[igt-dev] [PATCH 4/4] [RFC] tests/kms_big_fb: Wait for vblank before collecting CRC

[Vidya Srinivas]

Without wait for vblank, CRC mismatch is seen
between big and small CRC on some intel Gen11 platforms.

Change-Id: I3bec931aa901130997e693ac1cacf389e2a8100f
Signed-off-by: Vidya Srinivas <vidya.srinivas at intel.com>
---
 tests/kms_big_fb.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/tests/kms_big_fb.c b/tests/kms_big_fb.c
index b2027b6b9d1b..da682593429b 100644
--- a/tests/kms_big_fb.c
+++ b/tests/kms_big_fb.c
@@ -254,6 +254,7 @@ static void unset_lut(data_t *data)
 static bool test_plane(data_t *data)
 {
 	igt_plane_t *plane = data->plane;
+	igt_display_t *display = &data->display;
 	struct igt_fb *small_fb = &data->small_fb;
 	struct igt_fb *big_fb = &data->big_fb;
 	int w = data->big_fb_width - small_fb->width;
@@ -269,6 +270,7 @@ static bool test_plane(data_t *data)
 		{ w / 3, h * 3 / 4, },
 		{ w, h, },
 	};
+	bool check_platform_intel = is_i915_device(data->drm_fd);
 
 	if (!igt_plane_has_format_mod(plane, data->format, data->modifier))
 		return false;
@@ -336,17 +338,19 @@ static bool test_plane(data_t *data)
 
 		igt_display_commit2(&data->display, data->display.is_atomic ?
 				    COMMIT_ATOMIC : COMMIT_UNIVERSAL);
-
-
+		if (check_platform_intel)
+			igt_wait_for_vblank(data->drm_fd, display->pipes[data->pipe].crtc_offset);
 		igt_pipe_crc_collect_crc(data->pipe_crc, &small_crc);
 
 		igt_plane_set_fb(plane, big_fb);
 		igt_fb_set_position(big_fb, plane, x, y);
 		igt_fb_set_size(big_fb, plane, small_fb->width, small_fb->height);
+
 		igt_plane_set_size(plane, data->width, data->height);
 		igt_display_commit2(&data->display, data->display.is_atomic ?
 				    COMMIT_ATOMIC : COMMIT_UNIVERSAL);
-
+		if (check_platform_intel)
+			igt_wait_for_vblank(data->drm_fd, display->pipes[data->pipe].crtc_offset);
 		igt_pipe_crc_collect_crc(data->pipe_crc, &big_crc);
 
 		igt_plane_set_fb(plane, NULL);
-- 
2.26.2