[igt-dev] [PATCH] tests/kms_cursor_legacy: Fix assertion failure due to vblank mismatch

[Maarten Lankhorst]

Op 13-03-2019 om 21:41 schreef Chris Wilson:
> Quoting Nischala Yelchuri (2019-03-13 20:16:35)
>> For the !modeset case, after a pageflip is performed on both crtc's,
>> vblank counter is advanced by 1 when compared to its original value.
>>
>> For the modeset case, when pageflips and modesets are interleaved,
>> vblank counter does not always advance by 1 as nonblocking modeset
>> could fail, in which case we do not need vblank_matches.
> Having acknowledged the bug, try fixing it.
> -Chris
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Hey,

Not sure that's possible. We need access to all crtc_state's when reallocating ddb, and this means a pageflip on the first crtc is stalled while doing a modeset on another.

The page flip will be blocked on the nonblocking modeset to complete.

~Maarten