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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
lib/test_printf.c
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@@ -649,6 +649,23 @@ static void __init fwnode_pointer(void)
software_node_unregister(&softnodes[0]);
}
static void __init fourcc_pointer(void)
{
struct {
u32 code;
char *str;
} const try[] = {
{ 0x3231564e, "NV12 little-endian (0x3231564e)", },
{ 0xb231564e, "NV12 big-endian (0xb231564e)", },
{ 0x10111213, ".... little-endian (0x10111213)", },
{ 0x20303159, "Y10 little-endian (0x20303159)", },
};
unsigned int i;
for (i = 0; i < ARRAY_SIZE(try); i++)
test(try[i].str, "%p4cc", &try[i].code);
}
static void __init
errptr(void)
{
@@ -694,6 +711,7 @@ test_pointer(void)
flags();
errptr();
fwnode_pointer();
fourcc_pointer();
}
static void __init selftest(void)