media: amphion: adjust the encoder's value range of gop size

[ Upstream commit 996f4e8 ]

adjust the value range of gop size from [0, 65535] to [1, 8000].
when the gop size is set to a too large value,
it may affect the encoded picture quality.
so constrain it to a reasonable range.

Fixes: 0401e65 ("media: amphion: add v4l2 m2m vpu encoder stateful driver")
Signed-off-by: Ming Qian <ming.qian@nxp.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

drivers/media/platform/amphion/venc.c

@@ -644,7 +644,7 @@ static int venc_ctrl_init(struct vpu_inst *inst)
 			  BITRATE_DEFAULT_PEAK);
 
 	v4l2_ctrl_new_std(&inst->ctrl_handler, &venc_ctrl_ops,
-			  V4L2_CID_MPEG_VIDEO_GOP_SIZE, 0, (1 << 16) - 1, 1, 30);
+			  V4L2_CID_MPEG_VIDEO_GOP_SIZE, 1, 8000, 1, 30);
 
 	v4l2_ctrl_new_std(&inst->ctrl_handler, &venc_ctrl_ops,
 			  V4L2_CID_MPEG_VIDEO_B_FRAMES, 0, 4, 1, 0);