From: Alex Zeffertt <ajz@cambridgebroadband•com>
To: Li Yang <LeoLi@freescale•com>
Cc: n.balaji@gdatech•co.in, linuxppc-embedded@ozlabs•org
Subject: Re: MPC8360E USB Host Controller Driver
Date: Fri, 08 Sep 2006 09:27:02 +0100 [thread overview]
Message-ID: <45012956.2010704@cambridgebroadband.com> (raw)
In-Reply-To: <a0bc9bf80609071137o254edcc1s7bfd905c489cb604@mail.gmail.com>
Li Yang wrote:
> 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.
>
Is that what Freescale's linux driver does then?
Can it detect new USB devices in suspend state?
Regards,
Alex
next prev parent reply other threads:[~2006-09-08 8:27 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
2006-09-08 8:27 ` Alex Zeffertt [this message]
-- 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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