Messages in this thread | | | Date | Tue, 14 Jul 2009 23:17:34 +0800 | From | Eric Miao <> | Subject | Re: da9030: ldo11 ignores disable |
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Eric Miao wrote: > 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.
Hi Jonathan,
Here's a hint, check register 0x1b - which looks suspicious to me to have some side effects to LDO11.
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