[PATCHv3 0/9] ARM: OMAP2+: AM33XX: Add suspend-resume support

Kevin Hilman khilman at linaro.org
Thu Aug 29 19:02:26 EDT 2013

On Thu, Aug 29, 2013 at 3:43 PM, Russ Dill <Russ.Dill at ti.com> wrote:
> On Thu, Aug 29, 2013 at 3:20 PM, Kevin Hilman <khilman at linaro.org> wrote:
>> Dave Gerlach <d-gerlach at ti.com> writes:
>> [...]
>>>>> The working repo for this version of the patch series can be found here:
>>>>> git://github.com/dgerlach/linux-pm.git am335x-3.11rc4-suspend-resume
>>>> I tried this branch on my beaglebone black, and it's not fully resuming.
>>>> Suspend seems to be working (power draw goes from ~1W to ~130mW) and
>>>> pressing a key on the UART seems to be waking up the SoC (power draw
>>>> goes to ~600mW) but I don't ever get the console back.
>>>> Is there a specific version of the firmware I should be using?
>>>> Kevin
>>> Kevin, I agree there does seem to be some issues with Beaglebone
>>> black. I can confirm it works on BeagleBone White and the large am335
>>> EVM, I am working on pinpointing the issue on beaglebone black, seems
>>> that support isn't quite there yet.
>> OK, I tried the above branch on my BB white, using prebuilt firmware
>> from the next3 branch of the am33x-cm3 repo and it's suspending/resuming
>> fine.  Thanks for the pointer.
>> FYI, measuring at the 5V supply, it goes from ~1.6W at idle down to
>> ~700mW in suspend.  The black goes from ~1W down to an impressive 130mW
>> but of course, it doesn't wake up so maybe it's not that impressive. ;)
> Just a reminder, the next3 firmware is built to be compatible with
> older kernel revisions whereas the next2 firmware is not. In order for
> that compatibility to work, the CMD_ID_DS0 that mainline uses should
> change from 0x3 to 0x4

Thanks, i switched to the next2 firmware since I'm only using current kernels.


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