Patch "drm/format-helper: Fix test on big endian architectures" has been added to the 6.0-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    drm/format-helper: Fix test on big endian architectures

to the 6.0-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-format-helper-fix-test-on-big-endian-architectur.patch
and it can be found in the queue-6.0 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 7187781d0039c9ef7cabfe54aed40e8c285af5bd
Author: José Expósito <jose.exposito89@xxxxxxxxx>
Date:   Wed Jul 27 01:09:13 2022 +0200

    drm/format-helper: Fix test on big endian architectures
    
    [ Upstream commit 18c8485236a5e3f491b670c018ae391c9cb84dfa ]
    
    The tests fail on big endian architectures, like PowerPC:
    
     $ ./tools/testing/kunit/kunit.py run \
       --kunitconfig=drivers/gpu/drm/tests \
       --arch=powerpc --cross_compile=powerpc64-linux-gnu-
    
    Transform the XRGB8888 buffer from little endian to the CPU endian
    before calling the conversion function to avoid this error.
    
    Fixes: 8f456104915f ("drm/format-helper: Add KUnit tests for drm_fb_xrgb8888_to_rgb332()")
    Reported-by: David Gow <davidgow@xxxxxxxxxx>
    Reviewed-by: David Gow <davidgow@xxxxxxxxxx>
    Signed-off-by: José Expósito <jose.exposito89@xxxxxxxxx>
    Link: https://patchwork.freedesktop.org/patch/msgid/20220726230916.390575-2-jose.exposito89@xxxxxxxxx
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/gpu/drm/tests/drm_format_helper_test.c b/drivers/gpu/drm/tests/drm_format_helper_test.c
index 98583bf56044..eefaba3aaea2 100644
--- a/drivers/gpu/drm/tests/drm_format_helper_test.c
+++ b/drivers/gpu/drm/tests/drm_format_helper_test.c
@@ -111,6 +111,21 @@ static size_t conversion_buf_size(u32 dst_format, unsigned int dst_pitch,
 	return dst_pitch * drm_rect_height(clip);
 }
 
+static u32 *le32buf_to_cpu(struct kunit *test, const u32 *buf, size_t buf_size)
+{
+	u32 *dst = NULL;
+	int n;
+
+	dst = kunit_kzalloc(test, sizeof(*dst) * buf_size, GFP_KERNEL);
+	if (!dst)
+		return NULL;
+
+	for (n = 0; n < buf_size; n++)
+		dst[n] = le32_to_cpu((__force __le32)buf[n]);
+
+	return dst;
+}
+
 static void xrgb8888_to_rgb332_case_desc(struct xrgb8888_to_rgb332_case *t,
 					 char *desc)
 {
@@ -125,6 +140,7 @@ static void xrgb8888_to_rgb332_test(struct kunit *test)
 	const struct xrgb8888_to_rgb332_case *params = test->param_value;
 	size_t dst_size;
 	__u8 *dst = NULL;
+	__u32 *src = NULL;
 
 	struct drm_framebuffer fb = {
 		.format = drm_format_info(DRM_FORMAT_XRGB8888),
@@ -138,8 +154,11 @@ static void xrgb8888_to_rgb332_test(struct kunit *test)
 	dst = kunit_kzalloc(test, dst_size, GFP_KERNEL);
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, dst);
 
-	drm_fb_xrgb8888_to_rgb332(dst, params->dst_pitch, params->xrgb8888,
-				  &fb, &params->clip);
+	src = le32buf_to_cpu(test, params->xrgb8888, TEST_BUF_SIZE);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, src);
+
+	drm_fb_xrgb8888_to_rgb332(dst, params->dst_pitch, src, &fb,
+				  &params->clip);
 	KUNIT_EXPECT_EQ(test, memcmp(dst, params->expected, dst_size), 0);
 }