--- /dev/null
+From dfcdc4ed9a514cd5d77dd18c6527f257f8aaf378 Mon Sep 17 00:00:00 2001
+From: Hans Verkuil <hverkuil-cisco@xs4all.nl>
+Date: Fri, 11 Oct 2019 06:32:40 -0300
+Subject: [PATCH] media: vb2: add V4L2_BUF_FLAG_M2M_HOLD_CAPTURE_BUF
+
+This patch adds support for the V4L2_BUF_FLAG_M2M_HOLD_CAPTURE_BUF
+flag.
+
+It also adds a new V4L2_BUF_CAP_SUPPORTS_M2M_HOLD_CAPTURE_BUF
+capability.
+
+Drivers should set vb2_queue->subsystem_flags to
+VB2_V4L2_FL_SUPPORTS_M2M_HOLD_CAPTURE_BUF to indicate support
+for this flag.
+
+Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
+Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
+---
+ Documentation/media/uapi/v4l/buffer.rst | 13 +++++++++++++
+ Documentation/media/uapi/v4l/vidioc-reqbufs.rst | 6 ++++++
+ drivers/media/common/videobuf2/videobuf2-v4l2.c | 12 ++++++++++--
+ include/media/videobuf2-core.h | 3 +++
+ include/media/videobuf2-v4l2.h | 5 +++++
+ include/uapi/linux/videodev2.h | 13 ++++++++-----
+ 6 files changed, 45 insertions(+), 7 deletions(-)
+
+--- a/Documentation/media/uapi/v4l/buffer.rst
++++ b/Documentation/media/uapi/v4l/buffer.rst
+@@ -607,6 +607,19 @@ Buffer Flags
+ applications shall use this flag for output buffers if the data in
+ this buffer has not been created by the CPU but by some
+ DMA-capable unit, in which case caches have not been used.
++ * .. _`V4L2-BUF-FLAG-M2M-HOLD-CAPTURE-BUF`:
++
++ - ``V4L2_BUF_FLAG_M2M_HOLD_CAPTURE_BUF``
++ - 0x00000200
++ - Only valid if ``V4L2_BUF_CAP_SUPPORTS_M2M_HOLD_CAPTURE_BUF`` is
++ set. It is typically used with stateless decoders where multiple
++ output buffers each decode to a slice of the decoded frame.
++ Applications can set this flag when queueing the output buffer
++ to prevent the driver from dequeueing the capture buffer after
++ the output buffer has been decoded (i.e. the capture buffer is
++ 'held'). If the timestamp of this output buffer differs from that
++ of the previous output buffer, then that indicates the start of a
++ new frame and the previously held capture buffer is dequeued.
+ * .. _`V4L2-BUF-FLAG-LAST`:
+
+ - ``V4L2_BUF_FLAG_LAST``
+--- a/Documentation/media/uapi/v4l/vidioc-reqbufs.rst
++++ b/Documentation/media/uapi/v4l/vidioc-reqbufs.rst
+@@ -125,6 +125,7 @@ aborting or finishing any DMA in progres
+ .. _V4L2-BUF-CAP-SUPPORTS-DMABUF:
+ .. _V4L2-BUF-CAP-SUPPORTS-REQUESTS:
+ .. _V4L2-BUF-CAP-SUPPORTS-ORPHANED-BUFS:
++.. _V4L2-BUF-CAP-SUPPORTS-M2M-HOLD-CAPTURE-BUF:
+
+ .. cssclass:: longtable
+
+@@ -150,6 +151,11 @@ aborting or finishing any DMA in progres
+ - The kernel allows calling :ref:`VIDIOC_REQBUFS` while buffers are still
+ mapped or exported via DMABUF. These orphaned buffers will be freed
+ when they are unmapped or when the exported DMABUF fds are closed.
++ * - ``V4L2_BUF_CAP_SUPPORTS_M2M_HOLD_CAPTURE_BUF``
++ - 0x00000020
++ - 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.
