Merge branch 'next' of git://git.infradead.org/users/vkoul/slave-dma

[pandora-kernel.git] / Documentation / DocBook / media / v4l / io.xml

diff --git a/Documentation/DocBook/media/v4l/io.xml b/Documentation/DocBook/media/v4l/io.xml
index c57d1ec..3f47df1 100644 (file)
--- a/Documentation/DocBook/media/v4l/io.xml
+++ b/Documentation/DocBook/media/v4l/io.xml
@@ -927,6 +927,33 @@ ioctl is called.</entry>
 Applications set or clear this flag before calling the
 <constant>VIDIOC_QBUF</constant> ioctl.</entry>
          </row>
+         <row>
+           <entry><constant>V4L2_BUF_FLAG_PREPARED</constant></entry>
+           <entry>0x0400</entry>
+           <entry>The buffer has been prepared for I/O and can be queued by the
+application. Drivers set or clear this flag when the
+<link linkend="vidioc-querybuf">VIDIOC_QUERYBUF</link>, <link
+         linkend="vidioc-qbuf">VIDIOC_PREPARE_BUF</link>, <link
+         linkend="vidioc-qbuf">VIDIOC_QBUF</link> or <link
+         linkend="vidioc-qbuf">VIDIOC_DQBUF</link> ioctl is called.</entry>
+         </row>
+         <row>
+           <entry><constant>V4L2_BUF_FLAG_NO_CACHE_INVALIDATE</constant></entry>
+           <entry>0x0400</entry>
+           <entry>Caches do not have to be invalidated for this buffer.
+Typically applications shall use this flag if the data captured in the buffer
+is not going to be touched by the CPU, instead the buffer will, probably, be
+passed on to a DMA-capable hardware unit for further processing or output.
+</entry>
+         </row>
+         <row>
+           <entry><constant>V4L2_BUF_FLAG_NO_CACHE_CLEAN</constant></entry>
+           <entry>0x0800</entry>
+           <entry>Caches do not have to be cleaned for this buffer.
+Typically 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.</entry>
+         </row>
        </tbody>
       </tgroup>
     </table>