drm: rcar-du: Support multiple sources from the same VSP

On R-Car H3 ES2.0, DU channels 0 and 3 are served by two separate
pipelines from the same VSP. Support this in the DU driver.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>

drivers/gpu/drm/rcar-du/rcar_du_crtc.c

@@ -731,7 +731,7 @@ int rcar_du_crtc_create(struct rcar_du_group *rgrp, unsigned int index)
 	rcrtc->index = index;
 
 	if (rcar_du_has(rcdu, RCAR_DU_FEATURE_VSP1_SOURCE))
-		primary = &rcrtc->vsp->planes[0].plane;
+		primary = &rcrtc->vsp->planes[rcrtc->vsp_pipe].plane;
 	else
 		primary = &rgrp->planes[index % 2].plane;
 

drivers/gpu/drm/rcar-du/rcar_du_crtc.h

@@ -35,6 +35,8 @@ struct rcar_du_vsp;
  * @flip_wait: wait queue used to signal page flip completion
  * @outputs: bitmask of the outputs (enum rcar_du_output) driven by this CRTC
  * @group: CRTC group this CRTC belongs to
+ * @vsp: VSP feeding video to this CRTC
+ * @vsp_pipe: index of the VSP pipeline feeding video to this CRTC
  */
 struct rcar_du_crtc {
 	struct drm_crtc crtc;
@@ -52,6 +54,7 @@ struct rcar_du_crtc {
 
 	struct rcar_du_group *group;
 	struct rcar_du_vsp *vsp;
+	unsigned int vsp_pipe;
 };
 
 #define to_rcar_crtc(c)	container_of(c, struct rcar_du_crtc, crtc)

drivers/gpu/drm/rcar-du/rcar_du_kms.c

@@ -435,6 +435,81 @@ static int rcar_du_properties_init(struct rcar_du_device *rcdu)
 	return 0;
 }
 
+static int rcar_du_vsps_init(struct rcar_du_device *rcdu)
+{
+	const struct device_node *np = rcdu->dev->of_node;
+	struct of_phandle_args args;
+	struct {
+		struct device_node *np;
+		unsigned int crtcs_mask;
+	} vsps[RCAR_DU_MAX_VSPS] = { { 0, }, };
+	unsigned int vsps_count = 0;
+	unsigned int cells;
+	unsigned int i;
+	int ret;
+
+	/*
+	 * First parse the DT vsps property to populate the list of VSPs. Each
+	 * entry contains a pointer to the VSP DT node and a bitmask of the
+	 * connected DU CRTCs.
+	 */
+	cells = of_property_count_u32_elems(np, "vsps") / rcdu->num_crtcs - 1;
+	if (cells > 1)
+		return -EINVAL;
+
+	for (i = 0; i < rcdu->num_crtcs; ++i) {
+		unsigned int j;
+
+		ret = of_parse_phandle_with_fixed_args(np, "vsps", cells, i,
+						       &args);
+		if (ret < 0)
+			goto error;
+
+		/*
+		 * Add the VSP to the list or update the corresponding existing
+		 * entry if the VSP has already been added.
+		 */
+		for (j = 0; j < vsps_count; ++j) {
+			if (vsps[j].np == args.np)
+				break;
+		}
+
+		if (j < vsps_count)
+			of_node_put(args.np);
+		else
+			vsps[vsps_count++].np = args.np;
+
+		vsps[j].crtcs_mask |= BIT(i);
+
+		/* Store the VSP pointer and pipe index in the CRTC. */
+		rcdu->crtcs[i].vsp = &rcdu->vsps[j];
+		rcdu->crtcs[i].vsp_pipe = cells >= 1 ? args.args[0] : 0;
+	}
+
+	/*
+	 * Then initialize all the VSPs from the node pointers and CRTCs bitmask
+	 * computed previously.
+	 */
+	for (i = 0; i < vsps_count; ++i) {
+		struct rcar_du_vsp *vsp = &rcdu->vsps[i];
+
+		vsp->index = i;
+		vsp->dev = rcdu;
+
+		ret = rcar_du_vsp_init(vsp, vsps[i].np, vsps[i].crtcs_mask);
+		if (ret < 0)
+			goto error;
+	}
+
+	return 0;
+
+error:
+	for (i = 0; i < ARRAY_SIZE(vsps); ++i)
+		of_node_put(vsps[i].np);
+
+	return ret;
+}
+
 int rcar_du_modeset_init(struct rcar_du_device *rcdu)
 {
 	static const unsigned int mmio_offsets[] = {
@@ -504,18 +579,10 @@ int rcar_du_modeset_init(struct rcar_du_device *rcdu)
 
