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

Kevin Hilman khilman at linaro.org
Thu Aug 29 17:52:49 EDT 2013

Dave Gerlach <d-gerlach at ti.com> writes:

> On 08/27/2013 03:23 PM, Kevin Hilman wrote:
>> Hi Dave,
>> Dave Gerlach <d-gerlach at ti.com> writes:
>>> On 08/19/2013 04:23 AM, Gururaja Hebbar wrote:
>>>> On 8/6/2013 11:19 PM, Dave Gerlach wrote:
>>>>> Hi,
>>>>> This is the third version of the patch series for adding basic suspend-resume
>>>>> support for AM33XX, previously submitted by Vaibhav Bedia. This patchset
>>>>> is based on 3.11-rc4 and depends on a forthcoming patchset from Suman Anna
>>>>> that adds mailbox support for the wkup_m3. The patches at [1], [2], and [3] are
>>>>> required for the pm code to properly suspend and resume.
>>>>> The PM code uses the firmware interface and expects the userspace to load
>>>>> the WKUP_M3 binary before the suspend-resume functionality is made available.
>>>>> The binary file (and the source-code for WKUP_M3) can be obtained from the
>>>>> 'next2' branch at [4]. The WKUP_M3 binary can either be loaded post bootup
>>>>> via the sysfs entry './sys/devices/ocp.2/wkup_m3.4/firmware' or it can be
>>>>> included in the kernel image as part of the build process.
>>>>> Suspend to mem is tested on am335x-bone and am335x-evm.
>>>>> More details on AM335x suspend-resume are provided within the commit logs
>>>>> for each patch.
>>>> can you share the working repo which has all these patches applied?
>>>> Thanks & Regards
>>>> Gururaja
>>> 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 didn't realize that.  I'll give it a try on my BB white.

Is there a specific version/branch of the firmware I should be using?



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