Re: [PATCH 2/3] MMC: OMAP: HSMMC: add runtime pm support

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On Wed, Jun 29, 2011 at 12:11 AM, Paul Walmsley <paul@xxxxxxxxx> wrote:
> On Tue, 28 Jun 2011, T Krishnamoorthy, Balaji wrote:
>
>> On Tue, Jun 28, 2011 at 10:52 PM, Paul Walmsley <paul@xxxxxxxxx> wrote:
>> >
>> > On Wed, 22 Jun 2011, Balaji T K wrote:
>> >
>> >> Use runtime autosuspend APIs to enable auto suspend delay
>> >
>> > Does this really need to use runtime autosuspend?  Seems to me that since
>> > PM runtime is just controlling the MMC IP blocks and not the regulators in
>> > this instance, this could simply use pm_runtime_put*() and just avoid the
>> > extra power wastage and complexity involved in autosuspend.
>>
>> I have seen some instabilities if delay is very less, on some production boards.
>
> Could you be more specific?  What type of instabilities did you see?

There have been some experiments on our customer programs to reduce this
value to a few ms and infrequent crashes were observed (stress testing
for several hours) while
trying to access the controller registers.

>
>> The previous implementation used 100ms delay before disabling the clocks.
>> Is there any specific issue I should be aware of, for using _autosuspend ?
>
>
> - Paul
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