v4l: vsp1: Add support for multiple DRM pipelines

The R-Car H3 ES2.0 VSP-DL instance has two LIF entities and can drive
two display pipelines at the same time. Refactor the VSP DRM code to
support that by introducing a vsp_drm_pipeline object that models one
display pipeline.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Acked-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

2 files changed, 141 insertions, 94 deletions

diff --git a/drivers/media/platform/vsp1/vsp1_drm.c b/drivers/media/platform/vsp1/vsp1_drm.c
index 4e1b893e8f51..7791d7b5a743 100644
--- a/drivers/media/platform/vsp1/vsp1_drm.c
+++ b/drivers/media/platform/vsp1/vsp1_drm.c
@@ -34,10 +34,10 @@
 
 static void vsp1_du_pipeline_frame_end(struct vsp1_pipeline *pipe)
 {
-	struct vsp1_drm *drm = to_vsp1_drm(pipe);
+	struct vsp1_drm_pipeline *drm_pipe = to_vsp1_drm_pipeline(pipe);
 
-	if (drm->du_complete)
-		drm->du_complete(drm->du_private);
+	if (drm_pipe->du_complete)
+		drm_pipe->du_complete(drm_pipe->du_private);
 }
 
 /* -----------------------------------------------------------------------------
@@ -80,15 +80,22 @@ int vsp1_du_setup_lif(struct device *dev, unsigned int pipe_index,
 		      const struct vsp1_du_lif_config *cfg)
 {
 	struct vsp1_device *vsp1 = dev_get_drvdata(dev);
-	struct vsp1_pipeline *pipe = &vsp1->drm->pipe;
-	struct vsp1_bru *bru = vsp1->bru;
+	struct vsp1_drm_pipeline *drm_pipe;
+	struct vsp1_pipeline *pipe;
+	struct vsp1_bru *bru;
 	struct v4l2_subdev_format format;
+	const char *bru_name;
 	unsigned int i;
 	int ret;
 
-	if (pipe_index > 0)
+	if (pipe_index >= vsp1->info->lif_count)
 		return -EINVAL;
 
+	drm_pipe = &vsp1->drm->pipe[pipe_index];
+	pipe = &drm_pipe->pipe;
+	bru = to_bru(&pipe->bru->subdev);
+	bru_name = pipe->bru->type == VSP1_ENTITY_BRU ? "BRU" : "BRS";
+
 	if (!cfg) {
 		/*
 		 * NULL configuration means the CRTC is being disabled, stop
@@ -100,14 +107,25 @@ int vsp1_du_setup_lif(struct device *dev, unsigned int pipe_index,
 
 		media_pipeline_stop(&pipe->output->entity.subdev.entity);
 
-		for (i = 0; i < bru->entity.source_pad; ++i) {
-			vsp1->drm->inputs[i].enabled = false;
-			bru->inputs[i].rpf = NULL;
+		for (i = 0; i < ARRAY_SIZE(pipe->inputs); ++i) {
+			struct vsp1_rwpf *rpf = pipe->inputs[i];
+
+			if (!rpf)
+				continue;
+
+			/*
+			 * Remove the RPF from the pipe and the list of BRU
+			 * inputs.
+			 */
+			WARN_ON(list_empty(&rpf->entity.list_pipe));
+			list_del_init(&rpf->entity.list_pipe);
 			pipe->inputs[i] = NULL;
+
+			bru->inputs[rpf->bru_input].rpf = NULL;
 		}
 
+		drm_pipe->du_complete = NULL;
 		pipe->num_inputs = 0;
-		vsp1->drm->du_complete = NULL;
 
 		vsp1_dlm_reset(pipe->output->dlm);
 		vsp1_device_put(vsp1);
@@ -117,8 +135,8 @@ int vsp1_du_setup_lif(struct device *dev, unsigned int pipe_index,
 		return 0;
 	}
 
-	dev_dbg(vsp1->dev, "%s: configuring LIF with format %ux%u\n",
-		__func__, cfg->width, cfg->height);
+	dev_dbg(vsp1->dev, "%s: configuring LIF%u with format %ux%u\n",
+		__func__, pipe_index, cfg->width, cfg->height);
 
