linux-kernel - [PATCH v3 1/2] USB: quirks: Fix another ELAN touchscreen

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Message-Id: <1448372948-8861-2-git-send-email-adrienverge@gmail.com>
Date:	Tue, 24 Nov 2015 14:49:07 +0100
From:	Adrien Vergé <adrienverge@...il.com>
To:	Oliver Neukum <oneukum@...e.com>
Cc:	Jiri Kosina <jikos@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Logan Gunthorpe <logang@...tatee.com>,
	Hans de Goede <hdegoede@...hat.com>,
	Vincent Palatin <vpalatin@...omium.org>,
	Adrien Vergé <adrienverge@...il.com>,
	Macpaul Lin <macpaul@...il.com>,
	Adel Gadllah <adel.gadllah@...il.com>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-usb@...r.kernel.org
Subject: [PATCH v3 1/2] USB: quirks: Fix another ELAN touchscreen

Like other buggy models that had their fixes [1], the touchscreen with
id 04f3:21b8 from ELAN Microelectronics needs the device-qualifier
quirk. Otherwise, it fails to respond, blocks the boot for a random
amount of time and pollutes dmesg with:

[ 2887.373196] usb 1-5: new full-speed USB device number 41 using xhci_hcd
[ 2889.502000] usb 1-5: unable to read config index 0 descriptor/start: -71
[ 2889.502005] usb 1-5: can't read configurations, error -71
[ 2889.654571] usb 1-5: new full-speed USB device number 42 using xhci_hcd
[ 2891.783438] usb 1-5: unable to read config index 0 descriptor/start: -71
[ 2891.783443] usb 1-5: can't read configurations, error -71

[1]: See commits c68929f, 876af5d, d749947, a32c99e and dc703ec.

Tested-by: Adrien Vergé <adrienverge@...il.com>
Signed-off-by: Adrien Vergé <adrienverge@...il.com>
---
 drivers/usb/core/quirks.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/usb/core/quirks.c b/drivers/usb/core/quirks.c
index f5a3819..fcd6ac0 100644
--- a/drivers/usb/core/quirks.c
+++ b/drivers/usb/core/quirks.c
@@ -125,6 +125,9 @@ static const struct usb_device_id usb_quirk_list[] = {
 	{ USB_DEVICE(0x04f3, 0x016f), .driver_info =
 			USB_QUIRK_DEVICE_QUALIFIER },
 
+	{ USB_DEVICE(0x04f3, 0x21b8), .driver_info =
+			USB_QUIRK_DEVICE_QUALIFIER },
+
 	/* Roland SC-8820 */
 	{ USB_DEVICE(0x0582, 0x0007), .driver_info = USB_QUIRK_RESET_RESUME },
 
-- 
2.4.3

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