diff --git a/drivers/gpu/drm/tests/drm_format_helper_test.c b/drivers/gpu/drm/tests/drm_format_helper_test.c
index 79bc9d4bbd71..b888f7334510 100644
--- a/drivers/gpu/drm/tests/drm_format_helper_test.c
+++ b/drivers/gpu/drm/tests/drm_format_helper_test.c
@@ -643,6 +643,18 @@ static void drm_test_fb_xrgb8888_to_rgb565(struct kunit *test)
 	drm_fb_xrgb8888_to_rgb565(&dst, &result->dst_pitch, &src, &fb, &params->clip, true);
 	buf = le16buf_to_cpu(test, (__force const __le16 *)buf, dst_size / sizeof(__le16));
 	KUNIT_EXPECT_MEMEQ(test, buf, result->expected_swab, dst_size);
+
+	buf = dst.vaddr;
+	memset(buf, 0, TEST_BUF_SIZE);
+
+	int blit_result = 0;
+
+	blit_result = drm_fb_blit(&dst, dst_pitch, DRM_FORMAT_RGB565, &src, &fb, &params->clip);
+
+	buf = le16buf_to_cpu(test, (__force const __le16 *)buf, dst_size / sizeof(__le16));
+
+	KUNIT_EXPECT_FALSE(test, blit_result);
+	KUNIT_EXPECT_MEMEQ(test, buf, result->expected, dst_size);
 }
 
 static void drm_test_fb_xrgb8888_to_xrgb1555(struct kunit *test)
@@ -677,6 +689,18 @@ static void drm_test_fb_xrgb8888_to_xrgb1555(struct kunit *test)
 	drm_fb_xrgb8888_to_xrgb1555(&dst, dst_pitch, &src, &fb, &params->clip);
 	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 */
+	memset(buf, 0, TEST_BUF_SIZE);
+
+	int blit_result = 0;
+
+	blit_result = drm_fb_blit(&dst, dst_pitch, DRM_FORMAT_XRGB1555, &src, &fb, &params->clip);
+
+	buf = le16buf_to_cpu(test, (__force const __le16 *)buf, dst_size / sizeof(__le16));
+
+	KUNIT_EXPECT_FALSE(test, blit_result);
+	KUNIT_EXPECT_MEMEQ(test, buf, result->expected, dst_size);
 }
 
 static void drm_test_fb_xrgb8888_to_argb1555(struct kunit *test)
@@ -711,6 +735,18 @@ static void drm_test_fb_xrgb8888_to_argb1555(struct kunit *test)
 	drm_fb_xrgb8888_to_argb1555(&dst, dst_pitch, &src, &fb, &params->clip);
 	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 */
+	memset(buf, 0, TEST_BUF_SIZE);
+
+	int blit_result = 0;
+
+	blit_result = drm_fb_blit(&dst, dst_pitch, DRM_FORMAT_ARGB1555, &src, &fb, &params->clip);
+
+	buf = le16buf_to_cpu(test, (__force const __le16 *)buf, dst_size / sizeof(__le16));
+
+	KUNIT_EXPECT_FALSE(test, blit_result);
+	KUNIT_EXPECT_MEMEQ(test, buf, result->expected, dst_size);
 }
 
 static void drm_test_fb_xrgb8888_to_rgba5551(struct kunit *test)
@@ -745,6 +781,18 @@ static void drm_test_fb_xrgb8888_to_rgba5551(struct kunit *test)
 	drm_fb_xrgb8888_to_rgba5551(&dst, dst_pitch, &src, &fb, &params->clip);
 	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 */
+	memset(buf, 0, TEST_BUF_SIZE);
+
+	int blit_result = 0;
+
+	blit_result = drm_fb_blit(&dst, dst_pitch, DRM_FORMAT_RGBA5551, &src, &fb, &params->clip);
+
+	buf = le16buf_to_cpu(test, (__force const __le16 *)buf, dst_size / sizeof(__le16));
+
+	KUNIT_EXPECT_FALSE(test, blit_result);
+	KUNIT_EXPECT_MEMEQ(test, buf, result->expected, dst_size);
 }
 
