_plane_state->visible = false;
+	struct intel_atomic_state *state =
+		to_intel_atomic_state(new_drm_plane_state->state);
+	struct intel_plane *plane = to_intel_plane(drm_plane);
+	const struct intel_plane_state *old_plane_state =
+		intel_atomic_get_old_plane_state(state, plane);
+	struct intel_plane_state *new_plane_state =
+		to_intel_plane_state(new_drm_plane_state);
+	struct intel_crtc *crtc = to_intel_crtc(
+		new_plane_state->base.crtc ?:
+		old_plane_state->base.crtc);
+	const struct intel_crtc_state *old_crtc_state;
+	struct intel_crtc_state *new_crtc_state;
+	struct intel_plane *linked = old_plane_state->linked_plane;
+	int ret;
+	const struct intel_plane_state *old_linked_state;
+	struct intel_plane_state *new_linked_state = NULL;
+
+	if (linked) {
+		/*
+		* Make sure a previously linked plane (and implicitly, the CRTC)
+		* is part of the atomic commit.
+		*/
+		if (!intel_atomic_get_new_plane_state(state, linked)) {
+			new_linked_state = intel_atomic_get_plane_state(state, linked);
+			if (IS_ERR(new_linked_state))
+				return PTR_ERR(new_linked_state);
+		}
+
+		old_linked_state =
+			intel_atomic_get_old_plane_state(state, linked);
+
+		/*
+		 * This will happen when we're the Y plane. In which case
+		 * old/new_state->crtc are both NULL. We still need to perform
+		 * updates on the linked plane.
+		 */
+		if (!crtc)
+			crtc = to_intel_crtc(old_linked_state->base.crtc);
+
+		WARN_ON(!crtc);
+	}
+
+	new_plane_state->base.visible = false;
 	if (!crtc)
 		return 0;
 
-	old_crtc_state = drm_atomic_get_old_crtc_state(state, crtc);
-	new_crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
+	old_crtc_state = intel_atomic_get_old_crtc_state(state, crtc);
+	new_crtc_state = intel_atomic_get_new_crtc_state(state, crtc);
+
+	if (new_linked_state &&
+	    drm_plane_index(&linked->base) < drm_plane_index(&plane->base)) {
+		/*
+		 * This function is called from drm_atomic_helper_check_planes(), which
+		 * will normally check the newly added plane for us, but since we're
+		 * already in that function, it won't check the plane if our index
+		 * is bigger than the linked index because of the
+		 * for_each_oldnew_plane_in_state() call.
+		 */
+		new_crtc_state->base.planes_changed = true;
+		ret = intel_plane_atomic_check_with_state(old_crtc_state, new_crtc_state,
+							  old_linked_state, new_linked_state);
+		if (ret)
+			return ret;
+	}
 
-	return intel_plane_atomic_check_with_state(to_intel_crtc_state(old_crtc_state),
-						   to_intel_crtc_state(new_crtc_state),
-						   to_intel_plane_state(old_plane_state),
-						   to_intel_plane_state(new_plane_state));
+	return intel_plane_atomic_check_with_state(old_crtc_state, new_crtc_state,
+						   old_plane_state, new_plane_state);
 }
 
 void intel_update_planes_on_crtc(struct intel_atomic_state *old_state,
@@ -187,6 +239,25 @@ void intel_update_planes_on_crtc(struct intel_atomic_state *old_state,
 			trace_intel_update_plane(&plane->base, crtc);
 
 			plane->update_plane(plane, new_crtc_state, new_plane_state);
+		} else if (new_plane_state->slave) {
+			struct intel_plane *master =
+				new_plane_state->linked_plane;
+
+			/*
+			 * We update the slave plane from this function because
+			 * programming it from the master plane's update_plane
+			 * callback runs into issues when the Y plane is
+			 * reassigned, disabled or used by a different plane.
+			 *
+			 * The slave plane is updated with the master plane's
+			 * plane_state.
+			 */
+			new_plane_state =
+				intel_atomic_get_new_plane_state(old_state, master);
+
+			trace_intel_update_plane(&plane->base, crtc);
+
+			plane->update_slave(plane, new_crtc_state, new_plane_state);
 		} else {
 			trace_intel_disable_plane(&plane->base, crtc);
 
