[Letux-kernel] gadget after suspend

[Andreas Kemnade]

On Thu, 25 Jan 2018 20:01:45 +0100
Andreas Kemnade <andreas at kemnade.info> wrote:

> Hmm, musb talking with twl is hidden. turning on DEBUG in musb_core.c
> and phy-twl4030.c did not show up anything interesting.
> 
> But now I found out something interesting:
> Setting MUSB_POWER_SOFTCONN and MUSB_DEVCTL_SESSION via devmem2 seems
> to enable gadget. MUSB seems to know that there is vbus.
> 
> Normally these things should be reset in
> musb_restore_context()
> if they are set before suspend in the call to
> musb_save_context().
> 
After resume, musb_restore_context() restores the values. That seem to
work. 
But then there is a call to musb_start() after that which resets
MUSB_POWER, so it disables MUSB_POWER_SOFTCONN which disables the
pullup resistors -> no gadget...

It was introduced in 6fc6f4b87cb32fcd0bf5e5bce434301958a3b624.

Regards,
Andreas