drm/i915: Disable high-precision vblank timestamping for UMS
We only have sufficient information for accurate (sub-frame) timestamping when the modesetting is under our control. Reported-by: Chris Clayton <chris2553@googlemail.com> Tested-by: Chris Clayton <chris2553@googlemail.com> Reviewed-by: Mario Kleiner <mario.kleiner@tuebingen.mpg.de> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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@ -752,6 +752,9 @@ static int __init i915_init(void)
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driver.driver_features &= ~DRIVER_MODESET;
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#endif
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if (!(driver.driver_features & DRIVER_MODESET))
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driver.get_vblank_timestamp = NULL;
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return drm_init(&driver);
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}
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