Messages in this thread | | | Subject | Re: [PATCH v3 2/2] drm/fb-helper: implement ioctl FBIO_WAITFORVSYNC | From | Michel Dänzer <> | Date | Wed, 22 Feb 2017 16:05:31 +0900 |
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On 21/02/17 07:00 PM, Stefan Lengfeld wrote: > > 2/ Wait for a single vsync event on all active crtcs as Ville Syrjälä > described here [2] in the optimal implementation.
FWIW, this seems like a bad idea, since with multiple active CRTCs it would make it essentially random at which intervals the ioctl returns, and which CRTCs are in vertical blank when it does. So it would be useless for both timing and tearing prevention purposes, i.e. more or less completely useless.
-- Earthling Michel Dänzer | http://www.amd.com Libre software enthusiast | Mesa and X developer
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