[PATCH v6 11/11] media: rkvdec: Fix enumerate frame sizes

[Jonas Karlman]

The VIDIOC_ENUM_FRAMESIZES ioctl should return all frame sizes (i. e.
width and height in pixels) that the device supports for the given pixel
format.

For coded format returning the frame size used to enforce HW alignment
requirements for CAPTURE buffers does not make fully sense.

Instead, signal applications what the maximum frame size that is
supported by the HW decoder using a frame size of continuous type.

Fixes: cd33c830448b ("media: rkvdec: Add the rkvdec driver")
Suggested-by: Alex Bee <knaerzche at gmail.com>
Signed-off-by: Jonas Karlman <jonas at kwiboo.se>
---
v6:
- New patch

With this change FFmpeg V4L2 Request API hwaccels can implement a strict
check if frame size is supported by the video device:
https://ffmpeg.org/pipermail/ffmpeg-devel/2024-August/332037.html
---
 drivers/staging/media/rkvdec/rkvdec.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/media/rkvdec/rkvdec.c b/drivers/staging/media/rkvdec/rkvdec.c
index c8c14f35ac44..9002eb3a59e5 100644
--- a/drivers/staging/media/rkvdec/rkvdec.c
+++ b/drivers/staging/media/rkvdec/rkvdec.c
@@ -334,8 +334,14 @@ static int rkvdec_enum_framesizes(struct file *file, void *priv,
 	if (!fmt)
 		return -EINVAL;
 
-	fsize->type = V4L2_FRMSIZE_TYPE_STEPWISE;
-	fsize->stepwise = fmt->frmsize;
+	fsize->type = V4L2_FRMSIZE_TYPE_CONTINUOUS;
+	fsize->stepwise.min_width = 1;
+	fsize->stepwise.max_width = fmt->frmsize.max_width;
+	fsize->stepwise.step_width = 1;
+	fsize->stepwise.min_height = 1;
+	fsize->stepwise.max_height = fmt->frmsize.max_height;
+	fsize->stepwise.step_height = 1;
+
 	return 0;
 }
 
-- 
2.46.0