Re: EHCI and MUSB do not discover devices without CONFIG_PM

[Ladislav Michl <ladis-6z/3iImG2C8G8FEW9MqTrA@public.gmane.org>]

On Tue, Nov 28, 2017 at 02:59:32PM -0500, Alan Stern wrote:
> On Tue, 28 Nov 2017, Ladislav Michl wrote:
> 
> > On Tue, Nov 28, 2017 at 01:09:45PM -0500, Alan Stern wrote:
> > > The EHCI debugging files require CONFIG_DYNAMIC_DEBUG to be enabled.  
> > > Oddly enough, the OHCI debugging files do not have the same 
> > > requirement.  I don't know the reason for this difference.
> > 
> > I see, thanks for suggestion.
> > 
> > USB cable unplugged:
> > $ cat /sys/kernel/debug/usb/ehci/48064800.ehci/registers 
> > bus platform, device 48064800.ehci
> > EHCI Host Controller
> > EHCI 1.00, rh state running
> > structural params 0x00001313
> > capability params 0x00000016
> > status 0000
> > command 0010005 (park)=0 ithresh=1 period=512 RUN
> > intrenable 37 IAA FATAL PCD ERR INT
> > uframe 0000
> > port:1 status 001000 0  ACK POWER sig=se0
> > port:2 status 001000 0  ACK POWER sig=se0
> > port:3 status 001000 0  ACK POWER sig=se0
> > irq normal 0 err 0 iaa 0 (lost 0)
> > complete 0 unlink 0
> > 
> > Plugged:
> > $ cat /sys/kernel/debug/usb/ehci/48064800.ehci/registers 
> > bus platform, device 48064800.ehci
> > EHCI Host Controller
> > EHCI 1.00, rh state running
> > structural params 0x00001313
> > capability params 0x00000016
> > status 0000
> > command 0010005 (park)=0 ithresh=1 period=512 RUN
> > intrenable 37 IAA FATAL PCD ERR INT
> > uframe 0000
> > port:1 status 001000 0  ACK POWER sig=se0
> > port:2 status 001000 0  ACK POWER sig=se0
> > port:3 status 001000 0  ACK POWER sig=se0
> > irq normal 0 err 0 iaa 0 (lost 0)
> > complete 0 unlink 0
> 
> So no change at all.  In particular, no change to the port statuses.  
> This suggests the hardware isn't configured properly; maybe a phy isn't
> detecting the new connection.
> 
> I don't know anything about the phy drivers, however.  You should bring 
> this to the attention of the maintainer for whichever phy is on your 
> board.

Thanks for suggestion, there's USB3326 ULPI PHY with nEN_USB_PWR connected
to TWL4030 LEDA output.

> By the way, the behavior when you plug in a device with CONFIG_PM=n
> should be just about the same as the behavior with CONFIG_PM=y when you
> plug in a _second_ device.  Have you tried doing that, say with two 
> flash drives?  (I'm assuming your board has more than one EHCI port 
> available.)

Unfortunately there's only one EHCI port, however your suggestions are
enough to start debugging.

Thank you,
	ladis
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