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lib/vsprintf: Add support for printing V4L2 and DRM fourccs

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Add a printk modifier %p4cc (for pixel format) for printing V4L2 and DRM
pixel formats denoted by fourccs. The fourcc encoding is the same for both
so the same implementation can be used.

Suggested-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20210216155723.17109-2-sakari.ailus@linux.intel.com
This commit is contained in:
Sakari Ailus
2021-02-16 17:57:20 +02:00
committed by Thomas Zimmermann
parent 4d36cf0702
commit af612e43de
4 changed files with 79 additions and 2 deletions
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18
Documentation/core-api/printk-formats.rst
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@@ -567,6 +567,24 @@ For printing netdev_features_t.
Passed by reference.
V4L2 and DRM FourCC code (pixel format)
---------------------------------------
::
%p4cc
Print a FourCC code used by V4L2 or DRM, including format endianness and
its numerical value as hexadecimal.
Passed by reference.
Examples::
%p4cc BG12 little-endian (0x32314742)
%p4cc Y10 little-endian (0x20303159)
%p4cc NV12 big-endian (0xb231564e)
Thanks
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