 	/*
 	 * Configure the format at the BRU sinks and propagate it through the
@@ -127,7 +145,7 @@ int vsp1_du_setup_lif(struct device *dev, unsigned int pipe_index,
 	memset(&format, 0, sizeof(format));
 	format.which = V4L2_SUBDEV_FORMAT_ACTIVE;
 
-	for (i = 0; i < bru->entity.source_pad; ++i) {
+	for (i = 0; i < pipe->bru->source_pad; ++i) {
 		format.pad = i;
 
 		format.format.width = cfg->width;
@@ -135,60 +153,60 @@ int vsp1_du_setup_lif(struct device *dev, unsigned int pipe_index,
 		format.format.code = MEDIA_BUS_FMT_ARGB8888_1X32;
 		format.format.field = V4L2_FIELD_NONE;
 
-		ret = v4l2_subdev_call(&bru->entity.subdev, pad,
+		ret = v4l2_subdev_call(&pipe->bru->subdev, pad,
 				       set_fmt, NULL, &format);
 		if (ret < 0)
 			return ret;
 
-		dev_dbg(vsp1->dev, "%s: set format %ux%u (%x) on BRU pad %u\n",
+		dev_dbg(vsp1->dev, "%s: set format %ux%u (%x) on %s pad %u\n",
 			__func__, format.format.width, format.format.height,
-			format.format.code, i);
+			format.format.code, bru_name, i);
 	}
 
-	format.pad = bru->entity.source_pad;
+	format.pad = pipe->bru->source_pad;
 	format.format.width = cfg->width;
 	format.format.height = cfg->height;
 	format.format.code = MEDIA_BUS_FMT_ARGB8888_1X32;
 	format.format.field = V4L2_FIELD_NONE;
 
-	ret = v4l2_subdev_call(&bru->entity.subdev, pad, set_fmt, NULL,
+	ret = v4l2_subdev_call(&pipe->bru->subdev, pad, set_fmt, NULL,
 			       &format);
 	if (ret < 0)
 		return ret;
 
-	dev_dbg(vsp1->dev, "%s: set format %ux%u (%x) on BRU pad %u\n",
+	dev_dbg(vsp1->dev, "%s: set format %ux%u (%x) on %s pad %u\n",
 		__func__, format.format.width, format.format.height,
-		format.format.code, i);
+		format.format.code, bru_name, i);
 
 	format.pad = RWPF_PAD_SINK;
-	ret = v4l2_subdev_call(&vsp1->wpf[0]->entity.subdev, pad, set_fmt, NULL,
+	ret = v4l2_subdev_call(&pipe->output->entity.subdev, pad, set_fmt, NULL,
 			       &format);
 	if (ret < 0)
 		return ret;
 
-	dev_dbg(vsp1->dev, "%s: set format %ux%u (%x) on WPF0 sink\n",
+	dev_dbg(vsp1->dev, "%s: set format %ux%u (%x) on WPF%u sink\n",
 		__func__, format.format.width, format.format.height,
-		format.format.code);
+		format.format.code, pipe->output->entity.index);
 
 	format.pad = RWPF_PAD_SOURCE;
-	ret = v4l2_subdev_call(&vsp1->wpf[0]->entity.subdev, pad, get_fmt, NULL,
+	ret = v4l2_subdev_call(&pipe->output->entity.subdev, pad, get_fmt, NULL,
 			       &format);
 	if (ret < 0)
 		return ret;
 
-	dev_dbg(vsp1->dev, "%s: got format %ux%u (%x) on WPF0 source\n",
+	dev_dbg(vsp1->dev, "%s: got format %ux%u (%x) on WPF%u source\n",
 		__func__, format.format.width, format.format.height,
-		format.format.code);
+		format.format.code, pipe->output->entity.index);
 
 	format.pad = LIF_PAD_SINK;
-	ret = v4l2_subdev_call(&vsp1->lif[0]->entity.subdev, pad, set_fmt, NULL,
+	ret = v4l2_subdev_call(&pipe->lif->subdev, pad, set_fmt, NULL,
 			       &format);
 	if (ret < 0)
 		return ret;
 
