drm/i915: Split plane data_rate into data_rate+data_rate_y

Split the currently combined plane data_rate into the proper
Y vs. CbCr components. This matches how we now track the
plane dbuf allocations, and thus will make the dbuf bandwidth
calculations actually produce the correct numbers for each
dbuf slice.
Reviewed-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220303191207.27931-3-ville.syrjala@linux.intel.com

drivers/gpu/drm/i915/display/intel_atomic_plane.c

@@ -181,29 +181,16 @@ unsigned int intel_plane_pixel_rate(const struct intel_crtc_state *crtc_state,
 }
 
 unsigned int intel_plane_data_rate(const struct intel_crtc_state *crtc_state,
-				   const struct intel_plane_state *plane_state)
+				   const struct intel_plane_state *plane_state,
+				   int color_plane)
 {
 	const struct drm_framebuffer *fb = plane_state->hw.fb;
-	unsigned int cpp;
-	unsigned int pixel_rate;
 
 	if (!plane_state->uapi.visible)
 		return 0;
 
-	pixel_rate = intel_plane_pixel_rate(crtc_state, plane_state);
-
-	cpp = fb->format->cpp[0];
-
-	/*
-	 * Based on HSD#:1408715493
-	 * NV12 cpp == 4, P010 cpp == 8
-	 *
-	 * FIXME what is the logic behind this?
-	 */
-	if (fb->format->is_yuv && fb->format->num_planes > 1)
-		cpp *= 4;
-
-	return pixel_rate * cpp;
+	return intel_plane_pixel_rate(crtc_state, plane_state) *
+		fb->format->cpp[color_plane];
 }
 
 int intel_plane_calc_min_cdclk(struct intel_atomic_state *state,
@@ -326,6 +313,7 @@ void intel_plane_set_invisible(struct intel_crtc_state *crtc_state,
 	crtc_state->nv12_planes &= ~BIT(plane->id);
 	crtc_state->c8_planes &= ~BIT(plane->id);
 	crtc_state->data_rate[plane->id] = 0;
+	crtc_state->data_rate_y[plane->id] = 0;
 	crtc_state->min_cdclk[plane->id] = 0;
 
 	plane_state->uapi.visible = false;
@@ -551,8 +539,16 @@ int intel_plane_atomic_check_with_state(const struct intel_crtc_state *old_crtc_
 	if (new_plane_state->uapi.visible || old_plane_state->uapi.visible)
 		new_crtc_state->update_planes |= BIT(plane->id);
 
-	new_crtc_state->data_rate[plane->id] =
-		intel_plane_data_rate(new_crtc_state, new_plane_state);
+	if (new_plane_state->uapi.visible &&
+	    intel_format_info_is_yuv_semiplanar(fb->format, fb->modifier)) {
+		new_crtc_state->data_rate_y[plane->id] =
+			intel_plane_data_rate(new_crtc_state, new_plane_state, 0);
+		new_crtc_state->data_rate[plane->id] =
+			intel_plane_data_rate(new_crtc_state, new_plane_state, 1);
+	} else if (new_plane_state->uapi.visible) {
+		new_crtc_state->data_rate[plane->id] =
+			intel_plane_data_rate(new_crtc_state, new_plane_state, 0);
+	}
 
 	return intel_plane_atomic_calc_changes(old_crtc_state, new_crtc_state,
 					       old_plane_state, new_plane_state);

drivers/gpu/drm/i915/display/intel_atomic_plane.h

@@ -25,7 +25,8 @@ unsigned int intel_plane_pixel_rate(const struct intel_crtc_state *crtc_state,
 				    const struct intel_plane_state *plane_state);
 
 unsigned int intel_plane_data_rate(const struct intel_crtc_state *crtc_state,
-				   const struct intel_plane_state *plane_state);
+				   const struct intel_plane_state *plane_state,
+				   int color_plane);
 void intel_plane_copy_uapi_to_hw_state(struct intel_plane_state *plane_state,
 				       const struct intel_plane_state *from_plane_state,
 				       struct intel_crtc *crtc);

drivers/gpu/drm/i915/display/intel_bw.c

@@ -578,6 +578,7 @@ static unsigned int intel_bw_crtc_num_active_planes(const struct intel_crtc_stat
 static unsigned int intel_bw_crtc_data_rate(const struct intel_crtc_state *crtc_state)
 {
 	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+	struct drm_i915_private *i915 = to_i915(crtc->base.dev);
 	unsigned int data_rate = 0;
 	enum plane_id plane_id;
 
