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Message-Id: <200802261817.02830.david-b@pacbell.net> Date: Tue, 26 Feb 2008 18:17:02 -0800 From: David Brownell <david-b@...bell.net> To: Andrew Morton <akpm@...ux-foundation.org>, "mahendra varman" <mahendravarman15@...il.com> Cc: linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org Subject: Re: usb detecting only high speed devices only - not detecting low speed devices On Tuesday 26 February 2008, Andrew Morton wrote: > > 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. My diagnosis hasn't changed since last time he asked this question: it's related to IRQ handling, outside the scope of USB. If USB were getting the OHCI interrupts, it would not issue that message. Now as to *why* that happens, I don't know. We've certainly had folk using Philips/NXP EHCI controllers successfully before. Maybe this board has a hardware problem, like a bad chip or not having wired up the power lines that OHCI controller uses. One small experiment would be to try using ports that will hand the device off to the *other* OHCI controller on that chip. If it's that kind of hardware issue, it might not apply to both of the OHCI controllers. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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