This is a note to let you know that I've just added the patch titled
usb: dwc3: Do not get extcon device when usb-role-switch is used
to the 6.0-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-dwc3-do-not-get-extcon-device-when-usb-role-switch-is-used.patch
and it can be found in the queue-6.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From d68cc25b7c7fb3034c5a5b5f350a0b858c6d5a45 Mon Sep 17 00:00:00 2001
From: Janne Grunau <j@xxxxxxxxxx>
Date: Sun, 6 Nov 2022 22:48:04 +0100
Subject: usb: dwc3: Do not get extcon device when usb-role-switch is used
From: Janne Grunau <j@xxxxxxxxxx>
commit d68cc25b7c7fb3034c5a5b5f350a0b858c6d5a45 upstream.
The change breaks device tree based platforms with PHY device and use
usb-role-switch instead of an extcon switch. extcon_find_edev_by_node()
will return EPROBE_DEFER if it can not find a device so probing without
an extcon device will be deferred indefinitely. Fix this by
explicitly checking for usb-role-switch.
At least the out-of-tree USB3 support on Apple silicon based platforms
using dwc3 with tipd USB Type-C and PD controller is affected by this
issue.
Fixes: d182c2e1bc92 ("usb: dwc3: Don't switch OTG -> peripheral if extcon is present")
Cc: stable@xxxxxxxxxx
Signed-off-by: Janne Grunau <j@xxxxxxxxxx>
Acked-by: Thinh Nguyen <Thinh.Nguyen@xxxxxxxxxxxx>
Reviewed-by: Sven Peter <sven@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20221106214804.2814-1-j@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/dwc3/core.c | 10 ++++++++++
1 file changed, 10 insertions(+)
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -1711,6 +1711,16 @@ static struct extcon_dev *dwc3_get_extco
return extcon_get_extcon_dev(name);
/*
+ * Check explicitly if "usb-role-switch" is used since
+ * extcon_find_edev_by_node() can not be used to check the absence of
+ * an extcon device. In the absence of an device it will always return
+ * EPROBE_DEFER.
+ */
+ if (IS_ENABLED(CONFIG_USB_ROLE_SWITCH) &&
+ device_property_read_bool(dev, "usb-role-switch"))
+ return NULL;
+
+ /*
* Try to get an extcon device from the USB PHY controller's "port"
* node. Check if it has the "port" node first, to avoid printing the
* error message from underlying code, as it's a valid case: extcon
Patches currently in stable-queue which might be from j@xxxxxxxxxx are
queue-6.0/usb-dwc3-do-not-get-extcon-device-when-usb-role-switch-is-used.patch
