Add a rkvdec_is_valid_fmt() helper that check if a fourcc is a supported
CAPTURE format, and a rkvdec_enum_decoded_fmt() helper that enumerates
valid formats.

This moves current code into helper functions in preparation for adding
CAPTURE format filtering and validation in next patch.

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Tested-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Tested-by: Christopher Obbard <chris.obbard@collabora.com>
---
v6:
- No change

v5:
- Update commit message
- Collect r-b and t-b tags

v4:
- Rename rkvdec_decoded_fmts() to rkvdec_enum_decoded_fmt()
- Rename rkvdec_valid_fmt() to rkvdec_is_valid_fmt()

v3:
- New patch
---
 drivers/staging/media/rkvdec/rkvdec.c | 49 +++++++++++++++++++--------
 1 file changed, 35 insertions(+), 14 deletions(-)

diff --git a/drivers/staging/media/rkvdec/rkvdec.c b/drivers/staging/media/rkvdec/rkvdec.c
index 7e59db3fc24d..efbf9aa578ae 100644
--- a/drivers/staging/media/rkvdec/rkvdec.c
+++ b/drivers/staging/media/rkvdec/rkvdec.c
@@ -27,6 +27,32 @@
 #include "rkvdec.h"
 #include "rkvdec-regs.h"
 
+static u32 rkvdec_enum_decoded_fmt(struct rkvdec_ctx *ctx, int index)
+{
+	const struct rkvdec_coded_fmt_desc *desc = ctx->coded_fmt_desc;
+
+	if (WARN_ON(!desc))
+		return 0;
+
+	if (index >= desc->num_decoded_fmts)
+		return 0;
+
+	return desc->decoded_fmts[index];
+}
+
+static bool rkvdec_is_valid_fmt(struct rkvdec_ctx *ctx, u32 fourcc)
+{
+	const struct rkvdec_coded_fmt_desc *desc = ctx->coded_fmt_desc;
+	unsigned int i;
+
+	for (i = 0; i < desc->num_decoded_fmts; i++) {
+		if (desc->decoded_fmts[i] == fourcc)
+			return true;
+	}
+
+	return false;
+}
+
 static void rkvdec_fill_decoded_pixfmt(struct rkvdec_ctx *ctx,
 				       struct v4l2_pix_format_mplane *pix_mp)
 {
@@ -52,8 +78,10 @@ static void rkvdec_reset_fmt(struct rkvdec_ctx *ctx, struct v4l2_format *f,
 static void rkvdec_reset_decoded_fmt(struct rkvdec_ctx *ctx)
 {
 	struct v4l2_format *f = &ctx->decoded_fmt;
+	u32 fourcc;
 
-	rkvdec_reset_fmt(ctx, f, ctx->coded_fmt_desc->decoded_fmts[0]);
+	fourcc = rkvdec_enum_decoded_fmt(ctx, 0);
+	rkvdec_reset_fmt(ctx, f, fourcc);
 	f->type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
 	f->fmt.pix_mp.width = ctx->coded_fmt.fmt.pix_mp.width;
 	f->fmt.pix_mp.height = ctx->coded_fmt.fmt.pix_mp.height;
@@ -244,7 +272,6 @@ static int rkvdec_try_capture_fmt(struct file *file, void *priv,
 	struct v4l2_pix_format_mplane *pix_mp = &f->fmt.pix_mp;
 	struct rkvdec_ctx *ctx = fh_to_rkvdec_ctx(priv);
 	const struct rkvdec_coded_fmt_desc *coded_desc;
-	unsigned int i;
 
 	/*
 	 * The codec context should point to a coded format desc, if the format
@@ -255,13 +282,8 @@ static int rkvdec_try_capture_fmt(struct file *file, void *priv,
 	if (WARN_ON(!coded_desc))
 		return -EINVAL;
 
-	for (i = 0; i < coded_desc->num_decoded_fmts; i++) {
-		if (coded_desc->decoded_fmts[i] == pix_mp->pixelformat)
-			break;
-	}
-
-	if (i == coded_desc->num_decoded_fmts)
-		pix_mp->pixelformat = coded_desc->decoded_fmts[0];
+	if (!rkvdec_is_valid_fmt(ctx, pix_mp->pixelformat))
+		pix_mp->pixelformat = rkvdec_enum_decoded_fmt(ctx, 0);
 
 	/* Always apply the frmsize constraint of the coded end. */
 	pix_mp->width = max(pix_mp->width, ctx->coded_fmt.fmt.pix_mp.width);
@@ -425,14 +447,13 @@ static int rkvdec_enum_capture_fmt(struct file *file, void *priv,
 				   struct v4l2_fmtdesc *f)
 {
 	struct rkvdec_ctx *ctx = fh_to_rkvdec_ctx(priv);
+	u32 fourcc;
 
-	if (WARN_ON(!ctx->coded_fmt_desc))
-		return -EINVAL;
-
-	if (f->index >= ctx->coded_fmt_desc->num_decoded_fmts)
+	fourcc = rkvdec_enum_decoded_fmt(ctx, f->index);
+	if (!fourcc)
 		return -EINVAL;
 
-	f->pixelformat = ctx->coded_fmt_desc->decoded_fmts[f->index];
+	f->pixelformat = fourcc;
 	return 0;
 }
 
-- 
2.46.0