media: v4l: Add 32-bit packed YUV formats

The formats added in this patch include:
 V4L2_PIX_FMT_AYUV32
 V4L2_PIX_FMT_XYUV32
 V4L2_PIX_FMT_VUYA32
 V4L2_PIX_FMT_VUYX32

These formats enable the trasmission of alpha channel data to other
drivers and userspace applications in addition to YUV data. For
example, buffers generated by drivers in one of these formats
can be used by the Weston compositor to display as a texture or
flipped directly onto the overlay planes with the help of a DRM
driver.

Signed-off-by: Vivek Kasireddy <vivek.kasireddy@intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

1 files changed, 169 insertions, 1 deletions

diff --git a/Documentation/media/uapi/v4l/pixfmt-packed-yuv.rst b/Documentation/media/uapi/v4l/pixfmt-packed-yuv.rst
index f53e8f57a003..7fcee1c11ac4 100644
--- a/Documentation/media/uapi/v4l/pixfmt-packed-yuv.rst
+++ b/Documentation/media/uapi/v4l/pixfmt-packed-yuv.rst
@@ -190,6 +190,170 @@ component of each pixel in one 16 or 32 bit word.
       - Cr\ :sub:`2`
       - Cr\ :sub:`1`
       - Cr\ :sub:`0`
+      -
+    * .. _V4L2-PIX-FMT-AYUV32:
+
+      - ``V4L2_PIX_FMT_AYUV32``
+      - 'AYUV'
+
+      - a\ :sub:`7`
+      - a\ :sub:`6`
+      - a\ :sub:`5`
+      - a\ :sub:`4`
+      - a\ :sub:`3`
+      - a\ :sub:`2`
+      - a\ :sub:`1`
+      - a\ :sub:`0`
+
+      - Y'\ :sub:`7`
+      - Y'\ :sub:`6`
+      - Y'\ :sub:`5`
+      - Y'\ :sub:`4`
+      - Y'\ :sub:`3`
+      - Y'\ :sub:`2`
+      - Y'\ :sub:`1`
+      - Y'\ :sub:`0`
+
+      - Cb\ :sub:`7`
+      - Cb\ :sub:`6`
+      - Cb\ :sub:`5`
+      - Cb\ :sub:`4`
+      - Cb\ :sub:`3`
+      - Cb\ :sub:`2`
+      - Cb\ :sub:`1`
+      - Cb\ :sub:`0`
+
+      - Cr\ :sub:`7`
+      - Cr\ :sub:`6`
+      - Cr\ :sub:`5`
+      - Cr\ :sub:`4`
+      - Cr\ :sub:`3`
+      - Cr\ :sub:`2`
+      - Cr\ :sub:`1`
+      - Cr\ :sub:`0`
+      -
+    * .. _V4L2-PIX-FMT-XYUV32:
+
+      - ``V4L2_PIX_FMT_XYUV32``
+      - 'XYUV'
+
+      -
+      -
+      -
+      -
+      -
+      -
+      -
+      -
+
+      - Y'\ :sub:`7`
+      - Y'\ :sub:`6`
+      - Y'\ :sub:`5`
+      - Y'\ :sub:`4`
+      - Y'\ :sub:`3`
+      - Y'\ :sub:`2`
+      - Y'\ :sub:`1`
+      - Y'\ :sub:`0`
+
+      - Cb\ :sub:`7`
+      - Cb\ :sub:`6`
+      - Cb\ :sub:`5`
+      - Cb\ :sub:`4`
+      - Cb\ :sub:`3`
+      - Cb\ :sub:`2`
+      - Cb\ :sub:`1`
+      - Cb\ :sub:`0`
+
+      - Cr\ :sub:`7`
+      - Cr\ :sub:`6`
+      - Cr\ :sub:`5`
+      - Cr\ :sub:`4`
+      - Cr\ :sub:`3`
+      - Cr\ :sub:`2`
+      - Cr\ :sub:`1`
+      - Cr\ :sub:`0`
+      -
+    * .. _V4L2-PIX-FMT-VUYA32:
+
+      - ``V4L2_PIX_FMT_VUYA32``
+      - 'VUYA'
+
+      - Cr\ :sub:`7`
+      - Cr\ :sub:`6`
+      - Cr\ :sub:`5`
+      - Cr\ :sub:`4`
+      - Cr\ :sub:`3`
+      - Cr\ :sub:`2`
+      - Cr\ :sub:`1`
+      - Cr\ :sub:`0`
+
+      - Cb\ :sub:`7`
+      - Cb\ :sub:`6`
+      - Cb\ :sub:`5`
+      - Cb\ :sub:`4`
+      - Cb\ :sub:`3`
+      - Cb\ :sub:`2`
+      - Cb\ :sub:`1`
+      - Cb\ :sub:`0`
+
+      - Y'\ :sub:`7`
+      - Y'\ :sub:`6`
+      - Y'\ :sub:`5`
+      - Y'\ :sub:`4`
+      - Y'\ :sub:`3`
+      - Y'\ :sub:`2`
+      - Y'\ :sub:`1`
+      - Y'\ :sub:`0`
+
+      - a\ :sub:`7`
+      - a\ :sub:`6`
+      - a\ :sub:`5`
+      - a\ :sub:`4`
+      - a\ :sub:`3`
+      - a\ :sub:`2`
+      - a\ :sub:`1`
+      - a\ :sub:`0`
+      -
+    * .. _V4L2-PIX-FMT-VUYX32:
+
+      - ``V4L2_PIX_FMT_VUYX32``
+      - 'VUYX'
+
+      - Cr\ :sub:`7`
+      - Cr\ :sub:`6`
+      - Cr\ :sub:`5`
+      - Cr\ :sub:`4`
+      - Cr\ :sub:`3`
+      - Cr\ :sub:`2`
+      - Cr\ :sub:`1`
+      - Cr\ :sub:`0`
+
+      - Cb\ :sub:`7`
+      - Cb\ :sub:`6`
+      - Cb\ :sub:`5`
+      - Cb\ :sub:`4`
+      - Cb\ :sub:`3`
+      - Cb\ :sub:`2`
+      - Cb\ :sub:`1`
+      - Cb\ :sub:`0`
+
+      - Y'\ :sub:`7`
+      - Y'\ :sub:`6`
+      - Y'\ :sub:`5`
+      - Y'\ :sub:`4`
+      - Y'\ :sub:`3`
+      - Y'\ :sub:`2`
+      - Y'\ :sub:`1`
+      - Y'\ :sub:`0`
+
+      -
+      -
+      -
+      -
+      -
+      -
+      -
+      -
 
 .. raw:: latex
 
@@ -202,4 +366,8 @@ component of each pixel in one 16 or 32 bit word.
     #) The value of a = alpha bits is undefined when reading from the driver,
        ignored when writing to the driver, except when alpha blending has
        been negotiated for a :ref:`Video Overlay <overlay>` or
-       :ref:`Video Output Overlay <osd>`.
+       :ref:`Video Output Overlay <osd>` for the formats Y444, YUV555 and
+       YUV4. However, for formats AYUV32 and VUYA32, the alpha component is
+       expected to contain a meaningful value that can be used by drivers
+       and applications. And, the formats XYUV32 and VUYX32 contain undefined
+       alpha values that must be ignored by all applications and drivers.