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authorJavier Martinez Canillas <javier@osg.samsung.com>2016-05-31 13:56:08 -0300
committerMauro Carvalho Chehab <mchehab@s-opensource.com>2016-07-08 16:16:55 -0300
commitbcdb9040df9e1e2a16252791c43f9c40c2927dd3 (patch)
tree4342054e6a824513127bffc9847776af1724f271 /Documentation/DocBook
parente1f1cb8598a922d1754eb37adfad92f01b863e3e (diff)
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[media] DocBook: mention the memory type to be set for all streaming I/O
The DMA buffer importing streaming I/O section mentions the memory type value that has to be set when calling the VIDIOC_REQBUFS ioctl but this isn't mentioned in neither the Memory Mapping nor User Pointer sections. A user can know the values by looking at the examples but it's better to explicitly mention in the documentation, and also makes all sections about streaming I/O methods more consistent. Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com> Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Diffstat (limited to 'Documentation/DocBook')
-rw-r--r--Documentation/DocBook/media/v4l/io.xml4
1 files changed, 2 insertions, 2 deletions
diff --git a/Documentation/DocBook/media/v4l/io.xml b/Documentation/DocBook/media/v4l/io.xml
index e09025db92bd..21a3dde8f95d 100644
--- a/Documentation/DocBook/media/v4l/io.xml
+++ b/Documentation/DocBook/media/v4l/io.xml
@@ -88,7 +88,7 @@ function.<footnote>
<structfield>capabilities</structfield> field of &v4l2-capability;
returned by the &VIDIOC-QUERYCAP; ioctl is set. There are two
streaming methods, to determine if the memory mapping flavor is
-supported applications must call the &VIDIOC-REQBUFS; ioctl.</para>
+supported applications must call the &VIDIOC-REQBUFS; ioctl with the memory type set to <constant>V4L2_MEMORY_MMAP</constant>.</para>
<para>Streaming is an I/O method where only pointers to buffers
are exchanged between application and driver, the data itself is not
@@ -369,7 +369,7 @@ rest should be evident.</para>
<structfield>capabilities</structfield> field of &v4l2-capability;
returned by the &VIDIOC-QUERYCAP; ioctl is set. If the particular user
pointer method (not only memory mapping) is supported must be
-determined by calling the &VIDIOC-REQBUFS; ioctl.</para>
+determined by calling the &VIDIOC-REQBUFS; ioctl with the memory type set to <constant>V4L2_MEMORY_USERPTR</constant>.</para>
<para>This I/O method combines advantages of the read/write and
memory mapping methods. Buffers (planes) are allocated by the application