 static void drm_test_fb_xrgb8888_to_rgb888(struct kunit *test)
@@ -782,6 +830,16 @@ static void drm_test_fb_xrgb8888_to_rgb888(struct kunit *test)
 
 	drm_fb_xrgb8888_to_rgb888(&dst, dst_pitch, &src, &fb, &params->clip);
 	KUNIT_EXPECT_MEMEQ(test, buf, result->expected, dst_size);
+
+	buf = dst.vaddr; /* restore original value of buf */
+	memset(buf, 0, TEST_BUF_SIZE);
+
+	int blit_result = 0;
+
+	blit_result = drm_fb_blit(&dst, dst_pitch, DRM_FORMAT_RGB888, &src, &fb, &params->clip);
+
+	KUNIT_EXPECT_FALSE(test, blit_result);
+	KUNIT_EXPECT_MEMEQ(test, buf, result->expected, dst_size);
 }
 
 static void drm_test_fb_xrgb8888_to_argb8888(struct kunit *test)
@@ -816,6 +874,18 @@ static void drm_test_fb_xrgb8888_to_argb8888(struct kunit *test)
 	drm_fb_xrgb8888_to_argb8888(&dst, dst_pitch, &src, &fb, &params->clip);
 	buf = le32buf_to_cpu(test, (__force const __le32 *)buf, dst_size / sizeof(u32));
 	KUNIT_EXPECT_MEMEQ(test, buf, result->expected, dst_size);
+
+	buf = dst.vaddr; /* restore original value of buf */
+	memset(buf, 0, TEST_BUF_SIZE);
+
+	int blit_result = 0;
+
+	blit_result = drm_fb_blit(&dst, dst_pitch, DRM_FORMAT_ARGB8888, &src, &fb, &params->clip);
+
+	buf = le32buf_to_cpu(test, (__force const __le32 *)buf, dst_size / sizeof(u32));
+
+	KUNIT_EXPECT_FALSE(test, blit_result);
+	KUNIT_EXPECT_MEMEQ(test, buf, result->expected, dst_size);
 }
 
 static void drm_test_fb_xrgb8888_to_xrgb2101010(struct kunit *test)
@@ -850,6 +920,17 @@ static void drm_test_fb_xrgb8888_to_xrgb2101010(struct kunit *test)
 	drm_fb_xrgb8888_to_xrgb2101010(&dst, dst_pitch, &src, &fb, &params->clip);
 	buf = le32buf_to_cpu(test, buf, dst_size / sizeof(u32));
 	KUNIT_EXPECT_MEMEQ(test, buf, result->expected, dst_size);
+
+	buf = dst.vaddr; /* restore original value of buf */
+	memset(buf, 0, TEST_BUF_SIZE);
+
+	int blit_result = 0;
+
+	blit_result = drm_fb_blit(&dst, dst_pitch, DRM_FORMAT_XRGB2101010, &src, &fb,
+				  &params->clip);
+
+	KUNIT_EXPECT_FALSE(test, blit_result);
+	KUNIT_EXPECT_MEMEQ(test, buf, result->expected, dst_size);
 }
 
 static void drm_test_fb_xrgb8888_to_argb2101010(struct kunit *test)
@@ -884,6 +965,19 @@ static void drm_test_fb_xrgb8888_to_argb2101010(struct kunit *test)
 	drm_fb_xrgb8888_to_argb2101010(&dst, dst_pitch, &src, &fb, &params->clip);
 	buf = le32buf_to_cpu(test, (__force const __le32 *)buf, dst_size / sizeof(u32));
 	KUNIT_EXPECT_MEMEQ(test, buf, result->expected, dst_size);
+
+	buf = dst.vaddr; /* restore original value of buf */
+	memset(buf, 0, TEST_BUF_SIZE);
+
+	int blit_result = 0;
+
+	blit_result = drm_fb_blit(&dst, dst_pitch, DRM_FORMAT_ARGB2101010, &src, &fb,
+				  &params->clip);
+
+	buf = le32buf_to_cpu(test, (__force const __le32 *)buf, dst_size / sizeof(u32));
+
+	KUNIT_EXPECT_FALSE(test, blit_result);
+	KUNIT_EXPECT_MEMEQ(test, buf, result->expected, dst_size);
 }
 
