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From: "mahendra varman" <>
Subject: usb detecting only high speed devices only - not detecting low speed devices
Date: Tue, 26 Feb 2008 19:13:26 +0530	[thread overview]
Message-ID: <> (raw)

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 , and also 2.6.23  , 2.6.24 ..
In all these iam facing the above issues

Please shed some light to solve the issue


Below are some observations
/ # cat /proc/interrupts
 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

/ # 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
 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:[~2008-02-26 13:43 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-26 13:43 mahendra varman [this message]
2008-02-27  0:05 ` Andrew Morton
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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