linux-kernel - Re: [PATCH v5 4/4] drm/fence: add out-fences support

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Date:   Thu, 20 Oct 2016 13:55:38 -0200
From:   Gustavo Padovan <gustavo.padovan@...labora.com>
To:     Ville Syrjälä <ville.syrjala@...ux.intel.com>
Cc:     Gustavo Padovan <gustavo@...ovan.org>,
        dri-devel@...ts.freedesktop.org, marcheu@...gle.com,
        Daniel Stone <daniels@...labora.com>, seanpaul@...gle.com,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        linux-kernel@...r.kernel.org, laurent.pinchart@...asonboard.com,
        Gustavo Padovan <gustavo.padovan@...labora.co.uk>,
        John Harrison <John.C.Harrison@...el.com>, m.chehab@...sung.com
Subject: Re: [PATCH v5 4/4] drm/fence: add out-fences support

2016-10-20 Ville Syrjälä <ville.syrjala@...ux.intel.com>:

> On Thu, Oct 20, 2016 at 12:50:05PM -0200, Gustavo Padovan wrote:
> > From: Gustavo Padovan <gustavo.padovan@...labora.co.uk>
> > 
> > Support DRM out-fences by creating a sync_file with a fence for each CRTC
> > that sets the OUT_FENCE_PTR property.
> 
> I still maintain the out fence should also be per fb (well, per plane
> since we can't add it to fbs). Otherwise it's not going to be at all
> useful if you do fps>vrefresh and don't include the same set of planes
> in every atomic ioctl, eg. if you only ever include ones that are
> somehow dirty.

How would the kernel signal these dirty planes then? Right now we signal
at the vblank.

Gustavo