Re: pxa270 - USB low speed devices - Maybe the USB cable is bad?

On Mon, 26 Mar 2007, David Brownell wrote:

> On Monday 26 March 2007 2:11 am, Girish wrote:
> 
> > pxa27x-ohci: created debug files
> > pxa27x-ohci pxa27x-ohci: resetting from state 'reset', control = 0x0
> > pxa27x-ohci pxa27x-ohci: OHCI controller state
> > pxa27x-ohci pxa27x-ohci: OHCI 1.0, NO legacy support registers
> > pxa27x-ohci pxa27x-ohci: control 0x083 HCFS=operational CBSR=3
> > pxa27x-ohci pxa27x-ohci: cmdstatus 0x00000 SOC=0
> > pxa27x-ohci pxa27x-ohci: intrstatus 0x00000004 SF
> > pxa27x-ohci pxa27x-ohci: intrenable 0x8000005a MIE RHSC UE RD WDH
> > pxa27x-ohci pxa27x-ohci: hcca frame #0009
> > pxa27x-ohci pxa27x-ohci: roothub.a 04001202 POTPGT=4 NOCP NPS NDP=2(2)
> > pxa27x-ohci pxa27x-ohci: roothub.b 00000000 PPCM=0000 DR=0000
> > pxa27x-ohci pxa27x-ohci: roothub.status 00008000 DRWE
> > pxa27x-ohci pxa27x-ohci: roothub.portstatus [0] 0x00010301 CSC LSDA PPS CCS
> 
> Notice those bits ...
> 
> > pxa27x-ohci pxa27x-ohci: roothub.portstatus [1] 0x00000100 PPS
> > usb usb1: default language 0x0409
> > usb usb1: new device strings: Mfr=3, Product=2, SerialNumber=1
> > usb usb1: Product: PXA27x OHCI
> > usb usb1: Manufacturer: Linux 2.6.20 ohci_hcd
> > usb usb1: SerialNumber: pxa27x
> > ...
> > pxa27x-ohci pxa27x-ohci: GetStatus roothub.portstatus [0] = 0x00010301 CSC LSDA PPS CCS
> > hub 1-0:1.0: port 1, status 0301, change 0001, 1.5 Mb/s
> > bound device 'pxa27x-ohci' to driver 'pxa27x-ohci'
> > platform: Bound Device pxa27x-ohci to Driver pxa27x-ohci
> > hub 1-0:1.0: debounce: port 1: total 100ms stable 100ms status 0x301
> > pxa27x-ohci pxa27x-ohci: GetStatus roothub.portstatus [0] = 0x00120301 PRSC PESC LSDA PPS CCS
> 
> ... versus those bits.
> 
>  * CSC (connect status change, the 0x0001) cleared, khubd does this
> 
>  * PRSC (port reset status change) set ... but PRS (port reset status)
>    was never set, that looks a trifle odd (but I'd have to check specs)

khubd also sets PRS, after debouncing.

> 
>  * PESC (port enable status change) set ... but PES (port enable status)
>    is NOT set, and that seems quite wrong.

Agreed, this one is what causes the problem.  After the reset finishes the 
port isn't enabled.

Alan Stern


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