From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
The kernel might mistakenly send out a zeroed vblank timestamp when
the vblank wait gets terminated early due to crtc disable. Add an
assertion to catch that.
Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
---
tests/kms_flip.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/tests/kms_flip.c b/tests/kms_flip.c
index 92f4eb5..e8a0b39 100644
--- a/tests/kms_flip.c
+++ b/tests/kms_flip.c
@@ -396,6 +396,9 @@ static int __wait_for_vblank(unsigned int flags, int crtc_idx,
ret = drmWaitVBlank(drm_fd, &wait_vbl);
if (ret == 0) {
+ igt_assert_f(wait_vbl.reply.tval_sec != 0 ||
+ wait_vbl.reply.tval_usec != 0,
+ "zeroed vblank timestamp\n");
reply->ts.tv_sec = wait_vbl.reply.tval_sec;
reply->ts.tv_usec = wait_vbl.reply.tval_usec;
reply->sequence = wait_vbl.reply.sequence;
--
1.8.5.5
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