@@ -166,6 +166,11 @@ aborting or finishing any DMA in progress, an implicit
- Only valid for stateless decoders. If set, then userspace can set the
``V4L2_BUF_FLAG_M2M_HOLD_CAPTURE_BUF`` flag to hold off on returning the
capture buffer until the OUTPUT timestamp changes.
+ * - ``V4L2_BUF_CAP_SUPPORTS_CACHE_HINTS``
+ - 0x00000040
+ - This buffer supports :ref:`V4L2_BUF_FLAG_NO_CACHE_INVALIDATE` and
+ :ref:`V4L2_BUF_FLAG_NO_CACHE_CLEAN` user-space cache hints.
+
Return Value
============
@@ -684,6 +684,8 @@ static void fill_buf_caps(struct vb2_queue *q, u32 *caps)
*caps |= V4L2_BUF_CAP_SUPPORTS_DMABUF;
if (q->subsystem_flags & VB2_V4L2_FL_SUPPORTS_M2M_HOLD_CAPTURE_BUF)
*caps |= V4L2_BUF_CAP_SUPPORTS_M2M_HOLD_CAPTURE_BUF;
+ if (q->allow_cache_hints)
+ *caps |= V4L2_BUF_CAP_SUPPORTS_CACHE_HINTS;
#ifdef CONFIG_MEDIA_CONTROLLER_REQUEST_API
if (q->supports_requests)
*caps |= V4L2_BUF_CAP_SUPPORTS_REQUESTS;
@@ -932,6 +932,7 @@ struct v4l2_requestbuffers {
#define V4L2_BUF_CAP_SUPPORTS_REQUESTS (1 << 3)
#define V4L2_BUF_CAP_SUPPORTS_ORPHANED_BUFS (1 << 4)
#define V4L2_BUF_CAP_SUPPORTS_M2M_HOLD_CAPTURE_BUF (1 << 5)
+#define V4L2_BUF_CAP_SUPPORTS_CACHE_HINTS (1 << 6)
/**
* struct v4l2_plane - plane info for multi-planar buffers
Add V4L2_BUF_CAP_SUPPORTS_CACHE_HINTS to fill_buf_caps(), which is set when queue supports user-space cache management hints. Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org> --- Documentation/media/uapi/v4l/vidioc-reqbufs.rst | 5 +++++ drivers/media/common/videobuf2/videobuf2-v4l2.c | 2 ++ include/uapi/linux/videodev2.h | 1 + 3 files changed, 8 insertions(+)