linux-kernel - Re: da9030: ldo11 ignores disable

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Message-ID: <4A44A026.3050207@cam.ac.uk>
Date:	Fri, 26 Jun 2009 10:17:10 +0000
From:	Jonathan Cameron <jic23@....ac.uk>
To:	Liam Girdwood <lrg@...mlogic.co.uk>
CC:	LKML <linux-kernel@...r.kernel.org>,
	Mark Brown <broonie@...ena.org.uk>, mike.rapoport@...il.com,
	eric miao <eric.y.miao@...il.com>
Subject: Re: da9030: ldo11 ignores disable

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.

Thanks,

Jonathan
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