@@ -590,6 +591,9 @@ static unsigned int intel_bw_crtc_data_rate(const struct intel_crtc_state *crtc_
 			continue;
 
 		data_rate += crtc_state->data_rate[plane_id];
+
+		if (DISPLAY_VER(i915) < 11)
+			data_rate += crtc_state->data_rate_y[plane_id];
 	}
 
 	return data_rate;
@@ -690,28 +694,24 @@ static void skl_crtc_calc_dbuf_bw(struct intel_bw_state *bw_state,
 	for_each_plane_id_on_crtc(crtc, plane_id) {
 		const struct skl_ddb_entry *ddb =
 			&crtc_state->wm.skl.plane_ddb[plane_id];
-		const struct skl_ddb_entry *ddb_y =
-			&crtc_state->wm.skl.plane_ddb_y[plane_id];
 		unsigned int data_rate = crtc_state->data_rate[plane_id];
-		unsigned int dbuf_mask = 0;
+		unsigned int dbuf_mask = skl_ddb_dbuf_slice_mask(i915, ddb);
 		enum dbuf_slice slice;
 
-		dbuf_mask |= skl_ddb_dbuf_slice_mask(i915, ddb);
-		dbuf_mask |= skl_ddb_dbuf_slice_mask(i915, ddb_y);
+		for_each_dbuf_slice_in_mask(i915, slice, dbuf_mask)
+			crtc_bw->used_bw[slice] += data_rate;
+	}
+
+	if (DISPLAY_VER(i915) >= 11)
+		return;
+
+	for_each_plane_id_on_crtc(crtc, plane_id) {
+		const struct skl_ddb_entry *ddb =
+			&crtc_state->wm.skl.plane_ddb_y[plane_id];
+		unsigned int data_rate = crtc_state->data_rate_y[plane_id];
+		unsigned int dbuf_mask = skl_ddb_dbuf_slice_mask(i915, ddb);
+		enum dbuf_slice slice;
 
-		/*
-		 * FIXME: To calculate that more properly we probably
-		 * need to split per plane data_rate into data_rate_y
-		 * and data_rate_uv for multiplanar formats in order not
-		 * to get accounted those twice if they happen to reside
-		 * on different slices.
-		 * However for pre-icl this would work anyway because
-		 * we have only single slice and for icl+ uv plane has
-		 * non-zero data rate.
-		 * So in worst case those calculation are a bit
-		 * pessimistic, which shouldn't pose any significant
-		 * problem anyway.
-		 */
 		for_each_dbuf_slice_in_mask(i915, slice, dbuf_mask)
 			crtc_bw->used_bw[slice] += data_rate;
 	}

drivers/gpu/drm/i915/display/intel_display.c

@@ -780,6 +780,7 @@ void intel_plane_disable_noatomic(struct intel_crtc *crtc,
 	intel_set_plane_visible(crtc_state, plane_state, false);
 	fixup_plane_bitmasks(crtc_state);
 	crtc_state->data_rate[plane->id] = 0;
+	crtc_state->data_rate_y[plane->id] = 0;
 	crtc_state->min_cdclk[plane->id] = 0;
 
 	if ((crtc_state->active_planes & ~BIT(PLANE_CURSOR)) == 0 &&
@@ -4813,6 +4814,7 @@ static int icl_check_nv12_planes(struct intel_crtc_state *crtc_state)
 			crtc_state->enabled_planes &= ~BIT(plane->id);
 			crtc_state->active_planes &= ~BIT(plane->id);
 			crtc_state->update_planes |= BIT(plane->id);
+			crtc_state->data_rate[plane->id] = 0;
 		}
 
 		plane_state->planar_slave = false;
@@ -4857,6 +4859,8 @@ static int icl_check_nv12_planes(struct intel_crtc_state *crtc_state)
 		crtc_state->enabled_planes |= BIT(linked->id);
 		crtc_state->active_planes |= BIT(linked->id);
 		crtc_state->update_planes |= BIT(linked->id);
+		crtc_state->data_rate[linked->id] =
+			crtc_state->data_rate_y[plane->id];
 		drm_dbg_kms(&dev_priv->drm, "Using %s as Y plane for %s\n",
 			    linked->base.name, plane->base.name);
 

drivers/gpu/drm/i915/display/intel_display_types.h

@@ -1129,7 +1129,10 @@ struct intel_crtc_state {
 
 	int min_cdclk[I915_MAX_PLANES];
 
+	/* for packed/planar CbCr */
 	u32 data_rate[I915_MAX_PLANES];
+	/* for planar Y */
+	u32 data_rate_y[I915_MAX_PLANES];
 
 	/* FIXME unify with data_rate[] */
 	u64 plane_data_rate[I915_MAX_PLANES];