linux-kernel - [PATCH v8 2/3] media: rkvdec: Add get_image

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Message-Id: <20250417-b4-rkvdec_h264_high10_and_422_support-v8-2-423fe0a2ee7e@collabora.com>
Date: Thu, 17 Apr 2025 13:14:24 -0400
From: Nicolas Dufresne <nicolas.dufresne@...labora.com>
To: Ezequiel Garcia <ezequiel@...guardiasur.com.ar>, 
 Mauro Carvalho Chehab <mchehab@...nel.org>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-media@...r.kernel.org, linux-rockchip@...ts.infradead.org, 
 linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org, 
 Nicolas Dufresne <nicolas.dufresne@...labora.com>, kernel@...labora.com, 
 Jonas Karlman <jonas@...boo.se>, 
 Christopher Obbard <christopher.obbard@...aro.org>
Subject: [PATCH v8 2/3] media: rkvdec: Add get_image_fmt ops

From: Jonas Karlman <jonas@...boo.se>

Add support for a get_image_fmt() ops that returns the required image
format.

The CAPTURE format is reset when the required image format changes and
the buffer queue is not busy.

Signed-off-by: Jonas Karlman <jonas@...boo.se>
Reviewed-by: Nicolas Dufresne <nicolas.dufresne@...labora.com>
Tested-by: Nicolas Dufresne <nicolas.dufresne@...labora.com>
Tested-by: Christopher Obbard <chris.obbard@...labora.com>
Co-developed-by: Nicolas Dufresne <nicolas.dufresne@...labora.com>
Signed-off-by: Nicolas Dufresne <nicolas.dufresne@...labora.com>
---
 drivers/staging/media/rkvdec/rkvdec.c | 44 +++++++++++++++++++++++++++++++++--
 drivers/staging/media/rkvdec/rkvdec.h |  2 ++
 2 files changed, 44 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/media/rkvdec/rkvdec.c b/drivers/staging/media/rkvdec/rkvdec.c
index 65c6f1d07a493e017ae941780b823d41314a49b8..db01cc64f1ba2dcd5914537db41e2f51f454b186 100644
--- a/drivers/staging/media/rkvdec/rkvdec.c
+++ b/drivers/staging/media/rkvdec/rkvdec.c
@@ -72,6 +72,15 @@ static bool rkvdec_is_valid_fmt(struct rkvdec_ctx *ctx, u32 fourcc,
 	return false;
 }
 
+static bool rkvdec_fmt_changed(struct rkvdec_ctx *ctx,
+			       enum rkvdec_image_fmt image_fmt)
+{
+	if (image_fmt == RKVDEC_IMG_FMT_ANY)
+		return false;
+
+	return ctx->image_fmt != image_fmt;
+}
+
 static void rkvdec_fill_decoded_pixfmt(struct rkvdec_ctx *ctx,
 				       struct v4l2_pix_format_mplane *pix_mp)
 {
@@ -111,15 +120,46 @@ static int rkvdec_try_ctrl(struct v4l2_ctrl *ctrl)
 {
 	struct rkvdec_ctx *ctx = container_of(ctrl->handler, struct rkvdec_ctx, ctrl_hdl);
 	const struct rkvdec_coded_fmt_desc *desc = ctx->coded_fmt_desc;
+	int ret;
+
+	if (desc->ops->try_ctrl) {
+		ret = desc->ops->try_ctrl(ctx, ctrl);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+static int rkvdec_s_ctrl(struct v4l2_ctrl *ctrl)
+{
+	struct rkvdec_ctx *ctx = container_of(ctrl->handler, struct rkvdec_ctx, ctrl_hdl);
+	const struct rkvdec_coded_fmt_desc *desc = ctx->coded_fmt_desc;
+	enum rkvdec_image_fmt image_fmt;
+	struct vb2_queue *vq;
 
-	if (desc->ops->try_ctrl)
-		return desc->ops->try_ctrl(ctx, ctrl);
+	/* Check if this change requires a capture format reset */
+	if (!desc->ops->get_image_fmt)
+		return 0;
+
+	image_fmt = desc->ops->get_image_fmt(ctx, ctrl);
+	if (rkvdec_fmt_changed(ctx, image_fmt)) {
+		/* Format changes are not allowed when capture queue is busy */
+		vq = v4l2_m2m_get_vq(ctx->fh.m2m_ctx,
+				     V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE);
+		if (vb2_is_busy(vq))
+			return -EINVAL;
+
+		ctx->image_fmt = image_fmt;
+		rkvdec_reset_decoded_fmt(ctx);
+	}
 
 	return 0;
 }
 
 static const struct v4l2_ctrl_ops rkvdec_ctrl_ops = {
 	.try_ctrl = rkvdec_try_ctrl,
+	.s_ctrl = rkvdec_s_ctrl,
 };
 
 static const struct rkvdec_ctrl_desc rkvdec_h264_ctrl_descs[] = {
diff --git a/drivers/staging/media/rkvdec/rkvdec.h b/drivers/staging/media/rkvdec/rkvdec.h
index 6f8cf50c5d99aad2f52e321f54f3ca17166ddf98..e466a2753ccfc13738e0a672bc578e521af2c3f2 100644
--- a/drivers/staging/media/rkvdec/rkvdec.h
+++ b/drivers/staging/media/rkvdec/rkvdec.h
@@ -73,6 +73,8 @@ struct rkvdec_coded_fmt_ops {
 		     struct vb2_v4l2_buffer *dst_buf,
 		     enum vb2_buffer_state result);
 	int (*try_ctrl)(struct rkvdec_ctx *ctx, struct v4l2_ctrl *ctrl);
+	enum rkvdec_image_fmt (*get_image_fmt)(struct rkvdec_ctx *ctx,
+					       struct v4l2_ctrl *ctrl);
 };
 
 enum rkvdec_image_fmt {

-- 
2.49.0