Re: [PATCH 4.1 099/267] phy: twl4030-usb: remove incorrect pm_runtime_get_sync() in probe function.

From: NeilBrown
Date: Tue Aug 11 2015 - 18:09:49 EST

On Tue, 11 Aug 2015 23:34:17 +0200 Alexander Holler
<holler@xxxxxxxxxxxxx> wrote:

> Am 11.08.2015 um 10:29 schrieb NeilBrown:
> > With the current mainline code (plus my twl4030 charger enhancements,
> > which are not deeply relevant), the refcount does go to zero when
> > nothing is plugged in, and goes to 2 when a regular USB cable is
> > plugged in.
> Also I think it's just a little miswording (or extended typo), I'm not
> using a regular USB cable, but an OTG cable when using the host mode of
> the musb on the Beagleboard. Just to avoid confusion. Or do you talk
> about the client mode when it goes to 2?

With an OTG cable, the usage_count would probably got to '1' because
the charger wouldn't be interested.

However the important point is that the usage_count goes to zero when
no cable is plugged in.

> Besides that, I'm sorry to not be of further help. My deeper knowledge
> about the musb sources in the kernel and u-boot (and the HW in
> question), has gone lost and I've currently no real reason to refresh
> that. ;)

Just reporting the problem is sometimes 90% for the bug fixed.
I'm confident I know what is happening. What isn't clear is how best
to fix it without breaking something else... I suspect Felipe can help
with that.

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