linux-kernel - [PATCH 6.0 491/862] media: amphion: adjust the encoders value range of gop size

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Date:   Wed, 19 Oct 2022 10:29:38 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Ming Qian <ming.qian@....com>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 6.0 491/862] media: amphion: adjust the encoders value range of gop size

From: Ming Qian <ming.qian@....com>

[ Upstream commit 996f4e89fabe44ab9ac0aabb0697aeecbe717eca ]

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: 0401e659c1f92 ("media: amphion: add v4l2 m2m vpu encoder stateful driver")
Signed-off-by: Ming Qian <ming.qian@....com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@...all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/media/platform/amphion/venc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/platform/amphion/venc.c b/drivers/media/platform/amphion/venc.c
index 461524dd1e44..37212f087fdd 100644
--- a/drivers/media/platform/amphion/venc.c
+++ b/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);
-- 
2.35.1