Re: Does SmartReflex pm patches affect USB suspend resume operations

[Kevin Hilman <khilman@deeprootsystems.com>]

Elvis Dowson <elvis.dowson@mac.com> writes:

> Hi Kevin,
>
> On May 19, 2009, at 8:12 PM, Kevin Hilman wrote:
>>>
>>
>> You're testing something that others are not: PM branch minus SR
>> patches.
>>
>> I suggest you re-add the SR patches and try the suggestions of others:
>> Roger's patches + fix your board file.
>
> I've just finished the board-overo.c modifications and will try the SR
> patches now.
>
> I try it first without Roger's modifications and see what happens, and
> then apply his modifications.
>
>> That being said, the USB driver is known to be not fully PM aware yet.
>> On my SDP, I've tested MUSB in host mode with mass storage and a USB
>> key and it can suspend/resume just fine.  However, it does not work
>> with off-mode.
>
> What is off-mode?
>

Off-mode is when most of the chip goes off during suspend/idle.  This
requires some driver support which is missing in many of the drivers since
if the chip goes off, the driver needs to save/restore state.

Off-mode is disabled by default on the PM branch, but can be enabled
by doing

   # echo 1 > /sys/power/enable_off_mode

Kevin