On 11/19/2013 03:27 PM, Jacek Anaszewski wrote:
> 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 adds mechanism that prevents setting invalid value
> of the V4L2_CID_JPEG_CHROMA_SUBSAMPLING control.
>
> Signed-off-by: Jacek Anaszewski <j.anaszew...@samsung.com>
> Signed-off-by: Kyungmin Park <kyungmin.p...@samsung.com>
> ---
> drivers/media/platform/s5p-jpeg/jpeg-core.c | 27
> +++++++++++++++++++++++++--
> 1 file changed, 25 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/media/platform/s5p-jpeg/jpeg-core.c
> b/drivers/media/platform/s5p-jpeg/jpeg-core.c
> index d4db612..3605470 100644
> --- a/drivers/media/platform/s5p-jpeg/jpeg-core.c
> +++ b/drivers/media/platform/s5p-jpeg/jpeg-core.c
> @@ -1176,6 +1176,7 @@ static int s5p_jpeg_s_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);
>
> @@ -1187,12 +1188,34 @@ static int s5p_jpeg_s_ctrl(struct v4l2_ctrl *ctrl)
> ctx->restart_interval = ctrl->val;
> break;
> case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
> - ctx->subsampling = ctrl->val;
> + if (ctx->jpeg->variant->version == SJPEG_S5P) {
> + ctx->subsampling = ctrl->val;
> + break;
> + }
> + /*
> + * 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)
> + ctx->subsampling = ctx->out_q.fmt->subsampling;
> + else
> + ctx->subsampling = ctrl->val;
I would do this in a try_ctrl op instead: that way VIDIOC_TRY_EXT_CTRLS will
also be able to understand these restrictions.
Before the s_ctrl op is called the control framework will always call the
try_ctrl op as well if it is present.
Regards,
Hans
> break;
> }
>
> +error_free:
> spin_unlock_irqrestore(&ctx->jpeg->slock, flags);
> - return 0;
> + return ret;
> }
>
> static const struct v4l2_ctrl_ops s5p_jpeg_ctrl_ops = {
>
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