[igt-dev] [PATCH i-g-t v2] tests/kms_dp_tiled_display: Increase the time limit to receive all page flips

[Karthik B S <karthik.b.s@intel.com>]

Increasing the time limit from 10us to 20us, within which
page flip events must be received from all the tiles.

We've seen that in a few corner cases the test fails with the existing time
limit of 10us. Increasing the time limit to 20us to accommodate this.

As the increased time limit of 20us is still in the same blanking
interval, there is no change in the test functionality.

v2: Add more justification in the commit message. (uma)

Signed-off-by: Karthik B S <karthik.b.s@intel.com>
---
 tests/kms_dp_tiled_display.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tests/kms_dp_tiled_display.c b/tests/kms_dp_tiled_display.c
index b1160fee..6d19fea6 100644
--- a/tests/kms_dp_tiled_display.c
+++ b/tests/kms_dp_tiled_display.c
@@ -362,9 +362,9 @@ static void page_flip_handler(int fd, unsigned int seq,
 
 	/*
 	 * For seamless tear-free display, the page flip event timestamps
-	 * from all the tiles should not differ by more than 10us.
+	 * from all the tiles should not differ by more than 20us.
 	 */
-	igt_fail_on_f(labs(usec) >= 10, "Delayed page flip event from CRTC:%d at %u:%u\n",
+	igt_fail_on_f(labs(usec) >= 20, "Delayed page flip event from CRTC:%d at %u:%u\n",
 		      crtc_id, tv_sec, tv_usec);
 }
 
-- 
2.22.0

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