linux-kernel - Re: [PATCH 3/3] drm: Add CRTC_GET_SEQUENCE and CRTC_QUEUE

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Message-ID: <86fue9bf2k.fsf@keithp.com>
Date:   Thu, 06 Jul 2017 11:22:43 -0700
From:   Keith Packard <keithp@...thp.com>
To:     Ville Syrjälä <ville.syrjala@...ux.intel.com>
Cc:     Daniel Vetter <daniel@...ll.ch>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Dave Airlie <airlied@...hat.com>,
        dri-devel <dri-devel@...ts.freedesktop.org>
Subject: Re: [PATCH 3/3] drm: Add CRTC_GET_SEQUENCE and CRTC_QUEUE_SEQUENCE ioctls

Ville Syrjälä <ville.syrjala@...ux.intel.com> writes:

> I was mostly thinking of the 'seq = query(); wait(seq + n);' pattern
> where we can avoid doing the full update more than once if we enable
> the interrupt already during the query.

Don't we still wait 5 seconds before disabling vblank? In that case, the
chances of hitting an idle vblank are pretty slim if the application is
actually busy.

-- 
-keith

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