Re: [PATCH v3 2/5] mmc: dw_mmc: Add suspend_noirq/resume_noirqcallbacks for dw_mmc-pltfm

From: Doug Anderson
Date: Tue Aug 06 2013 - 17:32:29 EST

Seungwon Jeon,

On Mon, Jul 15, 2013 at 5:09 AM, Seungwon Jeon <tgih.jun@xxxxxxxxxxx> wrote:
> On Thu, July 11, 2013, Doug Anderson wrote:
>> On some devices (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. We use the "_noirq" versions of the
>> callbacks since in the case of exynos5420 the strange state caused
>> interrupts to fire so we need to deal with it while interrupts are
>> still off.
>> At the moment this support is only added to dw_mmc-pltfm which calls
>> straight to the callback, since nobody but exynos needs it. We can
>> add some levels of indirection (a call into the generic dw_mmc code)
>> when someone finds a need.
> I think It would be better to add _noirq only to dw_mmc-exynos.
> That is we can add dev_pm_ops for dw_mmc-exynos's own.
> As you recognize, there is no common routine which is not introduced for dw_mmc xxx_noirq now.
> I feel like it is for handling quirk.
> If we meet use case for that in some day, it could be added commonly.
> How do you think?
> Thanks,
> Seungwon Jeon

Sorry for the long delay in responding.

I originally didn't do what you proposed since dw_mmc-exynos uses the
dw_mci_pltfm_pmops directly. ...but I agree that it is cleaner, so
I've switched the code to do as you say. New patch coming shortly.
Thank you for your review.

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