From: Jesse Barnes <jbarnes@virtuousgeek.org>
To: "Ville Syrjälä" <ville.syrjala@linux.intel.com>
Cc: intel-gfx@lists.freedesktop.org
Subject: Re: [RFC] Async flips
Date: Wed, 31 Oct 2012 08:23:49 -0700 [thread overview]
Message-ID: <20121031082349.37933396@jbarnes-desktop> (raw)
In-Reply-To: <20121031125324.GD3791@intel.com>
On Wed, 31 Oct 2012 14:53:24 +0200
Ville Syrjälä <ville.syrjala@linux.intel.com> wrote:
> On Tue, Oct 30, 2012 at 01:33:47PM -0500, Jesse Barnes wrote:
> > The hw supports async flips through the render ring, so why not expose it?
> > It gives us one more "tear me harder" option we can use in the DDX and
> > for other cases where simply flipping to the latest buffer is more
> > important than visual quality.
>
> The only reason I can see why anyone would really want async flips is
> when you're restricted to double buffering. With triple buffering you
> should be able to override the previous flip w/o tearing.
>
> Well, actually if you use the ring based flips, then you can't do the
> override. My atomic page flip code can do it because it's using mmio
> flips. There were also other reasons favoring mmio over ring.
>
> Once the atomic code is deemed ready, I would suggest we just nuke the
> ring based flip code (pun intended).
Yeah, I agree. In fact one of the first versions of the flip code used
mmio, and I think it's a better way to go.
I think you're correct about triple buffering, but I don't know if our
DDX does the right thing here these days or not (by default).
--
Jesse Barnes, Intel Open Source Technology Center
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next prev parent reply other threads:[~2012-10-31 15:23 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-30 18:33 [RFC] Async flips Jesse Barnes
2012-10-30 18:33 ` [PATCH 1/2] drm: add flags argument to crtc page_flip callback Jesse Barnes
2012-11-02 4:29 ` Mario Kleiner
2012-11-02 16:00 ` Jesse Barnes
2012-10-30 18:33 ` [PATCH 2/2] drm/i915: add async flip support on gen7 Jesse Barnes
2012-10-31 17:47 ` Eric Anholt
2012-10-31 19:24 ` Jesse Barnes
2012-10-31 12:53 ` [RFC] Async flips Ville Syrjälä
2012-10-31 15:23 ` Jesse Barnes [this message]
2012-10-31 15:26 ` Daniel Vetter
2012-10-31 15:39 ` Jesse Barnes
2012-10-31 15:49 ` Chris Wilson
2012-10-31 16:03 ` Daniel Vetter
2012-10-31 16:27 ` Jesse Barnes
2012-10-31 16:05 ` Ville Syrjälä
2012-10-31 17:44 ` Eric Anholt
2012-10-31 18:51 ` Ville Syrjälä
2012-11-02 4:45 ` Mario Kleiner
2012-11-02 9:29 ` Ville Syrjälä
2012-11-12 3:53 ` Mario Kleiner
2012-11-12 12:04 ` Ville Syrjälä
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