linux-kernel - Re: [PATCH] OMAP: HSMMC: Initialize hsmmc controller registers when resuming

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Message-ID: <9c9fda240902230426s2003d208xebeb6630c61b3bec@mail.gmail.com>
Date:	Mon, 23 Feb 2009 21:26:06 +0900
From:	Kyungmin Park <kyungmin.park@...sung.com>
To:	Adrian Hunter <ext-adrian.hunter@...ia.com>
Cc:	Kim Kyuwon <chammoru@...il.com>,
	David Brownell <david-b@...bell.net>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"drzeus-mmc@...eus.cx" <drzeus-mmc@...eus.cx>,
	김규원 <q1.kim@...sung.com>
Subject: Re: [PATCH] OMAP: HSMMC: Initialize hsmmc controller registers when 
	resuming

Hi,

On Mon, Feb 23, 2009 at 5:04 PM, Adrian Hunter
<ext-adrian.hunter@...ia.com> wrote:
> ext Kim Kyuwon wrote:
>> Hi,
>>
>> On Sat, Feb 21, 2009 at 6:11 AM, David Brownell <david-b@...bell.net> wrote:
>>> On Friday 20 February 2009, Kim Kyuwon wrote:
>>>> +static void omap_hsmmc_init(struct mmc_omap_host *host)
>>>> +{
>>>> +       u32 hctl, capa, value;
>>>> +
>>>> +       /* Only MMC1 supports 3.0V */
>>>> +       if (host->id == OMAP_MMC1_DEVID) {
>>>> +               hctl = SDVS30;
>>> Shouldn't it be remembering what voltage it was using,
>>> and then restore that, instead of always making MMC1
>>> restart at a 3.0V level?  That's pretty awkward to test
>>> unless you have a 1.8V-capable card in MMC1...
>>
>> You are somewhat right, thank you.
>> But remebering what voltage it was using doesn't feasible to me,
>> because the card can be changed while in 'Sleep' state. I should have
>> inserted a function that detect the right voltage after intializing. I
>> will resend the patch later.
>
> Doesn't it already do that? Can you explain more?
>
> Although I have not tested it, I very much doubt
> dual-voltage cards work.  That is because VMMC1_185V
> is zero, which has the side-effect of turning the
> regulator off (see arch/arm/mach-omap2/mmc-twl4030.c)

It's also to difficult to test in our H/W since it's configured only
support 3.0V.

How about to separate it two phases, first fix the mmc suspend/resume
works again, and then verify dual voltage if there are these hardware

How to you think?

Thank you,
Kyungmin Park
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