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drm/format-helper: Split off byte swapping from drm_fb_xrgb8888_to_rgb565()

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Move big-endian support from drm_fb_xrgb8888_to_rgb565() into the new
helper drm_xrgb8888_to_rgb565be(). The functionality is required for
displays with big-endian byte order. Update all callers.

With the change applied, drm_fb_xrgb8888_to_rgb565() has the same
signature as the other conversion functions, which is required for
further updates to drm_fb_blit(). Also makes the format-conversion
helper available to panic handlers, if necessary.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com>
Link: https://lore.kernel.org/r/20250625114911.1121301-1-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann
2025-06-25 13:48:22 +02:00
parent b462b0ef4d
commit 8ad00a81d7
6 changed files with 72 additions and 33 deletions
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8
drivers/gpu/drm/tests/drm_format_helper_test.c
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@@ -735,13 +735,13 @@ static void drm_test_fb_xrgb8888_to_rgb565(struct kunit *test)
NULL : &result->dst_pitch;
drm_fb_xrgb8888_to_rgb565(&dst, dst_pitch, &src, &fb, &params->clip,
&fmtcnv_state, false);
&fmtcnv_state);
buf = le16buf_to_cpu(test, (__force const __le16 *)buf, dst_size / sizeof(__le16));
KUNIT_EXPECT_MEMEQ(test, buf, result->expected, dst_size);
buf = dst.vaddr; /* restore original value of buf */
drm_fb_xrgb8888_to_rgb565(&dst, &result->dst_pitch, &src, &fb, &params->clip,
&fmtcnv_state, true);
drm_fb_xrgb8888_to_rgb565be(&dst, &result->dst_pitch, &src, &fb, &params->clip,
&fmtcnv_state);
buf = le16buf_to_cpu(test, (__force const __le16 *)buf, dst_size / sizeof(__le16));
KUNIT_EXPECT_MEMEQ(test, buf, result->expected_swab, dst_size);
@@ -749,7 +749,7 @@ static void drm_test_fb_xrgb8888_to_rgb565(struct kunit *test)
memset(buf, 0, dst_size);
drm_fb_xrgb8888_to_rgb565(&dst, dst_pitch, &src, &fb, &params->clip,
&fmtcnv_state, false);
&fmtcnv_state);
buf = le16buf_to_cpu(test, (__force const __le16 *)buf, dst_size / sizeof(__le16));
KUNIT_EXPECT_MEMEQ(test, buf, result->expected, dst_size);
}