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

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Message-ID: <49A258A2.2020408@nokia.com>
Date:	Mon, 23 Feb 2009 10:04:50 +0200
From:	Adrian Hunter <ext-adrian.hunter@...ia.com>
To:	Kim Kyuwon <chammoru@...il.com>
CC:	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>,
	박경민 <kyungmin.park@...sung.com>
Subject: Re: [PATCH] OMAP: HSMMC: Initialize hsmmc controller registers when
 	resuming

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)
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