+
+ Return Value
+ ============
+--- a/drivers/media/common/videobuf2/videobuf2-v4l2.c
++++ b/drivers/media/common/videobuf2/videobuf2-v4l2.c
+@@ -49,8 +49,11 @@ module_param(debug, int, 0644);
+ V4L2_BUF_FLAG_REQUEST_FD | \
+ V4L2_BUF_FLAG_TIMESTAMP_MASK)
+ /* Output buffer flags that should be passed on to the driver */
+-#define V4L2_BUFFER_OUT_FLAGS (V4L2_BUF_FLAG_PFRAME | V4L2_BUF_FLAG_BFRAME | \
+- V4L2_BUF_FLAG_KEYFRAME | V4L2_BUF_FLAG_TIMECODE)
++#define V4L2_BUFFER_OUT_FLAGS (V4L2_BUF_FLAG_PFRAME | \
++ V4L2_BUF_FLAG_BFRAME | \
++ V4L2_BUF_FLAG_KEYFRAME | \
++ V4L2_BUF_FLAG_TIMECODE | \
++ V4L2_BUF_FLAG_M2M_HOLD_CAPTURE_BUF)
+
+ /*
+ * __verify_planes_array() - verify that the planes array passed in struct
+@@ -194,6 +197,7 @@ static int vb2_fill_vb2_v4l2_buffer(stru
+ }
+ vbuf->sequence = 0;
+ vbuf->request_fd = -1;
++ vbuf->is_held = false;
+
+ if (V4L2_TYPE_IS_MULTIPLANAR(b->type)) {
+ switch (b->memory) {
+@@ -321,6 +325,8 @@ static int vb2_fill_vb2_v4l2_buffer(stru
+ */
+ vbuf->flags &= ~V4L2_BUF_FLAG_TIMECODE;
+ vbuf->field = b->field;
++ if (!(q->subsystem_flags & VB2_V4L2_FL_SUPPORTS_M2M_HOLD_CAPTURE_BUF))
++ vbuf->flags &= ~V4L2_BUF_FLAG_M2M_HOLD_CAPTURE_BUF;
+ } else {
+ /* Zero any output buffer flags as this is a capture buffer */
+ vbuf->flags &= ~V4L2_BUFFER_OUT_FLAGS;
+@@ -654,6 +660,8 @@ static void fill_buf_caps(struct vb2_que
+ *caps |= V4L2_BUF_CAP_SUPPORTS_USERPTR;
+ if (q->io_modes & VB2_DMABUF)
+ *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;
+ #ifdef CONFIG_MEDIA_CONTROLLER_REQUEST_API
+ if (q->supports_requests)
+ *caps |= V4L2_BUF_CAP_SUPPORTS_REQUESTS;
+--- a/include/media/videobuf2-core.h
++++ b/include/media/videobuf2-core.h
+@@ -505,6 +505,8 @@ struct vb2_buf_ops {
+ * @buf_ops: callbacks to deliver buffer information.
+ * between user-space and kernel-space.
+ * @drv_priv: driver private data.
++ * @subsystem_flags: Flags specific to the subsystem (V4L2/DVB/etc.). Not used
++ * by the vb2 core.
+ * @buf_struct_size: size of the driver-specific buffer structure;
+ * "0" indicates the driver doesn't want to use a custom buffer
+ * structure type. for example, ``sizeof(struct vb2_v4l2_buffer)``
+@@ -571,6 +573,7 @@ struct vb2_queue {
+ const struct vb2_buf_ops *buf_ops;
+
+ void *drv_priv;
++ u32 subsystem_flags;
+ unsigned int buf_struct_size;
+ u32 timestamp_flags;
+ gfp_t gfp_flags;
+--- a/include/media/videobuf2-v4l2.h
++++ b/include/media/videobuf2-v4l2.h
+@@ -33,6 +33,7 @@
+ * @timecode: frame timecode.
+ * @sequence: sequence count of this frame.
+ * @request_fd: the request_fd associated with this buffer
++ * @is_held: if true, then this capture buffer was held
+ * @planes: plane information (userptr/fd, length, bytesused, data_offset).
+ *
+ * Should contain enough information to be able to cover all the fields
+@@ -46,9 +47,13 @@ struct vb2_v4l2_buffer {
+ struct v4l2_timecode timecode;
+ __u32 sequence;
+ __s32 request_fd;
++ bool is_held;
+ struct vb2_plane planes[VB2_MAX_PLANES];
+ };
+
++/* VB2 V4L2 flags as set in vb2_queue.subsystem_flags */
++#define VB2_V4L2_FL_SUPPORTS_M2M_HOLD_CAPTURE_BUF (1 << 0)
++
+ /*
+ * to_vb2_v4l2_buffer() - cast struct vb2_buffer * to struct vb2_v4l2_buffer *
+ */
+--- a/include/uapi/linux/videodev2.h
++++ b/include/uapi/linux/videodev2.h
+@@ -925,11 +925,12 @@ struct v4l2_requestbuffers {
+ };
+
+ /* capabilities for struct v4l2_requestbuffers and v4l2_create_buffers */
+-#define V4L2_BUF_CAP_SUPPORTS_MMAP (1 << 0)
+-#define V4L2_BUF_CAP_SUPPORTS_USERPTR (1 << 1)
+-#define V4L2_BUF_CAP_SUPPORTS_DMABUF (1 << 2)
+-#define V4L2_BUF_CAP_SUPPORTS_REQUESTS (1 << 3)
+-#define V4L2_BUF_CAP_SUPPORTS_ORPHANED_BUFS (1 << 4)
++#define V4L2_BUF_CAP_SUPPORTS_MMAP (1 << 0)
++#define V4L2_BUF_CAP_SUPPORTS_USERPTR (1 << 1)
++#define V4L2_BUF_CAP_SUPPORTS_DMABUF (1 << 2)
++#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)
+
+ /**
+ * struct v4l2_plane - plane info for multi-planar buffers
+@@ -1051,6 +1052,8 @@ static inline __u64 v4l2_timeval_to_ns(c
+ #define V4L2_BUF_FLAG_IN_REQUEST 0x00000080
+ /* timecode field is valid */
+ #define V4L2_BUF_FLAG_TIMECODE 0x00000100
++/* Don't return the capture buffer until OUTPUT timestamp changes */
++#define V4L2_BUF_FLAG_M2M_HOLD_CAPTURE_BUF 0x00000200
+ /* Buffer is prepared for queuing */
+ #define V4L2_BUF_FLAG_PREPARED 0x00000400
+ /* Cache handling flags */
projects / openwrt / staging / luka.git / blobdiff