linux-kernel - [PATCH v3 13/17] media: rzg2l-cru: video: Implement .link

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Message-ID: <20241001140919.206139-14-prabhakar.mahadev-lad.rj@bp.renesas.com>
Date: Tue,  1 Oct 2024 15:09:15 +0100
From: Prabhakar <prabhakar.csengg@...il.com>
To: Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
	Sakari Ailus <sakari.ailus@...ux.intel.com>,
	Mauro Carvalho Chehab <mchehab@...nel.org>,
	Hans Verkuil <hverkuil-cisco@...all.nl>
Cc: linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-renesas-soc@...r.kernel.org,
	Prabhakar <prabhakar.csengg@...il.com>,
	Biju Das <biju.das.jz@...renesas.com>,
	Fabrizio Castro <fabrizio.castro.jz@...esas.com>,
	Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: [PATCH v3 13/17] media: rzg2l-cru: video: Implement .link_validate() callback

From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>

Implement the `.link_validate()` callback for the video node and move the
format checking into this function. This change allows the removal of
`rzg2l_cru_mc_validate_format()`.

Suggested-by: Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
---
v2->v3
- New patch
---
 .../platform/renesas/rzg2l-cru/rzg2l-video.c  | 99 ++++++++++---------
 1 file changed, 55 insertions(+), 44 deletions(-)

diff --git a/drivers/media/platform/renesas/rzg2l-cru/rzg2l-video.c b/drivers/media/platform/renesas/rzg2l-cru/rzg2l-video.c
index ceb9012c9d70..c6c82b9b130a 100644
--- a/drivers/media/platform/renesas/rzg2l-cru/rzg2l-video.c
+++ b/drivers/media/platform/renesas/rzg2l-cru/rzg2l-video.c
@@ -189,46 +189,6 @@ static void rzg2l_cru_buffer_queue(struct vb2_buffer *vb)
 	spin_unlock_irqrestore(&cru->qlock, flags);
 }
 
-static int rzg2l_cru_mc_validate_format(struct rzg2l_cru_dev *cru,
-					struct v4l2_subdev *sd,
-					struct media_pad *pad)
-{
-	struct v4l2_subdev_format fmt = {
-		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
-	};
-
-	fmt.pad = pad->index;
-	if (v4l2_subdev_call_state_active(sd, pad, get_fmt, &fmt))
-		return -EPIPE;
-
-	switch (fmt.format.code) {
-	case MEDIA_BUS_FMT_UYVY8_1X16:
-		break;
-	default:
-		return -EPIPE;
-	}
-
-	switch (fmt.format.field) {
-	case V4L2_FIELD_TOP:
-	case V4L2_FIELD_BOTTOM:
-	case V4L2_FIELD_NONE:
-	case V4L2_FIELD_INTERLACED_TB:
-	case V4L2_FIELD_INTERLACED_BT:
-	case V4L2_FIELD_INTERLACED:
-	case V4L2_FIELD_SEQ_TB:
-	case V4L2_FIELD_SEQ_BT:
-		break;
-	default:
-		return -EPIPE;
-	}
-
-	if (fmt.format.width != cru->format.width ||
-	    fmt.format.height != cru->format.height)
-		return -EPIPE;
-
-	return 0;
-}
-
 static void rzg2l_cru_set_slot_addr(struct rzg2l_cru_dev *cru,
 				    int slot, dma_addr_t addr)
 {
@@ -531,10 +491,6 @@ static int rzg2l_cru_set_stream(struct rzg2l_cru_dev *cru, int on)
 		return stream_off_ret;
 	}
 
-	ret = rzg2l_cru_mc_validate_format(cru, sd, pad);
-	if (ret)
-		return ret;
-
 	pipe = media_entity_pipeline(&sd->entity) ? : &cru->vdev.pipe;
 	ret = video_device_pipeline_start(&cru->vdev, pipe);
 	if (ret)
@@ -995,6 +951,60 @@ static const struct v4l2_file_operations rzg2l_cru_fops = {
 	.read		= vb2_fop_read,
 };
 
+/* -----------------------------------------------------------------------------
+ * Media entity operations
+ */
+
+static int rzg2l_cru_video_link_validate(struct media_link *link)
+{
+	struct v4l2_subdev_format fmt = {
+		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
+	};
+	struct v4l2_subdev *subdev;
+	struct media_entity *entity;
+	struct rzg2l_cru_dev *cru;
+	struct media_pad *remote;
+	int ret;
+
+	entity = link->sink->entity;
+	remote = link->source;
+
+	subdev = media_entity_to_v4l2_subdev(remote->entity);
+	fmt.pad = remote->index;
+	ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &fmt);
+	if (ret < 0)
+		return ret == -ENOIOCTLCMD ? -EINVAL : ret;
+
+	if (!rzg2l_cru_ip_code_to_fmt(fmt.format.code))
+		return -EPIPE;
+
+	switch (fmt.format.field) {
+	case V4L2_FIELD_TOP:
+	case V4L2_FIELD_BOTTOM:
+	case V4L2_FIELD_NONE:
+	case V4L2_FIELD_INTERLACED_TB:
+	case V4L2_FIELD_INTERLACED_BT:
+	case V4L2_FIELD_INTERLACED:
+	case V4L2_FIELD_SEQ_TB:
+	case V4L2_FIELD_SEQ_BT:
+		break;
+	default:
+		return -EPIPE;
+	}
+
+	cru = container_of(media_entity_to_video_device(entity),
+			   struct rzg2l_cru_dev, vdev);
+	if (fmt.format.width != cru->format.width ||
+	    fmt.format.height != cru->format.height)
+		return -EPIPE;
+
+	return 0;
+}
+
+static const struct media_entity_operations rzg2l_cru_video_media_ops = {
+	.link_validate = rzg2l_cru_video_link_validate,
+};
+
 static void rzg2l_cru_v4l2_init(struct rzg2l_cru_dev *cru)
 {
 	struct video_device *vdev = &cru->vdev;
@@ -1006,6 +1016,7 @@ static void rzg2l_cru_v4l2_init(struct rzg2l_cru_dev *cru)
 	vdev->lock = &cru->lock;
 	vdev->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
 	vdev->device_caps |= V4L2_CAP_IO_MC;
+	vdev->entity.ops = &rzg2l_cru_video_media_ops;
 	vdev->fops = &rzg2l_cru_fops;
 	vdev->ioctl_ops = &rzg2l_cru_ioctl_ops;
 
-- 
2.43.0