[alsa-devel] [PATCH] usb: add USB_QUIRK_RESET_RESUME for M-Audio 49

[Jonathan Nieder]

Some USB MIDI keyboards fail to operate after a USB autosuspend.  The
device is recognized by ALSA, but no events are received and the
device goes quiet.

	$ amidi -l
	Dir Device    Name
	IO  hw:1,0,0  Oxygen 49 MIDI 1
	$ amidi -p hw:1,0,0 -d
	<... play some notes ...>
	^C
	0 bytes read

A workaround is to disable USB autosuspend for these devices by
putting AUTOSUSPEND_USBID_BLACKLIST="0763:2027" (resp. 0763:019b) in
/etc/laptop-mode/conf.d/usb-autosuspend.conf.  In the spirit of commit
166cb70e97bd ("usb: add USB_QUIRK_RESET_RESUME for M-Audio 88es"),
reset the device on resume so this workaround is not needed any more.

Noticed on a kernel close to 3.2.10.  Tested against 3.6.5.  Debian's
2.6.32.54-based kernel did not seem to be affected, though it's not
clear whether that is due to code or configuration.

Addresses http://bugs.debian.org/664068

Reported-and-tested-by: David Banks <amoebae at gmail.com> # Oxygen 49
Reported-and-tested-by: Olivier MATZ <zer0 at droids-corp.org> # KeyRig 49
Signed-off-by: Jonathan Nieder <jrnieder at gmail.com>
Cc: stable at vger.kernel.org
---
Thoughts?

 drivers/usb/core/quirks.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/usb/core/quirks.c b/drivers/usb/core/quirks.c
index fdefd9c7f7af..998c6a8290f6 100644
--- a/drivers/usb/core/quirks.c
+++ b/drivers/usb/core/quirks.c
@@ -105,6 +105,12 @@ static const struct usb_device_id usb_quirk_list[] = {
 	/* Midiman M-Audio Keystation 88es */
 	{ USB_DEVICE(0x0763, 0x0192), .driver_info = USB_QUIRK_RESET_RESUME },
 
+	/* Midiman M-Audio KeyRig 49 */
+	{ USB_DEVICE(0x0763, 0x019b), .driver_info = USB_QUIRK_RESET_RESUME },
+
+	/* Midiman M-Audio Oxygen 49 */
+	{ USB_DEVICE(0x0763, 0x2027), .driver_info = USB_QUIRK_RESET_RESUME },
+
 	/* M-Systems Flash Disk Pioneers */
 	{ USB_DEVICE(0x08ec, 0x1000), .driver_info = USB_QUIRK_RESET_RESUME },
 
-- 
1.8.0