linux-kernel - Re: [PATCH] mmc: dw_mmc: Don't disable vmmc if keeping power in suspend

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Message-ID: <CAD=FV=U69UONapHhy+LQ0cNe+G5SWmowvVnAWxcEP+CN_HOXkg@mail.gmail.com>
Date:	Mon, 12 Aug 2013 10:31:32 -0700
From:	Doug Anderson <dianders@...gle.com>
To:	Seungwon Jeon <tgih.jun@...sung.com>
Cc:	Derek Basehore <dbasehore@...omium.org>,
	Chris Ball <cjb@...top.org>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <rob.herring@...xeda.com>,
	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	devicetree@...r.kernel.org
Subject: Re: [PATCH] mmc: dw_mmc: Don't disable vmmc if keeping power in suspend

Seungwon and Derek,

On Mon, Aug 12, 2013 at 3:33 AM, Seungwon Jeon <tgih.jun@...sung.com> wrote:
> On Wed, August 07, 2013, Derek Basehore
>> If we keep power for suspend on a host for dw_mmc, don't disable vmmc-supply
>> regulator when suspending the host.
>
> I have a trivial comment.
> It would be better to add some macro for checking MMC_PM_KEEP_POWER.
> And I just wonder how the problem is silent. Origin code has stood up somewhat long.
> Did you see?
>
> Acked-by: Seungwon Jeon <tgih.jun@...sung.com>
>
> Thanks,
> Seungwon Jeon
>
>>
>> Signed-off-by: Derek Basehore <dbasehore@...omium.org>
>> Reviewed-by: Doug Anderson <dianders@...omium.org>
>> ---
>>  drivers/mmc/host/dw_mmc.c | 4 ++--
>>  1 file changed, 2 insertions(+), 2 deletions(-)

Though I reviewed this originally, I'd actually propose not landing it.

I've spent more time with the regulator code in dw_mmc and currently
believe that the regulators should be enabled / disabled in
MMC_POWER_UP / MMC_POWER_OFF.  When we do that then the mmc core will
handle MMC_PM_KEEP_POWER.  You can see my current thoughts on this in
<https://gerrit.chromium.org/gerrit/#/c/65263/>.  I will try to post
that upstream before too long, but feel free to let me know any
comments.

-Doug
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