linux-kernel - [PATCH v3 08/13] media: ti: j721e-csi2rx: add support for processing virtual channels

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Message-ID: <20250417065554.437541-9-r-donadkar@ti.com>
Date: Thu, 17 Apr 2025 12:25:49 +0530
From: Rishikesh Donadkar <r-donadkar@...com>
To: <jai.luthra@...ux.dev>, <mripard@...nel.org>
CC: <linux-kernel@...r.kernel.org>, <linux-media@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <r-donadkar@...com>, <devarsht@...com>,
        <y-abhilashchandra@...com>, <mchehab@...nel.org>, <robh@...nel.org>,
        <krzk+dt@...nel.org>, <conor+dt@...nel.org>, <vaishnav.a@...com>,
        <s-jain1@...com>, <vigneshr@...com>, <sakari.ailus@...ux.intel.com>,
        <hverkuil-cisco@...all.nl>, <tomi.valkeinen@...asonboard.com>,
        <jai.luthra@...asonboard.com>, <changhuang.liang@...rfivetech.com>,
        <jack.zhu@...rfivetech.com>, <laurent.pinchart@...asonboard.com>
Subject: [PATCH v3 08/13] media: ti: j721e-csi2rx: add support for processing virtual channels

From: Jai Luthra <j-luthra@...com>

Use get_frame_desc() to get the frame desc from the connected source,
and use the provided virtual channel instead of hardcoded one.

get_frame_desc() works per stream, but as we don't support multiple
streams yet, we will just always use stream 0. If the source doesn't
support get_frame_desc(), fall back to the previous method of always
capturing virtual channel 0.

Co-developed-by: Pratyush Yadav <p.yadav@...com>
Signed-off-by: Pratyush Yadav <p.yadav@...com>
Signed-off-by: Jai Luthra <j-luthra@...com>
Signed-off-by: Rishikesh Donadkar <r-donadkar@...com>
---
 .../platform/ti/j721e-csi2rx/j721e-csi2rx.c   | 39 +++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/drivers/media/platform/ti/j721e-csi2rx/j721e-csi2rx.c b/drivers/media/platform/ti/j721e-csi2rx/j721e-csi2rx.c
index e85d04d7c2ff9..3e2a0517a9096 100644
--- a/drivers/media/platform/ti/j721e-csi2rx/j721e-csi2rx.c
+++ b/drivers/media/platform/ti/j721e-csi2rx/j721e-csi2rx.c
@@ -29,6 +29,7 @@
 #define SHIM_DMACNTX_EN			BIT(31)
 #define SHIM_DMACNTX_YUV422		GENMASK(27, 26)
 #define SHIM_DMACNTX_SIZE		GENMASK(21, 20)
+#define SHIM_DMACNTX_VC			GENMASK(9, 6)
 #define SHIM_DMACNTX_FMT		GENMASK(5, 0)
 #define SHIM_DMACNTX_YUV422_MODE_11	3
 #define SHIM_DMACNTX_SIZE_8		0
@@ -105,6 +106,8 @@ struct ti_csi2rx_ctx {
 	struct media_pad		pad;
 	u32				sequence;
 	u32				idx;
+	u32				vc;
+	u32				stream;
 };
 
 struct ti_csi2rx_dev {
@@ -573,6 +576,7 @@ static void ti_csi2rx_setup_shim(struct ti_csi2rx_ctx *ctx)
 	}
 
 	reg |= FIELD_PREP(SHIM_DMACNTX_SIZE, fmt->size);
+	reg |= FIELD_PREP(SHIM_DMACNTX_VC, ctx->vc);
 
 	writel(reg, csi->shim + SHIM_DMACNTX(ctx->idx));
 
@@ -846,6 +850,33 @@ static void ti_csi2rx_buffer_queue(struct vb2_buffer *vb)
 	}
 }
 
+static int ti_csi2rx_get_vc(struct ti_csi2rx_ctx *ctx)
+{
+	struct ti_csi2rx_dev *csi = ctx->csi;
+	struct v4l2_mbus_frame_desc fd;
+	struct media_pad *pad;
+	int ret, i;
+
+	pad = media_entity_remote_pad_unique(&csi->subdev.entity, MEDIA_PAD_FL_SOURCE);
+	if (!pad)
+		return -ENODEV;
+
+	ret = v4l2_subdev_call(csi->source, pad, get_frame_desc, pad->index,
+			       &fd);
+	if (ret)
+		return ret;
+
+	if (fd.type != V4L2_MBUS_FRAME_DESC_TYPE_CSI2)
+		return -EINVAL;
+
+	for (i = 0; i < fd.num_entries; i++) {
+		if (ctx->stream == fd.entry[i].stream)
+			return fd.entry[i].bus.csi2.vc;
+	}
+
+	return -ENODEV;
+}
+
 static int ti_csi2rx_start_streaming(struct vb2_queue *vq, unsigned int count)
 {
 	struct ti_csi2rx_ctx *ctx = vb2_get_drv_priv(vq);
@@ -866,6 +897,14 @@ static int ti_csi2rx_start_streaming(struct vb2_queue *vq, unsigned int count)
 	if (ret)
 		goto err;
 
+	ret = ti_csi2rx_get_vc(ctx);
+	if (ret == -ENOIOCTLCMD)
+		ctx->vc = 0;
+	else if (ret < 0)
+		goto err;
+	else
+		ctx->vc = ret;
+
 	ti_csi2rx_setup_shim(ctx);
 
 	ctx->sequence = 0;
-- 
2.34.1