linux-kernel - Re: Nokia N900: u-SD card in v4.2+

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Message-Id: <201601092344.44641@pali>
Date:	Sat, 9 Jan 2016 23:44:44 +0100
From:	Pali Rohár <pali.rohar@...il.com>
To:	Pavel Machek <pavel@....cz>
Cc:	Kishon Vijay Abraham I <kishon@...com>, sre@...ian.org,
	sre@...g0.de, kernel list <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel" <linux-arm-kernel@...ts.infradead.org>,
	linux-omap@...r.kernel.org, tony@...mide.com, khilman@...nel.org,
	aaro.koskinen@....fi, ivo.g.dimitrov.75@...il.com,
	patrikbachan@...il.com
Subject: Re: Nokia N900: u-SD card in v4.2+

On Thursday 07 January 2016 12:34:09 Pavel Machek wrote:
> Hi!
> 
> > On Thursday 07 January 2016 02:16 AM, Pavel Machek wrote:
> > > Hi!
> > > 
> > > In v4.1, both internal MMC and u-SD cards work ok.
> > > 
> > > In v4.2, only the internal MMC is detected. In v4.3, not even
> > > internal MMC works. In v4.4, only the internal MMC is detected.
> > > 
> > > Does it work for you? Any patches?
> > 
> > I don't have Nokia N900 to check this, but can you share your
> > config and kernel logs? Check if CONFIG_REGULATOR_PBIAS is present
> > in your config. CONFIG_REGULATOR_PBIAS is now mandatory for all
> > omap3+ SoCs to work.
> 
> I enabled CONFIG_REGULATOR_PBIAS and both MMCs now work.
> 
> I wonder if we should add some selects, so that users updating from
> old kernels don't break their system?

Please add these selects. I had CONFIG_REGULATOR_PBIAS disabled too, 
because I just updated defconfig from older kernel version.

-- 
Pali Rohár
pali.rohar@...il.com

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