media: rcar-vin: Add r8a779a0 support

Add support for the R-Car V3U (r8a779a0) to the driver. The V3U has the
VIN modules connected to a ISP instead of directly to the R-Car CSI-2
receivers. The reason being that the ISP performs channel selection
based on CSI-2 VC/DT pairs and routes the video data to different VIN
modules. In other SoC versions this filtering is done by the VIN modules
themself.

While the media graph is very different from other SoCs the only
difference in operating the VIN modules is that the VC/DT filtering
should be skipped as that is performed by the ISP.

Signed-off-by: Niklas Söderlund <[e-mail]>
Reviewed-by: Jacopo Mondi <[e-mail]>
Signed-off-by: Sakari Ailus <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

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

···
 }
 
 /* -----------------------------------------------------------------------------
+ * ISP
+ */
+
+static int rvin_isp_setup_links(struct rvin_dev *vin)
+{
+	unsigned int i;
+	int ret = -EINVAL;
+
+	/* Create all media device links between VINs and ISP's. */
+	mutex_lock(&vin->group->lock);
+	for (i = 0; i < RCAR_VIN_NUM; i++) {
+		struct media_pad *source_pad, *sink_pad;
+		struct media_entity *source, *sink;
+		unsigned int source_slot = i / 8;
+		unsigned int source_idx = i % 8 + 1;
+
+		if (!vin->group->vin[i])
+			continue;
+
+		/* Check that ISP is part of the group. */
+		if (!vin->group->remotes[source_slot].subdev)
+			continue;
+
+		source = &vin->group->remotes[source_slot].subdev->entity;
+		source_pad = &source->pads[source_idx];
+
+		sink = &vin->group->vin[i]->vdev.entity;
+		sink_pad = &sink->pads[0];
+
+		/* Skip if link already exists. */
+		if (media_entity_find_link(source_pad, sink_pad))
+			continue;
+
+		ret = media_create_pad_link(source, source_idx, sink, 0,
+					    MEDIA_LNK_FL_ENABLED |
+					    MEDIA_LNK_FL_IMMUTABLE);
+		if (ret) {
+			vin_err(vin, "Error adding link from %s to %s\n",
+				source->name, sink->name);
+			break;
+		}
+	}
+	mutex_unlock(&vin->group->lock);
+
+	return ret;
+}
+
+static void rvin_isp_cleanup(struct rvin_dev *vin)
+{
+	rvin_group_notifier_cleanup(vin);
+	rvin_group_put(vin);
+	rvin_free_controls(vin);
+}
+
+static int rvin_isp_init(struct rvin_dev *vin)
+{
+	int ret;
+
+	vin->pad.flags = MEDIA_PAD_FL_SINK;
+	ret = media_entity_pads_init(&vin->vdev.entity, 1, &vin->pad);
+	if (ret)
+		return ret;
+
+	ret = rvin_create_controls(vin, NULL);
+	if (ret < 0)
+		return ret;
+
+	ret = rvin_group_get(vin, rvin_isp_setup_links, NULL);
+	if (ret)
+		goto err_controls;
+
+	ret = rvin_group_notifier_init(vin, 2, RVIN_ISP_MAX);
+	if (ret)
+		goto err_group;
+
+	return 0;
+err_group:
+	rvin_group_put(vin);
+err_controls:
+	rvin_free_controls(vin);
+
+	return ret;
+}
+
+/* -----------------------------------------------------------------------------
  * Suspend / Resume
  */
 
···
 	.routes = rcar_info_r8a77995_routes,
 };
 
+static const struct rvin_info rcar_info_r8a779a0 = {
+	.model = RCAR_GEN3,
+	.use_mc = true,
+	.use_isp = true,
+	.nv12 = true,
+	.max_width = 4096,
+	.max_height = 4096,
+};
+
 static const struct of_device_id rvin_of_id_table[] = {
 	{
 		.compatible = "renesas,vin-r8a774a1",
···
 		.compatible = "renesas,vin-r8a77995",
 		.data = &rcar_info_r8a77995,
 	},
+	{
+		.compatible = "renesas,vin-r8a779a0",
+		.data = &rcar_info_r8a779a0,
+	},
 	{ /* Sentinel */ },
 };
 MODULE_DEVICE_TABLE(of, rvin_of_id_table);
···
 
 	platform_set_drvdata(pdev, vin);
 
-	if (vin->info->use_mc)
+	if (vin->info->use_isp)
+		ret = rvin_isp_init(vin);
+	else if (vin->info->use_mc)
 		ret = rvin_csi2_init(vin);
 	else
 		ret = rvin_parallel_init(vin);
···
 
 	rvin_v4l2_unregister(vin);
 
-	if (vin->info->use_mc)
+	if (vin->info->use_isp)
+		rvin_isp_cleanup(vin);
+	else if (vin->info->use_mc)
 		rvin_csi2_cleanup(vin);
 	else
 		rvin_parallel_cleanup(vin);

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

···
 	/* Always update on field change */
 	vnmc |= VNMC_VUP;
 
-	/* If input and output use the same colorspace, use bypass mode */
-	if (input_is_yuv == output_is_yuv)
-		vnmc |= VNMC_BPS;
+	if (!vin->info->use_isp) {
+		/* If input and output use the same colorspace, use bypass mode */
+		if (input_is_yuv == output_is_yuv)
+			vnmc |= VNMC_BPS;
 
-	if (vin->info->model == RCAR_GEN3) {
-		/* Select between CSI-2 and parallel input */
-		if (vin->is_csi)
-			vnmc &= ~VNMC_DPINE;
-		else
-			vnmc |= VNMC_DPINE;
+		if (vin->info->model == RCAR_GEN3) {
+			/* Select between CSI-2 and parallel input */
+			if (vin->is_csi)
+				vnmc &= ~VNMC_DPINE;
+			else
+				vnmc |= VNMC_DPINE;
+		}
 	}
 
 	/* Progressive or interlaced mode */

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

···
 #define HW_BUFFER_MASK 0x7f
 
 /* Max number on VIN instances that can be in a system */
-#define RCAR_VIN_NUM 8
+#define RCAR_VIN_NUM 32
 
 struct rvin_group;
 
···
 	RVIN_CSI_MAX,
 };
 
-#define RVIN_REMOTES_MAX RVIN_CSI_MAX
+enum rvin_isp_id {
+	RVIN_ISP0,
+	RVIN_ISP1,
+	RVIN_ISP2,
+	RVIN_ISP4,
+	RVIN_ISP_MAX,
+};
+
+#define RVIN_REMOTES_MAX \
+	(((unsigned int)RVIN_CSI_MAX) > ((unsigned int)RVIN_ISP_MAX) ? \
+	 RVIN_CSI_MAX : RVIN_ISP_MAX)
 
 /**
  * enum rvin_dma_state - DMA states
···
  * struct rvin_info - Information about the particular VIN implementation
  * @model:		VIN model
  * @use_mc:		use media controller instead of controlling subdevice
+ * @use_isp:		the VIN is connected to the ISP and not to the CSI-2
  * @nv12:		support outputing NV12 pixel format
  * @max_width:		max input width the VIN supports
  * @max_height:		max input height the VIN supports
···
 struct rvin_info {
 	enum model_id model;
 	bool use_mc;
+	bool use_isp;
 	bool nv12;
 
 	unsigned int max_width;