media: rcar-vin: Cache the mbus configuration flags

Media bus configuration flags and media bus type were so far a property
of each VIN instance, as the subdevice they were connected to was
immutable during the whole system life time.

With the forth-coming introduction of parallel input devices support,
a VIN instance can have the subdevice it is connected to switched at
runtime, from a CSI-2 subdevice to a parallel one and viceversa, through
the modification of links between media entities in the media controller
graph. To avoid discarding the per-subdevice configuration flags retrieved by
v4l2_fwnode parsing facilities, cache them in the 'rvin_graph_entity'
member of each VIN instance, opportunely renamed to 'rvin_parallel_entity'.

Also modify the register configuration function to take mbus flags into
account when running on a bus type that supports them.

The media bus type currently in use will be updated in a follow-up patch
to the link state change notification function.

Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
Acked-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/media/platform/rcar-vin/rcar-core.c

@@ -524,30 +524,29 @@ static int rvin_parallel_parse_v4l2(struct device *dev,
 				    struct v4l2_async_subdev *asd)
 {
 	struct rvin_dev *vin = dev_get_drvdata(dev);
-	struct rvin_graph_entity *rvge =
-		container_of(asd, struct rvin_graph_entity, asd);
+	struct rvin_parallel_entity *rvpe =
+		container_of(asd, struct rvin_parallel_entity, asd);
 
 	if (vep->base.port || vep->base.id)
 		return -ENOTCONN;
 
-	vin->mbus_cfg.type = vep->bus_type;
+	vin->parallel = rvpe;
+	vin->parallel->mbus_type = vep->bus_type;
 
-	switch (vin->mbus_cfg.type) {
+	switch (vin->parallel->mbus_type) {
 	case V4L2_MBUS_PARALLEL:
 		vin_dbg(vin, "Found PARALLEL media bus\n");
-		vin->mbus_cfg.flags = vep->bus.parallel.flags;
+		vin->parallel->mbus_flags = vep->bus.parallel.flags;
 		break;
 	case V4L2_MBUS_BT656:
 		vin_dbg(vin, "Found BT656 media bus\n");
-		vin->mbus_cfg.flags = 0;
+		vin->parallel->mbus_flags = 0;
 		break;
 	default:
 		vin_err(vin, "Unknown media bus type\n");
 		return -EINVAL;
 	}
 
-	vin->parallel = rvge;
-
 	return 0;
 }
 
@@ -557,7 +556,7 @@ static int rvin_parallel_graph_init(struct rvin_dev *vin)
 
 	ret = v4l2_async_notifier_parse_fwnode_endpoints(
 		vin->dev, &vin->notifier,
-		sizeof(struct rvin_graph_entity), rvin_parallel_parse_v4l2);
+		sizeof(struct rvin_parallel_entity), rvin_parallel_parse_v4l2);
 	if (ret)
 		return ret;
 
@@ -785,10 +784,6 @@ static int rvin_mc_init(struct rvin_dev *vin)
 {
 	int ret;
 
-	/* All our sources are CSI-2 */
-	vin->mbus_cfg.type = V4L2_MBUS_CSI2;
-	vin->mbus_cfg.flags = 0;
-
 	vin->pad.flags = MEDIA_PAD_FL_SINK;
 	ret = media_entity_pads_init(&vin->vdev.entity, 1, &vin->pad);
 	if (ret)

drivers/media/platform/rcar-vin/rcar-dma.c

@@ -659,8 +659,12 @@ static int rvin_setup(struct rvin_dev *vin)
 		break;
 	case MEDIA_BUS_FMT_UYVY8_2X8:
 		/* BT.656 8bit YCbCr422 or BT.601 8bit YCbCr422 */
-		vnmc |= vin->mbus_cfg.type == V4L2_MBUS_BT656 ?
-			VNMC_INF_YUV8_BT656 : VNMC_INF_YUV8_BT601;
+		if (!vin->is_csi &&
+		    vin->parallel->mbus_type == V4L2_MBUS_BT656)
+			vnmc |= VNMC_INF_YUV8_BT656;
+		else
+			vnmc |= VNMC_INF_YUV8_BT601;
+
 		input_is_yuv = true;
 		break;
 	case MEDIA_BUS_FMT_RGB888_1X24:
@@ -668,8 +672,12 @@ static int rvin_setup(struct rvin_dev *vin)
 		break;
 	case MEDIA_BUS_FMT_UYVY10_2X10:
 		/* BT.656 10bit YCbCr422 or BT.601 10bit YCbCr422 */
-		vnmc |= vin->mbus_cfg.type == V4L2_MBUS_BT656 ?
-			VNMC_INF_YUV10_BT656 : VNMC_INF_YUV10_BT601;
+		if (!vin->is_csi &&
+		    vin->parallel->mbus_type == V4L2_MBUS_BT656)
+			vnmc |= VNMC_INF_YUV10_BT656;
+		else
+			vnmc |= VNMC_INF_YUV10_BT601;
+
 		input_is_yuv = true;
 		break;
 	default:
@@ -682,13 +690,15 @@ static int rvin_setup(struct rvin_dev *vin)
 	else
 		dmr2 = VNDMR2_FTEV | VNDMR2_VLV(1);
 