 	/* Initialize the compositors. */
 	if (rcar_du_has(rcdu, RCAR_DU_FEATURE_VSP1_SOURCE)) {
-		for (i = 0; i < rcdu->num_crtcs; ++i) {
-			struct rcar_du_vsp *vsp = &rcdu->vsps[i];
-
-			vsp->index = i;
-			vsp->dev = rcdu;
-			rcdu->crtcs[i].vsp = vsp;
-
-			ret = rcar_du_vsp_init(vsp);
+		ret = rcar_du_vsps_init(rcdu);
 		if (ret < 0)
 			return ret;
 	}
-	}
 
 	/* Create the CRTCs. */
 	for (i = 0; i < rcdu->num_crtcs; ++i) {

drivers/gpu/drm/rcar-du/rcar_du_vsp.c

@@ -19,6 +19,7 @@
 #include <drm/drm_gem_cma_helper.h>
 #include <drm/drm_plane_helper.h>
 
+#include <linux/bitops.h>
 #include <linux/dma-mapping.h>
 #include <linux/of_platform.h>
 #include <linux/scatterlist.h>
@@ -82,22 +83,22 @@ void rcar_du_vsp_enable(struct rcar_du_crtc *crtc)
 	 */
 	crtc->group->need_restart = true;
 
-	vsp1_du_setup_lif(crtc->vsp->vsp, 0, &cfg);
+	vsp1_du_setup_lif(crtc->vsp->vsp, crtc->vsp_pipe, &cfg);
 }
 
 void rcar_du_vsp_disable(struct rcar_du_crtc *crtc)
 {
-	vsp1_du_setup_lif(crtc->vsp->vsp, 0, NULL);
+	vsp1_du_setup_lif(crtc->vsp->vsp, crtc->vsp_pipe, NULL);
 }
 
 void rcar_du_vsp_atomic_begin(struct rcar_du_crtc *crtc)
 {
-	vsp1_du_atomic_begin(crtc->vsp->vsp, 0);
+	vsp1_du_atomic_begin(crtc->vsp->vsp, crtc->vsp_pipe);
 }
 
 void rcar_du_vsp_atomic_flush(struct rcar_du_crtc *crtc)
 {
-	vsp1_du_atomic_flush(crtc->vsp->vsp, 0);
+	vsp1_du_atomic_flush(crtc->vsp->vsp, crtc->vsp_pipe);
 }
 
 /* Keep the two tables in sync. */
@@ -163,6 +164,7 @@ static void rcar_du_vsp_plane_setup(struct rcar_du_vsp_plane *plane)
 {
 	struct rcar_du_vsp_plane_state *state =
 		to_rcar_vsp_plane_state(plane->plane.state);
+	struct rcar_du_crtc *crtc = to_rcar_crtc(state->state.crtc);
 	struct drm_framebuffer *fb = plane->plane.state->fb;
 	struct vsp1_du_atomic_config cfg = {
 		.pixelformat = 0,
@@ -193,7 +195,8 @@ static void rcar_du_vsp_plane_setup(struct rcar_du_vsp_plane *plane)
 		}
 	}
 
