linux-kernel - Re: [PATCH 2/5] mmc: dw_mmc: Add suspend/resume callbacks; disable irq during suspend

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Date:	Tue, 9 Jul 2013 22:17:51 +0100
From:	James Hogan <james.hogan@...tec.com>
To:	Doug Anderson <dianders@...omium.org>
Cc:	Chris Ball <cjb@...top.org>, Olof Johansson <olof@...om.net>,
	Jaehoon Chung <jh80.chung@...sung.com>,
	Seungwon Jeon <tgih.jun@...sung.com>,
	Grant Grundler <grundler@...omium.org>,
	Alim Akhtar <alim.akhtar@...sung.com>,
	Abhilash Kesavan <a.kesavan@...sung.com>,
	Tomasz Figa <tomasz.figa@...il.com>, linux-mmc@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/5] mmc: dw_mmc: Add suspend/resume callbacks; disable
 irq during suspend

Hi Doug,

On 9 July 2013 18:31, Doug Anderson <dianders@...omium.org> wrote:
> On some platforms (like exynos5420) the dw_mmc controller may be in a
> strange state after we wake up from sleep.  Add callbacks to allow for
> dealing with these quirks.  Prevent interrupts from firing when we're
> suspended since this strange state may cause interrupts to fire.
>
> In my case I saw the WAKEUP_INT interrupt firing upon resume and
> needed to add some code to handle this.
>
> Signed-off-by: Doug Anderson <dianders@...omium.org>

Would it make sense to take advantage of the {suspend,resume}_noirq
power management callbacks to clear that WAKEUP_INT before interrupts
are re-enabled, rather than explicitly disabling and enabling the
interrupt at the suspend/resume stage?

Cheers
James
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