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From: Andrew Morton <akpm@linux-foundation.org>
To: "mahendra varman" <mahendravarman15@gmail.com>
Cc: linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org
Subject: Re: usb detecting only high speed devices only - not detecting low speed devices
Date: Tue, 26 Feb 2008 16:05:38 -0800	[thread overview]
Message-ID: <20080226160538.086a681d.akpm@linux-foundation.org> (raw)
In-Reply-To: <4ac2955e0802260543n7d7e5d81nb590d2bc10648269@mail.gmail.com>


(cc linux-usb)

On Tue, 26 Feb 2008 19:13:26 +0530 "mahendra varman" <mahendravarman15@gmail.com> wrote:

> Hello all
> 
> In a project Iam using 7448 powerpc processor . In that board iam
> using ISP 1562 philips PCI based usb controller.
> The problem iam facing is in Linux level the usb ports are detecting
> only ehci high speed devices(flash mem stick)
>  But it is not detecting low speed devices(mouse,keyboard) and
> reporting Unlink no irq..Controller probably using wrong irq.
> 
> As per ISP 1562 the same interrupt is routed to 3 functions inside one
> controller( 2 ohci and 1 ehci)
>  The interrupt works for the ehci device ( flash mem stick)
> The same interrupt is assigned for ohci function. I removed the flash
> stick and inserted an ohci device(mouse)
> but iam getting unlink after no IRQ
> 
> How the interrupt works for ehci and the same interrupt not working for ohci ?
> 
> I can ensure that the IRQ assignment has been done properly as well as
> I have enabled necesary configs in menuconfig for ehci and ohci
> 
> I tried linux version 2.6.12 , 2.6.16.60 and also 2.6.23  , 2.6.24 ..
> In all these iam facing the above issues
> 
> Please shed some light to solve the issue
> 
> Thanks
> 
> 
> Below are some observations
>  -----------------------------------------------
> BEFORE INSERTING MOUSE
> / # cat /proc/interrupts
>            CPU0
>  12:         99  tsi108_pic Level     serial
>  36:          1  tsi108_PCI_int Level     VMEBus (Tsi148)
>   39:          0  tsi108_PCI_int Level     ehci_hcd:usb1,
> ohci_hcd:usb2, ohci_hcd :usb3
> 
> AFTER INSERTING MOUSE
> / # usb 3-1: new low speed USB device using ohci_hcd and address 2
> ohci_hcd 0000:01:04.1: Unlink after no-IRQ?  Controller is probably
> using the wrong IRQ.
> 
> / # cat /proc/interrupts
>            CPU0
>  12:        130  tsi108_pic Level     serial
>  36:          1  tsi108_PCI_int Level     VMEBus (Tsi148)
>  39:          2  tsi108_PCI_int Level     ehci_hcd:usb1,
> ohci_hcd:usb2, ohci_hcd:usb3


  reply	other threads:[~2008-02-27  0:07 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-26 13:43 mahendra varman
2008-02-27  0:05 ` Andrew Morton [this message]
2008-02-27  2:17   ` David Brownell
2008-03-03  9:31     ` mahendra varman
2008-03-03 19:07       ` David Brownell

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