Hi Vidya,
on which machines this would help? I see there's many vblanks already
being waited. There's igt_display_commit2 which probably will block and
even if it didn't there's igt_pipe_crc_collect_crc(..) where crc
calculation is started after flip and then get one crc before disabling
crc counting again.
/Juha-Pekka
On 21.5.2021 7.08, Vidya Srinivas wrote:
Without wait for vblank, CRC mismatch is seen
between big and small CRC on few systems
Change-Id: I3bec931aa901130997e693ac1cacf389e2a8100f
Signed-off-by: Vidya Srinivas <vidya.srinivas@xxxxxxxxx>
---
tests/kms_big_fb.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/tests/kms_big_fb.c b/tests/kms_big_fb.c
index b2027b6b9d1b..7d78ff829d41 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;
@@ -337,16 +338,17 @@ static bool test_plane(data_t *data)
igt_display_commit2(&data->display, data->display.is_atomic ?
COMMIT_ATOMIC : COMMIT_UNIVERSAL);
-
+ 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);
-
+ 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);
