linux-kernel - Re: [PATCH v2 2/5] mmc: dw_mmc: Add suspend_noirq/resume_noirq callbacks for dw

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Date:	Wed, 10 Jul 2013 09:37:26 +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>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/5] mmc: dw_mmc: Add suspend_noirq/resume_noirq callbacks
 for dw_mmc-pltfm

Hi Doug,

On 10/07/13 00:19, 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.
> 
> Signed-off-by: Doug Anderson <dianders@...omium.org>

Reviewed-by: James Hogan <james.hogan@...tec.com>

<snip>

>  
> -SIMPLE_DEV_PM_OPS(dw_mci_pltfm_pmops, dw_mci_pltfm_suspend, dw_mci_pltfm_resume);
> +const struct dev_pm_ops dw_mci_pltfm_pmops = {
> +	SET_SYSTEM_SLEEP_PM_OPS(dw_mci_pltfm_suspend, dw_mci_pltfm_resume)
> +	.suspend_noirq = dw_mci_pltfm_suspend_noirq,
> +	.resume_noirq = dw_mci_pltfm_resume_noirq,
> +};

Does Exynos support hibernation? I see that SET_SYSTEM_SLEEP_PM_OPS sets
freeze, thaw, poweroff, and restore callbacks too. You may not need the
hibernation specific _noirq callbacks though in which case it's probably
fine as it is.

Cheers
James

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