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[media] s5p-jpeg: Ensure setting correct value of the chroma subsampling control

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Exynos4x12 has limitations regarding setting chroma subsampling
of an output JPEG image. It cannot be lower than the subsampling
of the raw source image. Also in case of V4L2_JPEG_CHROMA_SUBSAMPLING_GRAY
option the source image fourcc has to be V4L2_PIX_FMT_GREY.
This patch implements try_ctrl callback containing mechanism that
prevents setting invalid value of the V4L2_CID_JPEG_CHROMA_SUBSAMPLING
control.

Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
This commit is contained in:
Jacek Anaszewski 2013-11-21 13:34:01 -03:00 committed by Mauro Carvalho Chehab
parent 4a30d30b87
commit 11fbea3ef3
1 changed files with 35 additions and 0 deletions
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35
drivers/media/platform/s5p-jpeg/jpeg-core.c
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@ -1213,6 +1213,40 @@ static int s5p_jpeg_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
return 0;
}
static int s5p_jpeg_try_ctrl(struct v4l2_ctrl *ctrl)
{
struct s5p_jpeg_ctx *ctx = ctrl_to_ctx(ctrl);
unsigned long flags;
int ret = 0;
spin_lock_irqsave(&ctx->jpeg->slock, flags);
if (ctrl->id == V4L2_CID_JPEG_CHROMA_SUBSAMPLING) {
if (ctx->jpeg->variant->version == SJPEG_S5P)
goto error_free;
/*
* The exynos4x12 device requires input raw image fourcc
* to be V4L2_PIX_FMT_GREY if gray jpeg format
* is to be set.
*/
if (ctx->out_q.fmt->fourcc != V4L2_PIX_FMT_GREY &&
ctrl->val == V4L2_JPEG_CHROMA_SUBSAMPLING_GRAY) {
ret = -EINVAL;
goto error_free;
}
/*
* The exynos4x12 device requires resulting jpeg subsampling
* not to be lower than the input raw image subsampling.
*/
if (ctx->out_q.fmt->subsampling > ctrl->val)
ctrl->val = ctx->out_q.fmt->subsampling;
}
error_free:
spin_unlock_irqrestore(&ctx->jpeg->slock, flags);
return ret;
}
static int s5p_jpeg_s_ctrl(struct v4l2_ctrl *ctrl)
{
struct s5p_jpeg_ctx *ctx = ctrl_to_ctx(ctrl);
@ -1238,6 +1272,7 @@ static int s5p_jpeg_s_ctrl(struct v4l2_ctrl *ctrl)
static const struct v4l2_ctrl_ops s5p_jpeg_ctrl_ops = {
.g_volatile_ctrl = s5p_jpeg_g_volatile_ctrl,
.try_ctrl = s5p_jpeg_try_ctrl,
.s_ctrl = s5p_jpeg_s_ctrl,
};