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From: Johan Hovold <johan@kernel.org>
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Date: Mon, 25 Aug 2014 17:51:27 +0200
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Subject: [PATCH] USB: quirks: enable device-qualifier quirk for Elan
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Touchscreen
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Enable device-qualifier quirk for Elan Touchscreen, which often fails to
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handle requests for the device_descriptor.
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Note that the device sometimes do respond properly with a Request Error
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(three times as USB core retries), but usually fails to respond at all.
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When this happens any further descriptor requests also fails, for
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example:
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[ 1528.688934] usb 2-7: new full-speed USB device number 4 using xhci_hcd
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[ 1530.945588] usb 2-7: unable to read config index 0 descriptor/start: -71
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[ 1530.945592] usb 2-7: can't read configurations, error -71
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This has been observed repeating for over a minute before eventual
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successful enumeration.
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Reported-by: Drew Von Spreecken <drewvs@gmail.com>
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Reported-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Signed-off-by: Johan Hovold <johan@kernel.org>
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Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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---
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drivers/usb/core/quirks.c | 4 ++++
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1 file changed, 4 insertions(+)
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diff --git a/drivers/usb/core/quirks.c b/drivers/usb/core/quirks.c
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index 814e712655e4..5ae883dc21f5 100644
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--- a/drivers/usb/core/quirks.c
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+++ b/drivers/usb/core/quirks.c
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@@ -93,6 +93,10 @@ static const struct usb_device_id usb_quirk_list[] = {
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{ USB_DEVICE(0x04e8, 0x6601), .driver_info =
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USB_QUIRK_CONFIG_INTF_STRINGS },
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+ /* Elan Touchscreen */
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+ { USB_DEVICE(0x04f3, 0x0089), .driver_info =
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+ USB_QUIRK_DEVICE_QUALIFIER },
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+
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/* Roland SC-8820 */
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{ USB_DEVICE(0x0582, 0x0007), .driver_info = USB_QUIRK_RESET_RESUME },
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--
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1.9.3
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