linux-kernel - Re: [Intel-gfx] [RFC PATCH 3/3] i915: ignore lid open event when resuming

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Date:	Mon, 28 Jan 2013 00:21:24 +0100
From:	Daniel Vetter <daniel@...ll.ch>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Zhang Rui <rui.zhang@...el.com>, linux-kernel@...r.kernel.org,
	linux-pm@...r.kernel.org, linux-acpi@...r.kernel.org,
	intel-gfx@...ts.freedesktop.org, lenb@...nel.org
Subject: Re: [Intel-gfx] [RFC PATCH 3/3] i915: ignore lid open event when resuming

On Sun, Jan 27, 2013 at 11:21 PM, Rafael J. Wysocki <rjw@...k.pl> wrote:
>> Given that this essentially requires users to manually set this module
>> option to make stuff work I don't like this.
>>
>> I see a few possible options:
>> - plug the races between all the different parts - I've never really
>> understood why acpi sends us events before the resume code has
>> completed ...
>
> This particular one may be a result of patch [2/3] in the series,
> actually, because that patch makes SCI work over the whole cycle.
>
>> If that's indeed intentional, we could delay the
>> handling a bit until at least the i915 resume code completed.
>
> I would do that for now at least if possible.  It shouldn't hurt anyway.

Since I lack a bit clue about how the pm stuff works exactly: Is there
a ready-made helper for that kind of synchronization, where a notifier
callback can be called from a different device's resume callbacks,
which is someplace completely unrelated in the device-tree? Or any
anti-patterns to avoid?
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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