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

[Russ Dill]

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