-	dev_dbg(vsp1->dev, "%s: set format %ux%u (%x) on LIF sink\n",
+	dev_dbg(vsp1->dev, "%s: set format %ux%u (%x) on LIF%u sink\n",
 		__func__, format.format.width, format.format.height,
-		format.format.code);
+		format.format.code, pipe_index);
 
 	/*
 	 * Verify that the format at the output of the pipeline matches the
@@ -216,8 +234,8 @@ int vsp1_du_setup_lif(struct device *dev, unsigned int pipe_index,
 	 * Register a callback to allow us to notify the DRM driver of frame
 	 * completion events.
 	 */
-	vsp1->drm->du_complete = cfg->callback;
-	vsp1->drm->du_private = cfg->callback_data;
+	drm_pipe->du_complete = cfg->callback;
+	drm_pipe->du_private = cfg->callback_data;
 
 	ret = media_pipeline_start(&pipe->output->entity.subdev.entity,
 					  &pipe->pipe);
@@ -245,9 +263,9 @@ EXPORT_SYMBOL_GPL(vsp1_du_setup_lif);
 void vsp1_du_atomic_begin(struct device *dev, unsigned int pipe_index)
 {
 	struct vsp1_device *vsp1 = dev_get_drvdata(dev);
-	struct vsp1_pipeline *pipe = &vsp1->drm->pipe;
+	struct vsp1_drm_pipeline *drm_pipe = &vsp1->drm->pipe[pipe_index];
 
-	vsp1->drm->num_inputs = pipe->num_inputs;
+	drm_pipe->enabled = drm_pipe->pipe.num_inputs != 0;
 }
 EXPORT_SYMBOL_GPL(vsp1_du_atomic_begin);
 
@@ -286,6 +304,7 @@ int vsp1_du_atomic_update(struct device *dev, unsigned int pipe_index,
 			  const struct vsp1_du_atomic_config *cfg)
 {
 	struct vsp1_device *vsp1 = dev_get_drvdata(dev);
+	struct vsp1_drm_pipeline *drm_pipe = &vsp1->drm->pipe[pipe_index];
 	const struct vsp1_format_info *fmtinfo;
 	struct vsp1_rwpf *rpf;
 
@@ -298,7 +317,12 @@ int vsp1_du_atomic_update(struct device *dev, unsigned int pipe_index,
 		dev_dbg(vsp1->dev, "%s: RPF%u: disable requested\n", __func__,
 			rpf_index);
 
-		vsp1->drm->inputs[rpf_index].enabled = false;
+		/*
+		 * Remove the RPF from the pipe's inputs. The atomic flush
+		 * handler will disable the input and remove the entity from the
+		 * pipe's entities list.
+		 */
+		drm_pipe->pipe.inputs[rpf_index] = NULL;
 		return 0;
 	}
 
@@ -334,13 +358,15 @@ int vsp1_du_atomic_update(struct device *dev, unsigned int pipe_index,
 	vsp1->drm->inputs[rpf_index].crop = cfg->src;
 	vsp1->drm->inputs[rpf_index].compose = cfg->dst;
 	vsp1->drm->inputs[rpf_index].zpos = cfg->zpos;
-	vsp1->drm->inputs[rpf_index].enabled = true;
+
+	drm_pipe->pipe.inputs[rpf_index] = rpf;
 
 	return 0;
 }
 EXPORT_SYMBOL_GPL(vsp1_du_atomic_update);
 
 static int vsp1_du_setup_rpf_pipe(struct vsp1_device *vsp1,
+				  struct vsp1_pipeline *pipe,
 				  struct vsp1_rwpf *rpf, unsigned int bru_input)
 {
 	struct v4l2_subdev_selection sel;
@@ -414,7 +440,7 @@ static int vsp1_du_setup_rpf_pipe(struct vsp1_device *vsp1,
 	/* BRU sink, propagate the format from the RPF source. */
 	format.pad = bru_input;
 
