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| author | Sakari Ailus <sakari.ailus@linux.intel.com> | 2021-02-16 16:57:20 +0100 |
|---|---|---|
| committer | Thomas Zimmermann <tzimmermann@suse.de> | 2021-02-17 12:52:20 +0100 |
| commit | af612e43de6d27df51a7636229be7d33fe3ab7b5 (patch) | |
| tree | a84a7181fd4374fbe5071b9c41dde8afc26c91e1 /Documentation/core-api/printk-formats.rst | |
| parent | drm/ast: Move all of the cursor-update functionality to atomic_update (diff) | |
| download | linux-af612e43de6d27df51a7636229be7d33fe3ab7b5.tar.xz linux-af612e43de6d27df51a7636229be7d33fe3ab7b5.zip | |
lib/vsprintf: Add support for printing V4L2 and DRM fourccs
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
Diffstat (limited to 'Documentation/core-api/printk-formats.rst')
| -rw-r--r-- | Documentation/core-api/printk-formats.rst | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/Documentation/core-api/printk-formats.rst b/Documentation/core-api/printk-formats.rst index 160e710d992f..8267675ea95c 100644 --- a/Documentation/core-api/printk-formats.rst +++ b/Documentation/core-api/printk-formats.rst @@ -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 ====== |