Hi Sekhar,
On Thu, Feb 14, 2013 at 12:29:11, Nori, Sekhar wrote:
> On 2/14/2013 10:46 AM, Vishwanathrao Badarkhe, Manish wrote:
> > Hi Sekhar,
> >
> > On Thu, Feb 14, 2013 at 09:48:59, Nori, Sekhar wrote:
> >> Manish,
> >>
> >> On 1/31/2013 2:56 PM, Vishwanathrao Badarkhe, Manish wrote:
> >>> As per OMAP-L138 TRM, Software must poll for SLEEPCOMPLETE bit until
> >>> it is set to 1 before clearing SLEEPENABLE bit in DEEPSLEEP register
> >>> in resume routine.
> >>> Modifications are as per datasheet:
> >>> http://www.ti.com/lit/ug/spruh77a/spruh77a.pdf
> >>> See sections 10.10.2.2 and 11.5.21 for more detailed explanation.
> >>
> >> Polling for SLEEPCOMPLETE is not required in RTC controlled wake-up which
> >> is the mode currently supported (see section 10.10.2.1 of the TRM).
> >> Polling for SLEEPCOMPLETE is required for external controlled wake-up
> >> which to my knowledge has never been tested. If you have tested this with
> >> external controlled wakep-up, then I can consider this patch.
> >> Else, I would like to take it only after externally controlled wake-up is
> >> fully tested/supported instead of taking bits and pieces.
> >
> > Yes, for RTC controlled wakeup, this polling is not required as per section
> > 10.10.2.1.
> > But if we see in section 10.10.2.2 (Exiting Deep Sleep Mode) step 2,
> > When sleep count completes SLEEPCOMPLETE bit gets sets in DEEPSLEEP
> > register till that it's not safe to release clock to devices. So If we
> > don’t poll for SLEEPCOMPLETE, this delay will not come into picture
> > which we actually set while entering deep sleep in case of RTC controlled
> > wakeup (Section 10.10.2.1 step 9).
> > Please let me know, whether these understanding is correct?
>
> The delay is coming from hardware. Till SLEEPCOUNT completes, the clock to
> device is not provided. There is no need to poll for SLEEPCOMPLETE and indeed
> 10.10.2.2 does not ask for this bit to be polled.
Thanks for your explanation.
Ok, I will test this patch with external controlled wakeup and update you.
Regards,
Manish Badarkhe
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