From: Jesse Barnes <jbarnes@virtuousgeek.org>
To: Daniel Vetter <daniel@ffwll.ch>
Cc: intel-gfx@lists.freedesktop.org
Subject: Re: [RFC] Async flips
Date: Wed, 31 Oct 2012 08:39:09 -0700 [thread overview]
Message-ID: <20121031083909.7c2eecec@jbarnes-desktop> (raw)
In-Reply-To: <CAKMK7uEFw8BDEvb7dGq0HToX5U_J62H_QUZst_8deQSc+OvzUg@mail.gmail.com>
On Wed, 31 Oct 2012 16:26:54 +0100
Daniel Vetter <daniel@ffwll.ch> wrote:
> On Wed, Oct 31, 2012 at 4:23 PM, Jesse Barnes <jbarnes@virtuousgeek.org> 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.
>
> How are we gonna sync up with outstanding rendering before issuing the
> flip? If the answer is involves enabling the render irq, I'm not gonna
> like it ;-)
Why are you afraid of irqs when rendering is active? We'll already be
awake at those times anyway...
--
Jesse Barnes, Intel Open Source Technology Center
next prev parent reply other threads:[~2012-10-31 15:39 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
2012-10-31 15:26 ` Daniel Vetter
2012-10-31 15:39 ` Jesse Barnes [this message]
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20121031083909.7c2eecec@jbarnes-desktop \
--to=jbarnes@virtuousgeek.org \
--cc=daniel@ffwll.ch \
--cc=intel-gfx@lists.freedesktop.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.