Re: USB Host Controller's Lower Power mode in Suspend State Sequence

From: bird (msnews.microsoft.com)
Date: 10/07/04 

Date: Thu, 7 Oct 2004 17:20:49 +0800

Dear David:
Thanks your answer..
I need make HC enter Suspend after the device is attached and then CPU enter
Sleep.
According your answer ,Ssjould I reset the HC after wakeup from Sleep?
But I want to keep the connection how can I do it ?

"David Liao (MS)" <davli@online.microsoft.com> ¦b¶l¥ó
news:%23tDxEw%23qEHA.2636@TK2MSFTNGP09.phx.gbl ¤¤¼¶¼g...
> I don't think this is going to work because after removing Clock from USB
> HC, you need reset USB HC after reableing clock. THis mean you need reset
> USB HC driver (ohci2.dll).
> You may want to try this to save the power.
> [HKEY_LOCAL_MACHINE\Drivers\BuiltIn\OHCI]
> "InterfaceType"=dword:0 ; Internal
> "Prefix"="HCD"
> "Dll"="ohci2.dll"
> "Index"=dword:1
> "Order"=dword:1
> "Irq"=dword:3
> "SysIntr"=dword:11 ; (SYSINTR_FIRMWARE+1)
> "MemBase"=dword:4C000000
> "MemLen"=dword:1000
> "UseExistingSettings"=dword:0
> ;;<----- add following line make HC suspend when there is no device
> attached.
> "HcdCapability"=dword:4 ;HCD_SUSPEND_ON_REQUEST
>
>
> David Liao
>
> "bird" <msnews.microsoft.com> wrote in message
> news:uZBVpItqEHA.3896@TK2MSFTNGP15.phx.gbl...
> > Dear All:
> > I implement the function that forUSB Host Controller enter Lower Power
> > mode
> > in Suspend State when the CPU is entered Sleep,I following the sequence
> > descript in the PXA27X spec.(20.7.4.2)
> > But how can I return to active that issued when the CPU wakeup from
Sleep
> > ?!
> > When I start the clock the HC always stay in reset state,the Spec only
> > said S/W wait the usbportresume interrupt but there is no any interrupt
> > will
> > be issued...
> >
> >
> >
>
>

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