-	vsp1_du_atomic_update(plane->vsp->vsp, 0, plane->index, &cfg);
+	vsp1_du_atomic_update(plane->vsp->vsp, crtc->vsp_pipe,
+			      plane->index, &cfg);
 }
 
 static int rcar_du_vsp_plane_prepare_fb(struct drm_plane *plane,
@@ -289,11 +292,13 @@ static void rcar_du_vsp_plane_atomic_update(struct drm_plane *plane,
 					struct drm_plane_state *old_state)
 {
 	struct rcar_du_vsp_plane *rplane = to_rcar_vsp_plane(plane);
+	struct rcar_du_crtc *crtc = to_rcar_crtc(old_state->crtc);
 
 	if (plane->state->crtc)
 		rcar_du_vsp_plane_setup(rplane);
 	else
-		vsp1_du_atomic_update(rplane->vsp->vsp, 0, rplane->index, NULL);
+		vsp1_du_atomic_update(rplane->vsp->vsp, crtc->vsp_pipe,
+				      rplane->index, NULL);
 }
 
 static const struct drm_plane_helper_funcs rcar_du_vsp_plane_helper_funcs = {
@@ -392,23 +397,17 @@ static const struct drm_plane_funcs rcar_du_vsp_plane_funcs = {
 	.atomic_get_property = rcar_du_vsp_plane_atomic_get_property,
 };
 
-int rcar_du_vsp_init(struct rcar_du_vsp *vsp)
+int rcar_du_vsp_init(struct rcar_du_vsp *vsp, struct device_node *np,
+		     unsigned int crtcs)
 {
 	struct rcar_du_device *rcdu = vsp->dev;
 	struct platform_device *pdev;
-	struct device_node *np;
+	unsigned int num_crtcs = hweight32(crtcs);
 	unsigned int i;
 	int ret;
 
 	/* Find the VSP device and initialize it. */
-	np = of_parse_phandle(rcdu->dev->of_node, "vsps", vsp->index);
-	if (!np) {
-		dev_err(rcdu->dev, "vsps node not found\n");
-		return -ENXIO;
-	}
-
 	pdev = of_find_device_by_node(np);
-	of_node_put(np);
 	if (!pdev)
 		return -ENXIO;
 
@@ -430,15 +429,15 @@ int rcar_du_vsp_init(struct rcar_du_vsp *vsp)
 		return -ENOMEM;
 
 	for (i = 0; i < vsp->num_planes; ++i) {
-		enum drm_plane_type type = i ? DRM_PLANE_TYPE_OVERLAY
-					 : DRM_PLANE_TYPE_PRIMARY;
+		enum drm_plane_type type = i < num_crtcs
+					 ? DRM_PLANE_TYPE_PRIMARY
+					 : DRM_PLANE_TYPE_OVERLAY;
 		struct rcar_du_vsp_plane *plane = &vsp->planes[i];
 
 		plane->vsp = vsp;
 		plane->index = i;
 
-		ret = drm_universal_plane_init(rcdu->ddev, &plane->plane,
-					       1 << vsp->index,
+		ret = drm_universal_plane_init(rcdu->ddev, &plane->plane, crtcs,
 					       &rcar_du_vsp_plane_funcs,
 					       formats_kms,
 					       ARRAY_SIZE(formats_kms), type,

drivers/gpu/drm/rcar-du/rcar_du_vsp.h

@@ -64,13 +64,19 @@ to_rcar_vsp_plane_state(struct drm_plane_state *state)
 }
 
 #ifdef CONFIG_DRM_RCAR_VSP
-int rcar_du_vsp_init(struct rcar_du_vsp *vsp);
+int rcar_du_vsp_init(struct rcar_du_vsp *vsp, struct device_node *np,
+		     unsigned int crtcs);
 void rcar_du_vsp_enable(struct rcar_du_crtc *crtc);
 void rcar_du_vsp_disable(struct rcar_du_crtc *crtc);
 void rcar_du_vsp_atomic_begin(struct rcar_du_crtc *crtc);
 void rcar_du_vsp_atomic_flush(struct rcar_du_crtc *crtc);
 #else
-static inline int rcar_du_vsp_init(struct rcar_du_vsp *vsp) { return -ENXIO; };
+static inline int rcar_du_vsp_init(struct rcar_du_vsp *vsp,
+				   struct device_node *np,
+				   unsigned int crtcs)
+{
+	return -ENXIO;
+}
 static inline void rcar_du_vsp_enable(struct rcar_du_crtc *crtc) { };
 static inline void rcar_du_vsp_disable(struct rcar_du_crtc *crtc) { };
 static inline void rcar_du_vsp_atomic_begin(struct rcar_du_crtc *crtc) { };