 static void drm_test_fb_xrgb8888_to_mono(struct kunit *test)
@@ -951,6 +1045,41 @@ static void drm_test_fb_swab(struct kunit *test)
 	drm_fb_swab(&dst, dst_pitch, &src, &fb, &params->clip, false);
 	buf = le32buf_to_cpu(test, (__force const __le32 *)buf, dst_size / sizeof(u32));
 	KUNIT_EXPECT_MEMEQ(test, buf, result->expected, dst_size);
+
+	buf = dst.vaddr; /* restore original value of buf */
+	memset(buf, 0, TEST_BUF_SIZE);
+
+	int blit_result;
+
+	blit_result = drm_fb_blit(&dst, dst_pitch, DRM_FORMAT_XRGB8888 | DRM_FORMAT_BIG_ENDIAN,
+				  &src, &fb, &params->clip);
+	buf = le32buf_to_cpu(test, (__force const __le32 *)buf, dst_size / sizeof(u32));
+
+	KUNIT_EXPECT_FALSE(test, blit_result);
+	KUNIT_EXPECT_MEMEQ(test, buf, result->expected, dst_size);
+
+	buf = dst.vaddr;
+	memset(buf, 0, TEST_BUF_SIZE);
+
+	blit_result = drm_fb_blit(&dst, dst_pitch, DRM_FORMAT_BGRX8888, &src, &fb, &params->clip);
+	buf = le32buf_to_cpu(test, (__force const __le32 *)buf, dst_size / sizeof(u32));
+
+	KUNIT_EXPECT_FALSE(test, blit_result);
+	KUNIT_EXPECT_MEMEQ(test, buf, result->expected, dst_size);
+
+	buf = dst.vaddr;
+	memset(buf, 0, TEST_BUF_SIZE);
+
+	struct drm_format_info mock_format = *fb.format;
+
+	mock_format.format |= DRM_FORMAT_BIG_ENDIAN;
+	fb.format = &mock_format;
+
+	blit_result = drm_fb_blit(&dst, dst_pitch, DRM_FORMAT_XRGB8888, &src, &fb, &params->clip);
+	buf = le32buf_to_cpu(test, (__force const __le32 *)buf, dst_size / sizeof(u32));
+
+	KUNIT_EXPECT_FALSE(test, blit_result);
+	KUNIT_EXPECT_MEMEQ(test, buf, result->expected, dst_size);
 }
 
 struct clip_offset_case {
@@ -1543,6 +1672,19 @@ static void drm_test_fb_memcpy(struct kunit *test)
 		KUNIT_EXPECT_MEMEQ_MSG(test, buf[i], expected[i], dst_size[i],
 				       "Failed expectation on plane %zu", i);
 	}
+
+	memset(*buf, 0, TEST_BUF_SIZE * DRM_FORMAT_MAX_PLANES);
+
+	int blit_result;
+
+	blit_result = drm_fb_blit(dst, dst_pitches, params->format, src, &fb, &params->clip);
+
+	KUNIT_EXPECT_FALSE(test, blit_result);
+	for (size_t i = 0; i < fb.format->num_planes; i++) {
+		expected[i] = cpubuf_to_le32(test, params->expected[i], TEST_BUF_SIZE);
+		KUNIT_EXPECT_MEMEQ_MSG(test, buf[i], expected[i], dst_size[i],
+				       "Failed expectation on plane %zu", i);
+	}
 }
 
 static struct kunit_case drm_format_helper_test_cases[] = {
