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

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Message-ID: <5732182E.6090100@collabora.com>
Date:	Tue, 10 May 2016 13:19:42 -0400
From:	Robert Foss <robert.foss@...labora.com>
To:	Eric Anholt <eric@...olt.net>, 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
Subject: Re: [PATCH v2] drm/vc4: Return -EBUSY if there's already a pending
 flip event.

Thanks Eric!

On 2016-05-10 01:06 PM, Eric Anholt wrote:
> Robert Foss <robert.foss@...labora.com> writes:
>
>> On 2016-05-03 03:22 PM, Eric Anholt wrote:
>>> 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.
>>>
>>
>> I haven't seen any further feedback regarding this patch.
>> Does anyone have objections to it being merged?
>
> I merged it to drm-vc4-next last night, actually :)
>