[PATCH] USB: quirks: add quirk for Focusrite Scarlett

[Łukasz Bartosik]

The Focusrite Scarlett audio device does not behave correctly during
resumes. Below is what happens during every resume (captured with
Beagle 5000):

<Suspend>
<Resume>
<Reset>/<Chirp J>/<Tiny J>
<Reset/Target disconnected>
<High Speed>

The Scarlett disconnects and is enumerated again.

However from time to time it drops completely off the USB bus during
resume. Below is captured occurrence of such an event:

<Suspend>
<Resume>
<Reset>/<Chirp J>/<Tiny J>
<Reset>/<Chirp K>/<Tiny K>
<High Speed>
<Corrupted packet>
<Reset/Target disconnected>

To fix the condition a user has to unplug and plug the device again.

With USB_QUIRK_RESET_RESUME applied ("usbcore.quirks=1235:8211:b")
for the Scarlett audio device the issue still reproduces. 

Applying USB_QUIRK_DISCONNECT_SUSPEND ("usbcore.quirks=1235:8211:m")
fixed the issue and the Scarlett audio device didn't drop off the USB
bus for ~5000 suspend/resume cycles where originally issue reproduced in
~100 or less suspend/resume cycles.

Signed-off-by: Łukasz Bartosik <lb@xxxxxxxxxxxx>
---
 drivers/usb/core/quirks.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/usb/core/quirks.c b/drivers/usb/core/quirks.c
index 934b3d997..15e9bd180 100644
--- a/drivers/usb/core/quirks.c
+++ b/drivers/usb/core/quirks.c
@@ -436,6 +436,10 @@ static const struct usb_device_id usb_quirk_list[] = {
 	/* novation SoundControl XL */
 	{ USB_DEVICE(0x1235, 0x0061), .driver_info = USB_QUIRK_RESET_RESUME },
 
+	/* Focusrite Scarlett Solo USB */
+	{ USB_DEVICE(0x1235, 0x8211), .driver_info =
+			USB_QUIRK_DISCONNECT_SUSPEND },
+
 	/* Huawei 4G LTE module */
 	{ USB_DEVICE(0x12d1, 0x15bb), .driver_info =
 			USB_QUIRK_DISCONNECT_SUSPEND },
-- 
2.38.3