[PATCH v3 37/38] media: ti-vpe: cal: use frame desc to get vc and dt

[Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>]

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

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 and any datatype.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
---
 drivers/media/platform/ti-vpe/cal-camerarx.c | 26 +++++++++++
 drivers/media/platform/ti-vpe/cal.c          | 49 +++++++++++++++++++-
 drivers/media/platform/ti-vpe/cal.h          |  3 ++
 3 files changed, 76 insertions(+), 2 deletions(-)

diff --git a/drivers/media/platform/ti-vpe/cal-camerarx.c b/drivers/media/platform/ti-vpe/cal-camerarx.c
index e3a4c20be1e6..cb6a37f47432 100644
--- a/drivers/media/platform/ti-vpe/cal-camerarx.c
+++ b/drivers/media/platform/ti-vpe/cal-camerarx.c
@@ -583,6 +583,32 @@ static int cal_camerarx_parse_dt(struct cal_camerarx *phy)
 	return ret;
 }
 
+int cal_camerarx_get_remote_frame_desc(struct cal_camerarx *phy,
+				       struct v4l2_mbus_frame_desc *fd)
+{
+	struct media_pad *pad;
+	int ret;
+
+	if (!phy->source)
+		return -ENODEV;
+
+	pad = media_entity_remote_pad(&phy->pads[CAL_CAMERARX_PAD_SINK]);
+	if (!pad)
+		return -ENODEV;
+
+	ret = v4l2_subdev_call(phy->source, pad, get_frame_desc, pad->index,
+			       fd);
+	if (ret)
+		return ret;
+
+	if (fd->type != V4L2_MBUS_FRAME_DESC_TYPE_CSI2) {
+		dev_err(phy->cal->dev, "Frame desc do not describe CSI-2 link");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
 /* ------------------------------------------------------------------
  *	V4L2 Subdev Operations
  * ------------------------------------------------------------------
diff --git a/drivers/media/platform/ti-vpe/cal.c b/drivers/media/platform/ti-vpe/cal.c
index fcc81024ae18..7975bb449acd 100644
--- a/drivers/media/platform/ti-vpe/cal.c
+++ b/drivers/media/platform/ti-vpe/cal.c
@@ -469,10 +469,56 @@ static bool cal_ctx_wr_dma_stopped(struct cal_ctx *ctx)
 	return stopped;
 }
 
+static int
+cal_get_remote_frame_desc_entry(struct cal_camerarx *phy, u32 stream,
+				struct v4l2_mbus_frame_desc_entry *entry)
+{
+	struct v4l2_mbus_frame_desc fd;
+	unsigned int i;
+	int ret;
+
+	ret = cal_camerarx_get_remote_frame_desc(phy, &fd);
+	if (ret) {
+		if (ret != -ENOIOCTLCMD)
+			dev_err(phy->cal->dev,
+				"Failed to get remote frame desc: %d\n", ret);
+		return ret;
+	}
+
+	for (i = 0; i < fd.num_entries; i++) {
+		if (stream == fd.entry[i].stream) {
+			*entry = fd.entry[i];
+			return 0;
+		}
+	}
+
+	return -ENODEV;
+}
+
 int cal_ctx_prepare(struct cal_ctx *ctx)
 {
+	struct v4l2_mbus_frame_desc_entry entry;
 	int ret;
 
+	ret = cal_get_remote_frame_desc_entry(ctx->phy, ctx->stream, &entry);
+
+	if (ret == -ENOIOCTLCMD) {
+		ctx->vc = 0;
+		ctx->datatype = CAL_CSI2_CTX_DT_ANY;
+	} else if (!ret) {
+		ctx_dbg(2, ctx, "Framedesc: stream %u, len %u, vc %u, dt %#x\n",
+		       entry.stream,
+		       entry.length,
+		       entry.bus.csi2.vc,
+		       entry.bus.csi2.dt);
+
+		ctx->vc = entry.bus.csi2.vc;
+		ctx->datatype = entry.bus.csi2.dt;
+	} else {
+		ctx_err(ctx, "Failed to get remote frame desc: %d\n", ret);
+		return ret;
+	}
+
 	ctx->use_pix_proc = !ctx->fmtinfo->meta;
 
 	if (ctx->use_pix_proc) {
@@ -925,8 +971,7 @@ static struct cal_ctx *cal_ctx_create(struct cal_dev *cal, int inst)
 	ctx->dma_ctx = inst;
 	ctx->csi2_ctx = inst;
 	ctx->cport = inst;
-	ctx->vc = 0;
-	ctx->datatype = CAL_CSI2_CTX_DT_ANY;
+	ctx->stream = 0;
 
 	ret = cal_ctx_v4l2_init(ctx);
 	if (ret)
diff --git a/drivers/media/platform/ti-vpe/cal.h b/drivers/media/platform/ti-vpe/cal.h
index 29b865d1a238..3aea444f8bf8 100644
--- a/drivers/media/platform/ti-vpe/cal.h
+++ b/drivers/media/platform/ti-vpe/cal.h
@@ -245,6 +245,7 @@ struct cal_ctx {
 	u8			pix_proc;
 	u8			vc;
 	u8			datatype;
+	u32			stream;
 
 	bool			use_pix_proc;
 };
@@ -318,6 +319,8 @@ const struct cal_format_info *cal_format_by_code(u32 code);
 
 void cal_quickdump_regs(struct cal_dev *cal);
 
+int cal_camerarx_get_remote_frame_desc(struct cal_camerarx *phy,
+				       struct v4l2_mbus_frame_desc *fd);
 void cal_camerarx_disable(struct cal_camerarx *phy);
 void cal_camerarx_i913_errata(struct cal_camerarx *phy);
 struct cal_camerarx *cal_camerarx_create(struct cal_dev *cal,
-- 
2.25.1