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-rw-r--r--drivers/media/platform/s5p-jpeg/jpeg-core.c35
1 files changed, 35 insertions, 0 deletions
diff --git a/drivers/media/platform/s5p-jpeg/jpeg-core.c b/drivers/media/platform/s5p-jpeg/jpeg-core.c
index 9999c8f0111..6d90195f70d 100644
--- a/drivers/media/platform/s5p-jpeg/jpeg-core.c
+++ b/drivers/media/platform/s5p-jpeg/jpeg-core.c
@@ -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,
};