[Letux-kernel] power management problems in ehci-omap

Andreas Kemnade andreas at kemnade.info
Sun Feb 4 09:38:40 CET 2018


On Sun, 4 Feb 2018 00:10:50 +0100
Michael Nazzareno Trimarchi <michael at amarulasolutions.com> wrote:

> Hi
> 
> On Sun, Feb 4, 2018 at 12:03 AM, Andreas Kemnade <andreas at kemnade.info> wrote:
> > Hi,
> >
> > I booted a 4.15 kernel without udev and loaded modules piece by piece to analyze
> > pm problems. modprobe ehci-omap increases current by around 35mA and
> > also rmmod ehci-omap does not let it go down at all.
> >
> > I expect that removing hardware does the same thing
nonsense sentence from me, was to tired. I would expect that removing the modules
properly powers down the device.
> >
> > Also suspend current increases by around 15mA if that module is loaded.
> > I tested with having everything disabled which is attached to that usb bus.
> >  
> 
> Do you have an LTE connected to the usb?
> 
Yes, there is a UMTS modem attached, but it was off during the tests.
It did not enumerate on the modem.

> Michael
> 
> > System was
> > GTA04A5 (with dm3730 processor and usb3322 phy)
> >
> > I know it has worked once, but I do not remember the version.
> >
> > The kernel config used can be found here:
> > http://misc.andi.de1.cc/config-4.15.gz
> >
Regards,
Andreas


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