Hello Juha-Pekka
We are seeing the CRC failures on Jasperlake systems. Sometimes the test passes and sometimes it fails throwing CRC error.
Regards Vidya
-----Original Message----- From: Juha-Pekka Heikkila juhapekka.heikkila@gmail.com Sent: Friday, May 21, 2021 5:00 PM To: Srinivas, Vidya vidya.srinivas@intel.com; intel-gfx@lists.freedesktop.org; dri-devel@lists.freedesktop.org; igt-dev@lists.freedesktop.org Cc: Lin, Charlton charlton.lin@intel.com Subject: Re: [igt-dev] [PATCH i-g-t] tests/kms_big_fb: Wait for vblank before collecting CRC
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@intel.com
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);