linux-kernel - Re: [PATCH v2] drm/vc4: Return -EBUSY if there's already a pending flip event.

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Message-ID: <8737pzlzfr.fsf@eliezer.anholt.net>
Date:	Tue, 03 May 2016 12:22:00 -0700
From:	Eric Anholt <eric@...olt.net>
To:	robert.foss@...labora.com, daniel.vetter@...ll.ch,
	airlied@...ux.ie, aniel.vetter@...ll.ch, fengguang.wu@...el.com,
	maarten.lankhorst@...ux.intel.com, julia.lawall@...6.fr,
	alexander.deucher@....com, daniels@...labora.com,
	derekf@....samsung.com, varadgautam@...il.com
Cc:	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	Robert Foss <robert.foss@...labora.com>
Subject: Re: [PATCH v2] drm/vc4: Return -EBUSY if there's already a pending flip event.

robert.foss@...labora.com writes:

> From: Robert Foss <robert.foss@...labora.com>
>
> As per the documentation in drm_crtc.h, atomic_commit should return
> -EBUSY if an asycnhronous update is requested and there is an earlier
> update pending.
>
> Note: docs cited here are drm_crtc.h, and the whole quote is:
>
>     *  - -EBUSY, if an asynchronous updated is requested and there is
>     *    an earlier updated pending. Drivers are allowed to support a queue
>     *    of outstanding updates, but currently no driver supports that.
>     *    Note that drivers must wait for preceding updates to complete if a
>     *    synchronous update is requested, they are not allowed to fail the
>     *    commit in that case.
>
> Signed-off-by: Robert Foss <robert.foss@...labora.com>

This looks good to me.  Let's give it a few days on the list for any
other KMS folks to catch anything.

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