From af612e43de6d27df51a7636229be7d33fe3ab7b5 Mon Sep 17 00:00:00 2001
From: Sakari Ailus <sakari.ailus@linux.intel.com>
Date: Tue, 16 Feb 2021 17:57:20 +0200
Subject: 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
---
 lib/test_printf.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

(limited to 'lib/test_printf.c')

diff --git a/lib/test_printf.c b/lib/test_printf.c
index 7ac87f18a10f..7ee0b4e17b21 100644
--- a/lib/test_printf.c
+++ b/lib/test_printf.c
@@ -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)
-- 
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