[PATCH v3 2/5] ARM: pm: add generic CPU suspend/resume support

Jean Pihet jean.pihet at newoldbits.com
Mon Feb 28 13:21:59 EST 2011

On Sat, Feb 12, 2011 at 4:09 PM, Santosh Shilimkar
<santosh.shilimkar at ti.com> wrote:
>> -----Original Message-----
>> From: Russell King - ARM Linux [mailto:linux at arm.linux.org.uk]
>> Sent: Saturday, February 12, 2011 8:20 PM
>> To: Santosh Shilimkar
>> Cc: Colin Cross; Kukjin Kim; saeed bishara; linux-arm-
>> kernel at lists.infradead.org
>> Subject: Re: [PATCH v3 2/5] ARM: pm: add generic CPU suspend/resume
>> support
>> On Fri, Feb 11, 2011 at 05:37:04PM +0530, Santosh Shilimkar wrote:
>> > There is a Monitor secure API, needs to be called from non-secure
>> > software to set this diagnostic registers in resume path.
>> It would be an idea to get the OMAP sleep code up to date so that I
>> can
>> look at OMAPs requirements for this to be useful.
>> As the current code stands, I don't see any reason why the sleep34xx
>> code
>> can't use this infrastructure, but I'm loathed to start modifying
>> that if there's outstanding code changes in that area.
> Yep. There are few issues out there with sleep34xx code.
>        - Secure APIs
>        - Current code needs to be cleaned up to remove
>        unwanted registers save restore
>        - Some part of the code on OMAP3 must be run from
>        SRAM. It can't run from DDR
This is not the highest priority for now, I will have to come back
later on this.

>        - AUXCTLR, Diagnostic registers aren't accessible
>        in secure mode.
>        - L2 cache needs to be handled with secure APIs.
>        - Code sequence needs to handle errata's handling
>        which accesses OMAP PM registers.
Also there is some on-going work to support Thumb-2, adding Dave.

> Few of the above are getting addressed for this merge window.
> So my plan was to take a look at generic suspend after the
> merge window. By that time your generic stuff and omap
> cleanup would have got merged hopefully.

> Regards,
> Santosh


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