-	ret = v4l2_subdev_call(&vsp1->bru->entity.subdev, pad, set_fmt, NULL,
+	ret = v4l2_subdev_call(&pipe->bru->subdev, pad, set_fmt, NULL,
 			       &format);
 	if (ret < 0)
 		return ret;
@@ -427,8 +453,8 @@ static int vsp1_du_setup_rpf_pipe(struct vsp1_device *vsp1,
 	sel.target = V4L2_SEL_TGT_COMPOSE;
 	sel.r = vsp1->drm->inputs[rpf->entity.index].compose;
 
-	ret = v4l2_subdev_call(&vsp1->bru->entity.subdev, pad, set_selection,
-			       NULL, &sel);
+	ret = v4l2_subdev_call(&pipe->bru->subdev, pad, set_selection, NULL,
+			       &sel);
 	if (ret < 0)
 		return ret;
 
@@ -453,14 +479,20 @@ static unsigned int rpf_zpos(struct vsp1_device *vsp1, struct vsp1_rwpf *rpf)
 void vsp1_du_atomic_flush(struct device *dev, unsigned int pipe_index)
 {
 	struct vsp1_device *vsp1 = dev_get_drvdata(dev);
-	struct vsp1_pipeline *pipe = &vsp1->drm->pipe;
+	struct vsp1_drm_pipeline *drm_pipe = &vsp1->drm->pipe[pipe_index];
+	struct vsp1_pipeline *pipe = &drm_pipe->pipe;
 	struct vsp1_rwpf *inputs[VSP1_MAX_RPF] = { NULL, };
+	struct vsp1_bru *bru = to_bru(&pipe->bru->subdev);
 	struct vsp1_entity *entity;
+	struct vsp1_entity *next;
 	struct vsp1_dl_list *dl;
+	const char *bru_name;
 	unsigned long flags;
 	unsigned int i;
 	int ret;
 
+	bru_name = pipe->bru->type == VSP1_ENTITY_BRU ? "BRU" : "BRS";
+
 	/* Prepare the display list. */
 	dl = vsp1_dl_list_get(pipe->output->dlm);
 
@@ -471,12 +503,8 @@ void vsp1_du_atomic_flush(struct device *dev, unsigned int pipe_index)
 		struct vsp1_rwpf *rpf = vsp1->rpf[i];
 		unsigned int j;
 
-		if (!vsp1->drm->inputs[i].enabled) {
-			pipe->inputs[i] = NULL;
+		if (!pipe->inputs[i])
 			continue;
-		}
-
-		pipe->inputs[i] = rpf;
 
 		/* Insert the RPF in the sorted RPFs array. */
 		for (j = pipe->num_inputs++; j > 0; --j) {
@@ -489,23 +517,26 @@ void vsp1_du_atomic_flush(struct device *dev, unsigned int pipe_index)
 	}
 
 	/* Setup the RPF input pipeline for every enabled input. */
-	for (i = 0; i < vsp1->info->num_bru_inputs; ++i) {
+	for (i = 0; i < pipe->bru->source_pad; ++i) {
 		struct vsp1_rwpf *rpf = inputs[i];
 
 		if (!rpf) {
-			vsp1->bru->inputs[i].rpf = NULL;
+			bru->inputs[i].rpf = NULL;
 			continue;
 		}
 
-		vsp1->bru->inputs[i].rpf = rpf;
+		if (list_empty(&rpf->entity.list_pipe))
+			list_add_tail(&rpf->entity.list_pipe, &pipe->entities);
+
+		bru->inputs[i].rpf = rpf;
 		rpf->bru_input = i;
-		rpf->entity.sink = &vsp1->bru->entity;
+		rpf->entity.sink = pipe->bru;
 		rpf->entity.sink_pad = i;
 
-		dev_dbg(vsp1->dev, "%s: connecting RPF.%u to BRU:%u\n",
-			__func__, rpf->entity.index, i);
+		dev_dbg(vsp1->dev, "%s: connecting RPF.%u to %s:%u\n",
+			__func__, rpf->entity.index, bru_name, i);
 
