Hi,

On Wed, Aug 12, 2015 at 08:09:27AM +1000, NeilBrown wrote:

On Tue, 11 Aug 2015 23:34:17 +0200 Alexander Holler
[off-list ref] wrote:

quoted

Am 11.08.2015 um 10:29 schrieb NeilBrown:

quoted

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.

quoted

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.

It'll take me a while to be able to look at this. I don't have any
platform with TWL4030 (IIRC, AM335x uses tps65218 instead). Besides, I
have a slightly bigger problem to look at (MUSB + some hubs + CP2108
fails sometimes).

If I get some time, I'll try to have a look, but it might take a few
weeks.

cheers

-- 
balbi