drm/format-helper: Type fixes in format-helper tests

Change the source-buffer type of le32buf_to_cpu() to __le32* to
reflect endianness. Result buffers are converted to local endianness,
so instantiate them from regular u8 or u32 types.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Maíra Canal <mcanal@igalia.com>
Reviewed-by: José Expósito <jose.exposito89@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230102112927.26565-6-tzimmermann@suse.de

drivers/gpu/drm/tests/drm_format_helper_test.c

@@ -279,7 +279,7 @@ static u16 *le16buf_to_cpu(struct kunit *test, const __le16 *buf, size_t buf_siz
 	return dst;
 }
 
-static u32 *le32buf_to_cpu(struct kunit *test, const u32 *buf, size_t buf_size)
+static u32 *le32buf_to_cpu(struct kunit *test, const __le32 *buf, size_t buf_size)
 {
 	u32 *dst = NULL;
 	int n;
@@ -323,7 +323,7 @@ static void drm_test_fb_xrgb8888_to_gray8(struct kunit *test)
 	const struct convert_xrgb8888_case *params = test->param_value;
 	const struct convert_to_gray8_result *result = &params->gray8_result;
 	size_t dst_size;
-	__u8 *buf = NULL;
+	u8 *buf = NULL;
 	__le32 *xrgb8888 = NULL;
 	struct iosys_map dst, src;
 
@@ -353,7 +353,7 @@ static void drm_test_fb_xrgb8888_to_rgb332(struct kunit *test)
 	const struct convert_xrgb8888_case *params = test->param_value;
 	const struct convert_to_rgb332_result *result = &params->rgb332_result;
 	size_t dst_size;
-	__u8 *buf = NULL;
+	u8 *buf = NULL;
 	__le32 *xrgb8888 = NULL;
 	struct iosys_map dst, src;
 
@@ -419,7 +419,7 @@ static void drm_test_fb_xrgb8888_to_rgb888(struct kunit *test)
 	const struct convert_xrgb8888_case *params = test->param_value;
 	const struct convert_to_rgb888_result *result = &params->rgb888_result;
 	size_t dst_size;
-	__u8 *buf = NULL;
+	u8 *buf = NULL;
 	__le32 *xrgb8888 = NULL;
 	struct iosys_map dst, src;
 
@@ -453,7 +453,7 @@ static void drm_test_fb_xrgb8888_to_xrgb2101010(struct kunit *test)
 	const struct convert_xrgb8888_case *params = test->param_value;
 	const struct convert_to_xrgb2101010_result *result = &params->xrgb2101010_result;
 	size_t dst_size;
-	__u32 *buf = NULL;
+	u32 *buf = NULL;
 	__le32 *xrgb8888 = NULL;
 	struct iosys_map dst, src;
 
@@ -475,7 +475,7 @@ static void drm_test_fb_xrgb8888_to_xrgb2101010(struct kunit *test)
 	iosys_map_set_vaddr(&src, xrgb8888);
 
 	drm_fb_xrgb8888_to_xrgb2101010(&dst, &result->dst_pitch, &src, &fb, &params->clip);
-	buf = le32buf_to_cpu(test, buf, dst_size / sizeof(u32));
+	buf = le32buf_to_cpu(test, (__force const __le32 *)buf, dst_size / sizeof(u32));
 	KUNIT_EXPECT_EQ(test, memcmp(buf, result->expected, dst_size), 0);
 }