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Date: Wed, 18 Nov 2009 11:22:22 -0500 (EST) From: Alan Stern <stern@...land.harvard.edu> To: Alexander Holler <holler@...oftware.de> cc: Oliver Neukum <oliver@...kum.org>, <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org> Subject: Re: Problems with p55-express and sleeping usb-hds On Wed, 18 Nov 2009, Alexander Holler wrote: > Hello, > > I've done some more tests and have some more findings. > > After the problem occured (which looks for me like a timeout during a > wait for a CSW), ehci_hcd doesn't work anymore. Low- and full-speed > devices are still working and are recognized correctly, but no > high-speed device. After unloading ehci_hcd and reloading it, high-speed > devices are recognized correctly again. > As unloading is no option for kernels which have ehci_hcd compiled in > (like the F11-kernel), is there another option to reset the driver? You can unbind ehci-hcd from the controller by writing the controller's name to the "unbind" attribute in the appropriate sysfs directory. For example, on my system: # ls /sys/bus/pci/drivers/ehci_hcd 0000:00:1d.7 0000:01:00.2 0000:01:01.2 bind module new_id uevent unbind # echo -n 0000:00:1d.7 >/sys/bus/pci/drivers/ehci_hcd/unbind Then to rebind the driver, write the device name to the "bind" attribute: # echo -n 0000:00:1d.7 >/sys/bus/pci/drivers/ehci_hcd/bind Alan Stern -- 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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