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 122f3f4cfc53..a53953df6c9f 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -10736,6 +10736,60 @@ static bool check_single_encoder_cloning(struct drm_atomic_state *state,
 	return true;
 }
 
+static int icl_check_nv12_planes(struct drm_i915_private *dev_priv,
+				 struct intel_crtc *crtc,
+				 struct intel_crtc_state *crtc_state)
+{
+	struct intel_atomic_state *state = to_intel_atomic_state(crtc_state->base.state);
+	struct intel_plane *plane, *aux;
+
+	if (!crtc_state->nv12_planes)
+		return 0;
+
+	for_each_intel_plane_on_crtc(&dev_priv->drm, crtc, plane) {
+		struct intel_plane_state *plane_state, *aux_state;
+		struct drm_plane_state *drm_aux_state = NULL;
+
+		if (!(crtc_state->nv12_planes & BIT(plane->id)))
+			continue;
+
+		plane_state = intel_atomic_get_new_plane_state(state, plane);
+		if (!plane_state)
+			continue;
+
+		for_each_intel_plane_on_crtc(&dev_priv->drm, crtc, aux) {
+			if (!icl_is_nv12_y_plane(aux->id))
+				continue;
+
+			if (crtc_state->active_planes & BIT(aux->id))
+				continue;
+
+			drm_aux_state = drm_atomic_get_plane_state(&state->base, &aux->base);
+			if (IS_ERR(drm_aux_state))
+				return PTR_ERR(drm_aux_state);
+
+			break;
+		}
+
+		if (!drm_aux_state) {
+			DRM_DEBUG_KMS("Need %d free Y planes for NV12\n",
+				      hweight8(crtc_state->nv12_planes));
+
+			return -EINVAL;
+		}
+
+		plane_state->linked_plane = aux;
+
+		aux_state = to_intel_plane_state(drm_aux_state);
+		aux_state->slave = true;
+		aux_state->linked_plane = plane;
+		crtc_state->active_planes |= BIT(aux->id);
+		DRM_DEBUG_KMS("Using %s as Y plane for %s\n", aux->base.name, plane->base.name);
+	}
+
+	return 0;
+}
+
 static int intel_crtc_atomic_check(struct drm_crtc *crtc,
 				   struct drm_crtc_state *crtc_state)
 {
@@ -10807,6 +10861,9 @@ static int intel_crtc_atomic_check(struct drm_crtc *crtc,
 		if (mode_changed)
 			ret = skl_update_scaler_crtc(pipe_config);
 
+		if (!ret)
+			ret = icl_check_nv12_planes(dev_priv, intel_crtc,
+						    pipe_config);
 		if (!ret)
 			ret = skl_check_pipe_max_pixel_rate(intel_crtc,
 							    pipe_config);
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 8073a85d7178..dd9600065eff 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -539,6 +539,26 @@ struct intel_plane_state {
 	 */
 	int scaler_id;
 
+	/*
+	 * linked_plane:
+	 *
+	 * ICL planar formats require 2 planes that are updated as pairs.
+	 * This member is used to make sure the other plane is also updated
+	 * when required, and for update_slave() to find the correct
+	 * plane_state to pass as argument.
+	 */
+	struct intel_plane *linked_plane;
+
+	/*
+	 * slave:
+	 * If set don't update use the linked plane's state for updating
+	 * this plane during atomic commit with the update_slave() callback.
+	 *
+	 * It's also used by the watermark code to ignore wm calculations on
+	 * this plane. They're calculated by the linked plane's wm code.
+	 */
+	bool slave;
+
 	struct drm_intel_sprite_colorkey ckey;
 };
 
