From: Eric Anholt <eric@anholt.net>
To: DRI Development <dri-devel@lists.freedesktop.org>
Cc: David Airlie <airlied@linux.ie>,
Daniel Vetter <daniel.vetter@ffwll.ch>,
Gustavo Padovan <gustavo.padovan@collabora.co.uk>,
Daniel Vetter <daniel.vetter@intel.com>
Subject: Re: [PATCH 7/9] drm/gem-fb-helper: Always do implicit sync
Date: Fri, 20 Apr 2018 15:11:24 -0700 [thread overview]
Message-ID: <87bmedil4j.fsf@anholt.net> (raw)
In-Reply-To: <20180405154449.23038-8-daniel.vetter@ffwll.ch>
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Daniel Vetter <daniel.vetter@ffwll.ch> writes:
> I've done a lot of history digging. The first signs of this
> optimization was introduced in i915:
I can't come up with any reason this would matter. I almost came up
with "You're doing tearing X11 front buffer rendering, and you do a
modeset using the same fb, and so you block that modeset behind your
rendering." Except that:
1) who cares
2) this helper is only for dma-bufs, not normal X11 rendering
3) your X11 driver should be doing pageflipping to be tear-free anyway,
let's just fix that[1].
Reviewed-by: Eric Anholt <eric@anholt.net>
[1] This is not actually me volunteering myself or anyone else to go fix
that.
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next prev parent reply other threads:[~2018-04-20 22:11 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-05 15:44 [PATCH 0/9] implicit fencing clarification Daniel Vetter
2018-04-05 15:44 ` [PATCH 1/9] drm/vmwgfx: Remove no-op prepare/cleanup_fb callbacks Daniel Vetter
2018-04-05 17:06 ` Thomas Hellstrom
2018-04-05 19:59 ` Daniel Vetter
2018-04-05 15:44 ` [PATCH 2/9] drm: Move simple_display_pipe prepare_fb helper into gem fb helpers Daniel Vetter
2018-04-06 9:42 ` Noralf Trønnes
2018-04-09 8:42 ` Daniel Vetter
2018-04-09 15:23 ` David Lechner
2018-04-10 5:55 ` Oleksandr Andrushchenko
2018-04-05 15:44 ` [PATCH 3/9] drm/tve200: Use simple_display_pipe prepare_fb helper Daniel Vetter
2018-04-06 9:40 ` Linus Walleij
2018-04-05 15:44 ` [PATCH 4/9] drm/pl111: " Daniel Vetter
2018-04-05 15:44 ` [PATCH 5/9] drm/mxsfb: " Daniel Vetter
2018-04-20 21:54 ` Eric Anholt
2018-04-05 15:44 ` [PATCH 6/9] drm/atomic: better doc for implicit vs explicit fencing Daniel Vetter
2018-04-20 22:04 ` Eric Anholt
2018-04-24 12:01 ` Daniel Vetter
2018-04-05 15:44 ` [PATCH 7/9] drm/gem-fb-helper: Always do implicit sync Daniel Vetter
2018-04-20 22:11 ` Eric Anholt [this message]
2018-04-24 12:04 ` Daniel Vetter
2018-06-20 12:46 ` Daniel Vetter
2018-04-05 15:44 ` [PATCH 8/9] drm/vc4: Always obey " Daniel Vetter
2018-04-20 22:12 ` Eric Anholt
[not found] ` <20180405154449.23038-1-daniel.vetter-/w4YWyX8dFk@public.gmane.org>
2018-04-05 15:44 ` [PATCH 9/9] drm/msm: Always obey implicit fencing Daniel Vetter
[not found] ` <20180405154449.23038-10-daniel.vetter-/w4YWyX8dFk@public.gmane.org>
2018-06-20 9:12 ` Daniel Vetter
2018-04-06 7:38 ` [PATCH 0/9] implicit fencing clarification Oleksandr Andrushchenko
2018-04-09 8:44 ` Daniel Vetter
2018-04-09 8:51 ` [PATCH] drm/xen-front: use simple display pipe prepare_fb helper Daniel Vetter
2018-04-09 8:51 ` Daniel Vetter
2018-04-10 5:56 ` Oleksandr Andrushchenko
2018-04-10 5:56 ` Oleksandr Andrushchenko
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