linux-kernel - [PATCH 2/3] media: platform: rzg2l-cru: rzg2l-video: Retrieve virtual channel information

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Message-Id: <20240906173947.282402-3-prabhakar.mahadev-lad.rj@bp.renesas.com>
Date: Fri,  6 Sep 2024 18:39:46 +0100
From: Prabhakar <prabhakar.csengg@...il.com>
To: Sakari Ailus <sakari.ailus@...ux.intel.com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.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 2/3] media: platform: rzg2l-cru: rzg2l-video: Retrieve virtual channel information

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

The RZ/G2L CRU needs to configure the ICnMC.VCSEL bits to specify which
virtual channel should be processed from the four available VCs. To
retrieve this information from the connected subdevice, the
.get_frame_desc() function is called.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
---
 .../platform/renesas/rzg2l-cru/rzg2l-video.c  | 29 +++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/drivers/media/platform/renesas/rzg2l-cru/rzg2l-video.c b/drivers/media/platform/renesas/rzg2l-cru/rzg2l-video.c
index bbf4674f888d..6101a070e785 100644
--- a/drivers/media/platform/renesas/rzg2l-cru/rzg2l-video.c
+++ b/drivers/media/platform/renesas/rzg2l-cru/rzg2l-video.c
@@ -433,12 +433,41 @@ void rzg2l_cru_stop_image_processing(struct rzg2l_cru_dev *cru)
 	spin_unlock_irqrestore(&cru->qlock, flags);
 }
 
+static int rzg2l_cru_get_virtual_channel(struct rzg2l_cru_dev *cru)
+{
+	struct v4l2_mbus_frame_desc fd = { };
+	struct media_pad *pad;
+	int ret;
+
+	pad = media_pad_remote_pad_unique(&cru->ip.pads[1]);
+	if (IS_ERR(pad))
+		return PTR_ERR(pad);
+
+	ret = v4l2_subdev_call(cru->ip.remote, pad, get_frame_desc,
+			       pad->index, &fd);
+	if (ret < 0 && ret != -ENOIOCTLCMD)
+		return ret;
+	/* If remote subdev does not implement .get_frame_desc default to VC0. */
+	if (ret == -ENOIOCTLCMD)
+		return 0;
+
+	if (fd.type != V4L2_MBUS_FRAME_DESC_TYPE_CSI2)
+		return -EINVAL;
+
+	return fd.num_entries ? fd.entry[0].bus.csi2.vc : 0;
+}
+
 int rzg2l_cru_start_image_processing(struct rzg2l_cru_dev *cru)
 {
 	struct v4l2_mbus_framefmt *fmt = rzg2l_cru_ip_get_src_fmt(cru);
 	unsigned long flags;
 	int ret;
 
+	ret = rzg2l_cru_get_virtual_channel(cru);
+	if (ret < 0)
+		return ret;
+	cru->csi.channel = ret;
+
 	spin_lock_irqsave(&cru->qlock, flags);
 
 	/* Select a video input */
-- 
2.34.1