@@ -973,6 +993,9 @@ struct intel_plane {
 	void (*update_plane)(struct intel_plane *plane,
 			     const struct intel_crtc_state *crtc_state,
 			     const struct intel_plane_state *plane_state);
+	void (*update_slave)(struct intel_plane *plane,
+			     const struct intel_crtc_state *crtc_state,
+			     const struct intel_plane_state *plane_state);
 	void (*disable_plane)(struct intel_plane *plane,
 			      struct intel_crtc *crtc);
 	bool (*get_hw_state)(struct intel_plane *plane, enum pipe *pipe);
@@ -1330,6 +1353,27 @@ hdmi_to_dig_port(struct intel_hdmi *intel_hdmi)
 	return container_of(intel_hdmi, struct intel_digital_port, hdmi);
 }
 
+static inline struct intel_plane_state *
+intel_atomic_get_plane_state(struct intel_atomic_state *state,
+				 struct intel_plane *plane)
+{
+	struct drm_plane_state *ret =
+		drm_atomic_get_plane_state(&state->base, &plane->base);
+
+	if (IS_ERR(ret))
+		return ERR_CAST(ret);
+
+	return to_intel_plane_state(ret);
+}
+
+static inline struct intel_plane_state *
+intel_atomic_get_old_plane_state(struct intel_atomic_state *state,
+				 struct intel_plane *plane)
+{
+	return to_intel_plane_state(drm_atomic_get_new_plane_state(&state->base,
+								   &plane->base));
+}
+
 static inline struct intel_plane_state *
 intel_atomic_get_new_plane_state(struct intel_atomic_state *state,
 				 struct intel_plane *plane)
@@ -2143,6 +2187,15 @@ int skl_plane_check(struct intel_crtc_state *crtc_state,
 int intel_plane_check_src_coordinates(struct intel_plane_state *plane_state);
 int chv_plane_check_rotation(const struct intel_plane_state *plane_state);
 
+static inline bool icl_is_nv12_y_plane(enum plane_id id)
+{
+	/* Don't need to do a gen check, these planes are only available on gen11 */
+	if (id == PLANE_SPRITE4 || id == PLANE_SPRITE5)
+		return true;
+
+	return false;
+}
+
 /* intel_tv.c */
 void intel_tv_init(struct drm_i915_private *dev_priv);
 
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 1db9b8328275..d76d93452137 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -5137,11 +5137,12 @@ skl_ddb_add_affected_planes(struct intel_crtc_state *cstate)
 	struct intel_atomic_state *intel_state = to_intel_atomic_state(state);
 	struct skl_ddb_allocation *new_ddb = &intel_state->wm_results.ddb;
 	struct skl_ddb_allocation *cur_ddb = &dev_priv->wm.skl_hw.ddb;
-	struct drm_plane_state *plane_state;
 	struct drm_plane *plane;
 	enum pipe pipe = intel_crtc->pipe;
 
 	drm_for_each_plane_mask(plane, dev, cstate->base.plane_mask) {
+		struct drm_plane_state *plane_state;
+		struct intel_plane *linked;
 		enum plane_id plane_id = to_intel_plane(plane)->id;
 
 		if (skl_ddb_entry_equal(&cur_ddb->plane[pipe][plane_id],
@@ -5153,6 +5154,15 @@ skl_ddb_add_affected_planes(struct intel_crtc_state *cstate)
 		plane_state = drm_atomic_get_plane_state(state, plane);
 		if (IS_ERR(plane_state))
 			return PTR_ERR(plane_state);
+
+		/* Make sure linked plane is updated too */
+		linked = to_intel_plane_state(plane_state)->linked_plane;
+		if (!linked)
+			continue;
+
+		plane_state = drm_atomic_get_plane_state(state, &linked->base);
+		if (IS_ERR(plane_state))
+			return PTR_ERR(plane_state);
 	}
 
 	return 0;
-- 
2.18.0

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