[PATCH] media: v4l2: Initialize mpeg slice controls

[Boris Brezillon]

Make sure the default value at least passes the std_validate() tests.

Signed-off-by: Boris Brezillon <boris.brezil...@collabora.com>
---
 drivers/media/v4l2-core/v4l2-ctrls.c | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c 
b/drivers/media/v4l2-core/v4l2-ctrls.c
index b1ae2e555c68..19d40cc6e565 100644
--- a/drivers/media/v4l2-core/v4l2-ctrls.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls.c
@@ -1461,7 +1461,14 @@ static bool std_equal(const struct v4l2_ctrl *ctrl, u32 
idx,
 static void std_init(const struct v4l2_ctrl *ctrl, u32 idx,
                     union v4l2_ctrl_ptr ptr)
 {
-       switch (ctrl->type) {
+       struct v4l2_ctrl_mpeg2_slice_params *p_mpeg2_slice_params;
+
+       /*
+        * The cast is needed to get rid of a gcc warning complaining that
+        * V4L2_CTRL_TYPE_MPEG2_SLICE_PARAMS is not part of the
+        * v4l2_ctrl_type enum.
+        */
+       switch ((u32)ctrl->type) {
        case V4L2_CTRL_TYPE_STRING:
                idx *= ctrl->elem_size;
                memset(ptr.p_char + idx, ' ', ctrl->minimum);
@@ -1486,6 +1493,17 @@ static void std_init(const struct v4l2_ctrl *ctrl, u32 
idx,
        case V4L2_CTRL_TYPE_U32:
                ptr.p_u32[idx] = ctrl->default_value;
                break;
+       case V4L2_CTRL_TYPE_MPEG2_SLICE_PARAMS:
+               p_mpeg2_slice_params = ptr.p;
+               /* 4:2:0 */
+               p_mpeg2_slice_params->sequence.chroma_format = 1;
+               /* 8 bits */
+               p_mpeg2_slice_params->picture.intra_dc_precision = 0;
+               /* interlaced top field */
+               p_mpeg2_slice_params->picture.picture_structure = 1;
+               p_mpeg2_slice_params->picture.picture_coding_type =
+                                       V4L2_MPEG2_PICTURE_CODING_TYPE_I;
+               break;
        default:
                idx *= ctrl->elem_size;
                memset(ptr.p + idx, 0, ctrl->elem_size);
-- 
2.20.1