mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-22 15:02:32 +00:00
4295485719
Boot tested on Raspberry Pi B+ (BCM2708) and Raspberry Pi 2 (BCM2709) Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
137 lines
5.0 KiB
Diff
137 lines
5.0 KiB
Diff
From e9ec6de11c358ff3bc389cfa0003544c60f859ef Mon Sep 17 00:00:00 2001
|
|
From: Hans Verkuil <hansverk@cisco.com>
|
|
Date: Thu, 23 Aug 2018 09:56:22 -0400
|
|
Subject: [PATCH 697/703] media: videodev2.h: add new capabilities for buffer
|
|
types
|
|
|
|
Upstream commit f35f5d72e70e6b91389eb98fcabf43b79f40587f
|
|
|
|
VIDIOC_REQBUFS and VIDIOC_CREATE_BUFFERS will return capabilities
|
|
telling userspace what the given buffer type is capable of.
|
|
|
|
Signed-off-by: Hans Verkuil <hansverk@cisco.com>
|
|
Reviewed-by: Tomasz Figa <tfiga@chromium.org>
|
|
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
|
|
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
|
|
---
|
|
.../media/uapi/v4l/vidioc-create-bufs.rst | 14 ++++++-
|
|
.../media/uapi/v4l/vidioc-reqbufs.rst | 42 ++++++++++++++++++-
|
|
include/uapi/linux/videodev2.h | 13 +++++-
|
|
3 files changed, 65 insertions(+), 4 deletions(-)
|
|
|
|
--- a/Documentation/media/uapi/v4l/vidioc-create-bufs.rst
|
|
+++ b/Documentation/media/uapi/v4l/vidioc-create-bufs.rst
|
|
@@ -102,7 +102,19 @@ than the number requested.
|
|
- ``format``
|
|
- Filled in by the application, preserved by the driver.
|
|
* - __u32
|
|
- - ``reserved``\ [8]
|
|
+ - ``capabilities``
|
|
+ - Set by the driver. If 0, then the driver doesn't support
|
|
+ capabilities. In that case all you know is that the driver is
|
|
+ guaranteed to support ``V4L2_MEMORY_MMAP`` and *might* support
|
|
+ other :c:type:`v4l2_memory` types. It will not support any others
|
|
+ capabilities. See :ref:`here <v4l2-buf-capabilities>` for a list of the
|
|
+ capabilities.
|
|
+
|
|
+ If you want to just query the capabilities without making any
|
|
+ other changes, then set ``count`` to 0, ``memory`` to
|
|
+ ``V4L2_MEMORY_MMAP`` and ``format.type`` to the buffer type.
|
|
+ * - __u32
|
|
+ - ``reserved``\ [7]
|
|
- A place holder for future extensions. Drivers and applications
|
|
must set the array to zero.
|
|
|
|
--- a/Documentation/media/uapi/v4l/vidioc-reqbufs.rst
|
|
+++ b/Documentation/media/uapi/v4l/vidioc-reqbufs.rst
|
|
@@ -88,10 +88,50 @@ any DMA in progress, an implicit
|
|
``V4L2_MEMORY_DMABUF`` or ``V4L2_MEMORY_USERPTR``. See
|
|
:c:type:`v4l2_memory`.
|
|
* - __u32
|
|
- - ``reserved``\ [2]
|
|
+ - ``capabilities``
|
|
+ - Set by the driver. If 0, then the driver doesn't support
|
|
+ capabilities. In that case all you know is that the driver is
|
|
+ guaranteed to support ``V4L2_MEMORY_MMAP`` and *might* support
|
|
+ other :c:type:`v4l2_memory` types. It will not support any others
|
|
+ capabilities.
|
|
+
|
|
+ If you want to query the capabilities with a minimum of side-effects,
|
|
+ then this can be called with ``count`` set to 0, ``memory`` set to
|
|
+ ``V4L2_MEMORY_MMAP`` and ``type`` set to the buffer type. This will
|
|
+ free any previously allocated buffers, so this is typically something
|
|
+ that will be done at the start of the application.
|
|
+ * - __u32
|
|
+ - ``reserved``\ [1]
|
|
- A place holder for future extensions. Drivers and applications
|
|
must set the array to zero.
|
|
|
|
+.. tabularcolumns:: |p{6.1cm}|p{2.2cm}|p{8.7cm}|
|
|
+
|
|
+.. _v4l2-buf-capabilities:
|
|
+.. _V4L2-BUF-CAP-SUPPORTS-MMAP:
|
|
+.. _V4L2-BUF-CAP-SUPPORTS-USERPTR:
|
|
+.. _V4L2-BUF-CAP-SUPPORTS-DMABUF:
|
|
+.. _V4L2-BUF-CAP-SUPPORTS-REQUESTS:
|
|
+
|
|
+.. cssclass:: longtable
|
|
+
|
|
+.. flat-table:: V4L2 Buffer Capabilities Flags
|
|
+ :header-rows: 0
|
|
+ :stub-columns: 0
|
|
+ :widths: 3 1 4
|
|
+
|
|
+ * - ``V4L2_BUF_CAP_SUPPORTS_MMAP``
|
|
+ - 0x00000001
|
|
+ - This buffer type supports the ``V4L2_MEMORY_MMAP`` streaming mode.
|
|
+ * - ``V4L2_BUF_CAP_SUPPORTS_USERPTR``
|
|
+ - 0x00000002
|
|
+ - This buffer type supports the ``V4L2_MEMORY_USERPTR`` streaming mode.
|
|
+ * - ``V4L2_BUF_CAP_SUPPORTS_DMABUF``
|
|
+ - 0x00000004
|
|
+ - This buffer type supports the ``V4L2_MEMORY_DMABUF`` streaming mode.
|
|
+ * - ``V4L2_BUF_CAP_SUPPORTS_REQUESTS``
|
|
+ - 0x00000008
|
|
+ - This buffer type supports :ref:`requests <media-request-api>`.
|
|
|
|
Return Value
|
|
============
|
|
--- a/include/uapi/linux/videodev2.h
|
|
+++ b/include/uapi/linux/videodev2.h
|
|
@@ -872,9 +872,16 @@ struct v4l2_requestbuffers {
|
|
__u32 count;
|
|
__u32 type; /* enum v4l2_buf_type */
|
|
__u32 memory; /* enum v4l2_memory */
|
|
- __u32 reserved[2];
|
|
+ __u32 capabilities;
|
|
+ __u32 reserved[1];
|
|
};
|
|
|
|
+/* 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)
|
|
+
|
|
/**
|
|
* struct v4l2_plane - plane info for multi-planar buffers
|
|
* @bytesused: number of bytes occupied by data in the plane (payload)
|
|
@@ -2318,6 +2325,7 @@ struct v4l2_dbg_chip_info {
|
|
* return: number of created buffers
|
|
* @memory: enum v4l2_memory; buffer memory type
|
|
* @format: frame format, for which buffers are requested
|
|
+ * @capabilities: capabilities of this buffer type.
|
|
* @reserved: future extensions
|
|
*/
|
|
struct v4l2_create_buffers {
|
|
@@ -2325,7 +2333,8 @@ struct v4l2_create_buffers {
|
|
__u32 count;
|
|
__u32 memory;
|
|
struct v4l2_format format;
|
|
- __u32 reserved[8];
|
|
+ __u32 capabilities;
|
|
+ __u32 reserved[7];
|
|
};
|
|
|
|
/*
|