Re: [PATCH] usb: musb: fix enumeration after resume

Tony Lindgren
2018-02-06T18:47:31Z

* Andreas Kemnade <andreas@kemnade.info> [180127 08:34]:
> On dm3730 there are enumeration problems after resume.
> Investigation led to the cause that the MUSB_POWER_SOFTCONN
> bit is not set. If it was set before suspend (because it
> was enabled via musb_pullup()), it is set in
> musb_restore_context() so the pullup is enabled. But then
> musb_start() is called which overwrites MUSB_POWER and
> therefore disables MUSB_POWER_SOFTCONN, so no pullup is
> enabled and the device is not enumerated.

I just gave this patch a quick try and things seem to behave
for me from PM point of view:

Tested-by: Tony Lindgren <tony@atomide.com>

Unrelated to this patch, I also noticed that we now somehow
higher idle power consumption initially when musb modules are
loaded. It used to idle after that but now to get things to
idle I had to plug and unplug a USB device once to the musb
port.

Regards,

Tony