[PATCH i-g-t v5 3/6] tests/kms_writeback: Add intel check for vendor-specific restriction

[Sowmiya S <sowmiya.s@intel.com>]

Add intel checks for vendor specific restriction.
Disallow empty FB as writeback FB only for Intel.

v4: Restore drm_fd added in struct and access it from
    igt_display_t struct (Suraj)
v5: Revise commit message and subject with detailed
    explanation. (Suraj)

Signed-off-by: Sowmiya S <sowmiya.s@intel.com>
---
 tests/kms_writeback.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/tests/kms_writeback.c b/tests/kms_writeback.c
index 691774777..defe43686 100644
--- a/tests/kms_writeback.c
+++ b/tests/kms_writeback.c
@@ -291,7 +291,7 @@ static void writeback_fb_id(igt_output_t *output, igt_fb_t *valid_fb, igt_fb_t *
 
 	/* Zero WRITEBACK_FB_ID */
 	ret = do_writeback_test(output, 0, NULL, false);
-	igt_assert_eq(ret, 0);
+	igt_assert_eq(ret, is_intel_device(output->display->drm_fd) ? -EINVAL : 0);
 
 	/* Valid output buffer */
 	ret = do_writeback_test(output, valid_fb->fb_id, NULL, false);
@@ -406,7 +406,8 @@ static void writeback_check_output(igt_output_t *output, igt_plane_t *plane,
 
 	/* Two commits, the second with no writeback */
 	out_fbs[0] = output_fb;
-	writeback_sequence(output, plane, input_fb, out_fbs, 2, fourcc_color);
+	if (!is_intel_device(output->display->drm_fd))
+		writeback_sequence(output, plane, input_fb, out_fbs, 2, fourcc_color);
 
 	/* Two commits, both with writeback */
 	out_fbs[1] = output_fb;
-- 
2.43.0