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

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Date:	Mon, 23 Feb 2009 10:30:24 -0800
From:	David Brownell <david-b@...bell.net>
To:	Kyungmin Park <kyungmin.park@...sung.com>,
	Adrian Hunter <ext-adrian.hunter@...ia.com>
Cc:	Kim Kyuwon <chammoru@...il.com>,
	"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

On Monday 23 February 2009, Kyungmin Park wrote:
> > 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)

Right, looks like a longstanding bug in that glue.
So IMO, no rush to fix for 2.6.29-rc ...


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

Easily tested with a Beagle or SDP though, if you
have a 1.8V or dual-voltage card (maybe RS-MMC, as
for an N770 tablet).


> 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

Well, two patches for sure; I don't know that the order
will matter.  I just sent a patch fixing that code in
the current OMAP git tree, which has some fixes that are
scheduled to merge for 2.6.30-rc.

- Dave

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