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

[Dave Gerlach]

On 08/29/2013 06:02 PM, Kevin Hilman wrote:
> 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.
>
> Kevin
>

Kevin,
Thanks for taking the time to try this out, it does seem there are a few 
kinks with BeagleBone Black but we'll get those worked out.

Regards,
Dave