-		ret = vsp1_du_setup_rpf_pipe(vsp1, rpf, i);
+		ret = vsp1_du_setup_rpf_pipe(vsp1, pipe, rpf, i);
 		if (ret < 0)
 			dev_err(vsp1->dev,
 				"%s: failed to setup RPF.%u\n",
@@ -513,16 +544,16 @@ void vsp1_du_atomic_flush(struct device *dev, unsigned int pipe_index)
 	}
 
 	/* Configure all entities in the pipeline. */
-	list_for_each_entry(entity, &pipe->entities, list_pipe) {
+	list_for_each_entry_safe(entity, next, &pipe->entities, list_pipe) {
 		/* Disconnect unused RPFs from the pipeline. */
-		if (entity->type == VSP1_ENTITY_RPF) {
-			struct vsp1_rwpf *rpf = to_rwpf(&entity->subdev);
+		if (entity->type == VSP1_ENTITY_RPF &&
+		    !pipe->inputs[entity->index]) {
+			vsp1_dl_list_write(dl, entity->route->reg,
+					   VI6_DPR_NODE_UNUSED);
 
-			if (!pipe->inputs[rpf->entity.index]) {
-				vsp1_dl_list_write(dl, entity->route->reg,
-						   VI6_DPR_NODE_UNUSED);
-				continue;
-			}
+			list_del_init(&entity->list_pipe);
+
+			continue;
 		}
 
 		vsp1_entity_route_setup(entity, pipe, dl);
@@ -540,11 +571,11 @@ void vsp1_du_atomic_flush(struct device *dev, unsigned int pipe_index)
 	vsp1_dl_list_commit(dl);
 
 	/* Start or stop the pipeline if needed. */
-	if (!vsp1->drm->num_inputs && pipe->num_inputs) {
+	if (!drm_pipe->enabled && pipe->num_inputs) {
 		spin_lock_irqsave(&pipe->irqlock, flags);
 		vsp1_pipeline_run(pipe);
 		spin_unlock_irqrestore(&pipe->irqlock, flags);
-	} else if (vsp1->drm->num_inputs && !pipe->num_inputs) {
+	} else if (drm_pipe->enabled && !pipe->num_inputs) {
 		vsp1_pipeline_stop(pipe);
 	}
 }
@@ -579,39 +610,46 @@ EXPORT_SYMBOL_GPL(vsp1_du_unmap_sg);
 
 int vsp1_drm_init(struct vsp1_device *vsp1)
 {
-	struct vsp1_pipeline *pipe;
 	unsigned int i;
 
 	vsp1->drm = devm_kzalloc(vsp1->dev, sizeof(*vsp1->drm), GFP_KERNEL);
 	if (!vsp1->drm)
 		return -ENOMEM;
 
-	pipe = &vsp1->drm->pipe;
+	/* Create one DRM pipeline per LIF. */
+	for (i = 0; i < vsp1->info->lif_count; ++i) {
+		struct vsp1_drm_pipeline *drm_pipe = &vsp1->drm->pipe[i];
+		struct vsp1_pipeline *pipe = &drm_pipe->pipe;
 
-	vsp1_pipeline_init(pipe);
+		vsp1_pipeline_init(pipe);
 
-	/* The DRM pipeline is static, add entities manually. */
+		/*
+		 * The DRM pipeline is static, add entities manually. The first
+		 * pipeline uses the BRU and the second pipeline the BRS.
+		 */
+		pipe->bru = i == 0 ? &vsp1->bru->entity : &vsp1->brs->entity;
+		pipe->lif = &vsp1->lif[i]->entity;
+		pipe->output = vsp1->wpf[i];
+		pipe->output->pipe = pipe;
+		pipe->frame_end = vsp1_du_pipeline_frame_end;
+
+		pipe->bru->sink = &pipe->output->entity;
+		pipe->bru->sink_pad = 0;
+		pipe->output->entity.sink = pipe->lif;
+		pipe->output->entity.sink_pad = 0;
+
+		list_add_tail(&pipe->bru->list_pipe, &pipe->entities);
+		list_add_tail(&pipe->lif->list_pipe, &pipe->entities);
+		list_add_tail(&pipe->output->entity.list_pipe, &pipe->entities);
+	}
+
+	/* Disable all RPFs initially. */
 	for (i = 0; i < vsp1->info->rpf_count; ++i) {
 		struct vsp1_rwpf *input = vsp1->rpf[i];
 
