Patch "USB: quirks: add quirk for Focusrite Scarlett" has been added to the 5.4-stable tree

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This is a note to let you know that I've just added the patch titled

    USB: quirks: add quirk for Focusrite Scarlett

to the 5.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     usb-quirks-add-quirk-for-focusrite-scarlett.patch
and it can be found in the queue-5.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From 9dc162e22387080e2d06de708b89920c0e158c9a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C5=81ukasz=20Bartosik?= <lb@xxxxxxxxxxxx>
Date: Mon, 24 Jul 2023 13:29:11 +0200
Subject: USB: quirks: add quirk for Focusrite Scarlett
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

From: Łukasz Bartosik <lb@xxxxxxxxxxxx>

commit 9dc162e22387080e2d06de708b89920c0e158c9a upstream.

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>
Cc: stable <stable@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20230724112911.1802577-1-lb@xxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/usb/core/quirks.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/usb/core/quirks.c
+++ b/drivers/usb/core/quirks.c
@@ -437,6 +437,10 @@ static const struct usb_device_id usb_qu
 	/* 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 },


Patches currently in stable-queue which might be from lb@xxxxxxxxxxxx are

queue-5.4/usb-quirks-add-quirk-for-focusrite-scarlett.patch



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