-	/* Hsync Signal Polarity Select */
-	if (!(vin->mbus_cfg.flags & V4L2_MBUS_HSYNC_ACTIVE_LOW))
-		dmr2 |= VNDMR2_HPS;
+	if (!vin->is_csi) {
+		/* Hsync Signal Polarity Select */
+		if (!(vin->parallel->mbus_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW))
+			dmr2 |= VNDMR2_HPS;
 
-	/* Vsync Signal Polarity Select */
-	if (!(vin->mbus_cfg.flags & V4L2_MBUS_VSYNC_ACTIVE_LOW))
-		dmr2 |= VNDMR2_VPS;
+		/* Vsync Signal Polarity Select */
+		if (!(vin->parallel->mbus_flags & V4L2_MBUS_VSYNC_ACTIVE_LOW))
+			dmr2 |= VNDMR2_VPS;
+	}
 
 	/*
 	 * Output format
@@ -734,7 +744,7 @@ static int rvin_setup(struct rvin_dev *vin)
 
 	if (vin->info->model == RCAR_GEN3) {
 		/* Select between CSI-2 and parallel input */
-		if (vin->mbus_cfg.type == V4L2_MBUS_CSI2)
+		if (vin->is_csi)
 			vnmc &= ~VNMC_DPINE;
 		else
 			vnmc |= VNMC_DPINE;

drivers/media/platform/rcar-vin/rcar-vin.h

@@ -75,16 +75,22 @@ struct rvin_video_format {
 };
 
 /**
- * struct rvin_graph_entity - Video endpoint from async framework
+ * struct rvin_parallel_entity - Parallel video input endpoint descriptor
  * @asd:	sub-device descriptor for async framework
  * @subdev:	subdevice matched using async framework
+ * @mbus_type:	media bus type
+ * @mbus_flags:	media bus configuration flags
  * @source_pad:	source pad of remote subdevice
  * @sink_pad:	sink pad of remote subdevice
+ *
  */
-struct rvin_graph_entity {
+struct rvin_parallel_entity {
 	struct v4l2_async_subdev asd;
 	struct v4l2_subdev *subdev;
 
+	enum v4l2_mbus_type mbus_type;
+	unsigned int mbus_flags;
+
 	unsigned int source_pad;
 	unsigned int sink_pad;
 };
@@ -148,7 +154,8 @@ struct rvin_info {
  * @v4l2_dev:		V4L2 device
  * @ctrl_handler:	V4L2 control handler
  * @notifier:		V4L2 asynchronous subdevs notifier
- * @parallel:		entity in the DT for local parallel subdevice
+ *
+ * @parallel:		parallel input subdevice descriptor
  *
  * @group:		Gen3 CSI group
  * @id:			Gen3 group id for this VIN
@@ -166,7 +173,8 @@ struct rvin_info {
  * @sequence:		V4L2 buffers sequence number
  * @state:		keeps track of operation state
  *
- * @mbus_cfg:		media bus configuration from DT
+ * @is_csi:		flag to mark the VIN as using a CSI-2 subdevice
+ *
  * @mbus_code:		media bus format code
  * @format:		active V4L2 pixel format
  *
@@ -184,7 +192,8 @@ struct rvin_dev {
 	struct v4l2_device v4l2_dev;
 	struct v4l2_ctrl_handler ctrl_handler;
 	struct v4l2_async_notifier notifier;
-	struct rvin_graph_entity *parallel;
+
+	struct rvin_parallel_entity *parallel;
 
 	struct rvin_group *group;
 	unsigned int id;
@@ -201,7 +210,8 @@ struct rvin_dev {
 	unsigned int sequence;
 	enum rvin_dma_state state;
 
-	struct v4l2_mbus_config mbus_cfg;
+	bool is_csi;
+
 	u32 mbus_code;
 	struct v4l2_pix_format format;