-		list_add_tail(&input->entity.list_pipe, &pipe->entities);
+		INIT_LIST_HEAD(&input->entity.list_pipe);
 	}
 
-	vsp1->bru->entity.sink = &vsp1->wpf[0]->entity;
-	vsp1->bru->entity.sink_pad = 0;
-	vsp1->wpf[0]->entity.sink = &vsp1->lif[0]->entity;
-	vsp1->wpf[0]->entity.sink_pad = 0;
-
-	list_add_tail(&vsp1->bru->entity.list_pipe, &pipe->entities);
-	list_add_tail(&vsp1->wpf[0]->entity.list_pipe, &pipe->entities);
-	list_add_tail(&vsp1->lif[0]->entity.list_pipe, &pipe->entities);
-
-	pipe->bru = &vsp1->bru->entity;
-	pipe->lif = &vsp1->lif[0]->entity;
-	pipe->output = vsp1->wpf[0];
-	pipe->output->pipe = pipe;
-	pipe->frame_end = vsp1_du_pipeline_frame_end;
-
 	return 0;
 }
 
diff --git a/drivers/media/platform/vsp1/vsp1_drm.h b/drivers/media/platform/vsp1/vsp1_drm.h
index 67d6549edfad..fca553ddd184 100644
--- a/drivers/media/platform/vsp1/vsp1_drm.h
+++ b/drivers/media/platform/vsp1/vsp1_drm.h
@@ -18,32 +18,41 @@
 #include "vsp1_pipe.h"
 
 /**
- * vsp1_drm - State for the API exposed to the DRM driver
+ * vsp1_drm_pipeline - State for the API exposed to the DRM driver
  * @pipe: the VSP1 pipeline used for display
- * @num_inputs: number of active pipeline inputs at the beginning of an update
- * @inputs: source crop rectangle, destination compose rectangle and z-order
- *	position for every input
+ * @enabled: pipeline state at the beginning of an update
  * @du_complete: frame completion callback for the DU driver (optional)
  * @du_private: data to be passed to the du_complete callback
  */
-struct vsp1_drm {
+struct vsp1_drm_pipeline {
 	struct vsp1_pipeline pipe;
-	unsigned int num_inputs;
+	bool enabled;
+
+	/* Frame synchronisation */
+	void (*du_complete)(void *);
+	void *du_private;
+};
+
+/**
+ * vsp1_drm - State for the API exposed to the DRM driver
+ * @pipe: the VSP1 DRM pipeline used for display
+ * @inputs: source crop rectangle, destination compose rectangle and z-order
+ *	position for every input (indexed by RPF index)
+ */
+struct vsp1_drm {
+	struct vsp1_drm_pipeline pipe[VSP1_MAX_LIF];
+
 	struct {
-		bool enabled;
 		struct v4l2_rect crop;
 		struct v4l2_rect compose;
 		unsigned int zpos;
 	} inputs[VSP1_MAX_RPF];
-
-	/* Frame synchronisation */
-	void (*du_complete)(void *);
-	void *du_private;
 };
 
-static inline struct vsp1_drm *to_vsp1_drm(struct vsp1_pipeline *pipe)
+static inline struct vsp1_drm_pipeline *
+to_vsp1_drm_pipeline(struct vsp1_pipeline *pipe)
 {
-	return container_of(pipe, struct vsp1_drm, pipe);
+	return container_of(pipe, struct vsp1_drm_pipeline, pipe);
 }
 
 int vsp1_drm_init(struct vsp1_device *vsp1);