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

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Date:   Thu, 6 Jul 2017 21:59:21 +0300
From:   Ville Syrjälä <ville.syrjala@...ux.intel.com>
To:     Keith Packard <keithp@...thp.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

On Thu, Jul 06, 2017 at 11:22:43AM -0700, Keith Packard wrote:
> 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.

With the disable_immediate thing we only wait until the next vblank
before disabling the irq again.

-- 
Ville Syrjälä
Intel OTC