From: "Li Yang" <LeoLi@freescale.com>
To: "Alex Zeffertt" <ajz@cambridgebroadband.com>
Cc: n.balaji@gdatech.co.in, linuxppc-embedded@ozlabs.org
Subject: Re: MPC8360E USB Host Controller Driver
Date: Fri, 8 Sep 2006 02:37:30 +0800 [thread overview]
Message-ID: <a0bc9bf80609071137o254edcc1s7bfd905c489cb604@mail.gmail.com> (raw)
In-Reply-To: <450029E3.2030303@cambridgebroadband.com>
On 9/7/06, Alex Zeffertt <ajz@cambridgebroadband.com> wrote:
> Li Yang-r58472 wrote:
> >> i have a MPC8347E running with the Freescale E(F)HCI driver
> >> and Kernel 2.6.17 (Freescale LTIB).
> >>
> >> Because of this mail, i checked, if there are any periodical
> >> interrupts, without real USB payload.
> >>
> >> The result is: NO
> >>
> >> If i attach a USB-mouse, i get 5 interrupts.
> >> If i remove it again, 1 additional.
> >>
> >> Nothing else, silence !
> >>
> >> USB works well with USB 1.1 and 2.0 devices (This was not the
> >> case with earlier Kernels, e.g. 2.6.13, because for the
> >> switching between 1.1 and 2.0 you need a transaction
> >> translator driver).
> >
> > MPC834x USB is very different from the USB of CPM/QE. It is an
> > integrated EHCI controller.
> >
>
>
> So, the question is still open, does the QuiccEngine HCI (a.k.a. FHCI)
> generate loading on the PPC core when there is no traffic on the USB?
Yes, but no. If the bus is idle for some time, you can put the bus
into suspend state. Then there will be no extra load to the core.
- Leo
next prev parent reply other threads:[~2006-09-07 18:37 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-09-07 11:12 MPC8360E USB Host Controller Driver Claus Gindhart
2006-09-07 11:20 ` Li Yang-r58472
2006-09-07 14:17 ` Alex Zeffertt
2006-09-07 18:37 ` Li Yang [this message]
2006-09-08 8:27 ` Alex Zeffertt
-- strict thread matches above, loose matches on Subject: below --
2006-09-09 1:09 Dan Gora
2006-09-11 9:08 ` Alex Zeffertt
2006-09-07 8:03 n.balaji
2006-09-07 8:25 ` Li Yang-r58472
2006-09-07 10:58 ` Alex Zeffertt
2006-09-07 11:19 ` Li Yang-r58472
2006-09-07 11:24 ` Laurent Pinchart
2006-09-07 12:07 ` Li Yang
2006-09-08 3:27 ` Li Yang-r58472
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