linux-kernel - Re: da9030: ldo11 ignores disable

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Message-ID: <4A4DB73A.9050803@gmail.com>
Date:	Fri, 03 Jul 2009 15:46:02 +0800
From:	Eric Miao <eric.y.miao@...il.com>
To:	Jonathan Cameron <jic23@....ac.uk>
CC:	Liam Girdwood <lrg@...mlogic.co.uk>,
	LKML <linux-kernel@...r.kernel.org>,
	Mark Brown <broonie@...ena.org.uk>, mike.rapoport@...il.com,
	Paul Shen <bshen9@...vell.com>,
	Haojian Zhuang <hzhuang1@...vell.com>
Subject: Re: da9030: ldo11 ignores disable

Jonathan Cameron wrote:
> Liam Girdwood wrote:
>> On Thu, 2009-06-25 at 15:39 +0000, Jonathan Cameron wrote:
>>> Hi All,
>>>
>>> Whilst testing a regulator machine config I've run into a weird issue.
>>>
>>> The preliminary data sheet I have suggests that there are two enable
>>> registers
>>> for ldo11 but neither rctl22 or rctl11 seems to have any effect (on
>>> their own
>>> or both cleared together). I can change the voltage just fine, but not
>>> actually turn it off.
>>>
>>> Anyone come across this problem or have any idea what is going on?
>> I've come across something similar in the past with two enable bits
>> causing I2C register cache coherency issues. The cache bits became out
>> of sync with reality and stopped some I2C writes happening.
> Don't thing that could happen here.
>> Another option is that your hardware config doesn't allow ldo11 to be
>> disabled ?
> Other than the obvious possibility that the hardware has a bug, I can't
> seem to find a reason why this shouldn't work.
> 

I didn't meet this problem, Haojian & Paul, ever had this problem before?
Or try lookup the Errata for the Arava chip.
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