From: Matthew Garrett <mjg59@srcf.ucam.org>
To: "Michel Dänzer" <michel@daenzer.net>
Cc: intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org,
Mario Kleiner <mario.kleiner@tuebingen.mpg.de>
Subject: Re: [RFC] Reduce idle vblank wakeups
Date: Wed, 16 Nov 2011 17:11:22 +0000 [thread overview]
Message-ID: <20111116171122.GA28222@srcf.ucam.org> (raw)
In-Reply-To: <1321462995.3794.18.camel@thor.local>
On Wed, Nov 16, 2011 at 06:03:15PM +0100, Michel Dänzer wrote:
> I thought the main reason for the delay wasn't broken hardware but to
> avoid constantly ping-ponging the vblank IRQ between on and off with
> apps which regularly neeed the vblank counter value, as that could make
> the counter unreliable. Maybe I'm misremembering though.
If turning it on and off results in the counter value being wrong then
surely that's a hardware problem? I've tested that turning it on and off
between every IRQ still gives valid counter values on sandybridge.
--
Matthew Garrett | mjg59@srcf.ucam.org
next prev parent reply other threads:[~2011-11-16 17:11 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-16 14:20 [RFC] Reduce idle vblank wakeups Matthew Garrett
2011-11-16 14:20 ` [RFC 1/3] drm: Make drm_vblank_offdelay per-device Matthew Garrett
2011-11-16 14:20 ` [RFC 2/3] drm: Handle the vblank_offdelay=0 case properly Matthew Garrett
2011-11-16 14:20 ` [RFC 3/3] i915: Drop vblank_offdelay Matthew Garrett
2011-11-16 14:32 ` [RFC] Reduce idle vblank wakeups Adam Jackson
2011-11-16 17:03 ` Michel Dänzer
2011-11-16 17:11 ` Matthew Garrett [this message]
2011-11-16 17:53 ` [Intel-gfx] " Andrew Lutomirski
2011-11-16 18:27 ` Mario Kleiner
2011-11-16 18:48 ` Matthew Garrett
2011-11-17 0:26 ` Mario Kleiner
2011-11-17 2:19 ` Matthew Garrett
2011-11-17 5:36 ` [Intel-gfx] " Andrew Lutomirski
2011-11-17 5:39 ` [RFC PATCH] drm: Fix off-by-one races on vblank disable Andy Lutomirski
2012-05-04 18:31 ` [Intel-gfx] [RFC] Reduce idle vblank wakeups Matthew Garrett
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