From: Sven Peter sven@svenpeter.dev
stable inclusion from stable-v5.10.114 commit 140801d3fbd3b0bd605cffda7f8a5331d345b4b0 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I5IY1V
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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commit ab7aa2866d295438dc60522f85c5421c6b4f1507 upstream.
If the PHY controller node has a "port" dwc3 tries to find an extcon device even when "usb-role-switch" is present. This happens because dwc3_get_extcon() sees that "port" node and then calls extcon_find_edev_by_node() which will always return EPROBE_DEFER in that case.
On the other hand, even if an extcon was present and dwc3_get_extcon() was successful it would still be ignored in favor of "usb-role-switch".
Let's just first check if "usb-role-switch" is configured in the device tree and directly use it instead and only try to look for an extcon device otherwise.
Fixes: 8a0a13799744 ("usb: dwc3: Registering a role switch in the DRD code.") Cc: stable stable@kernel.org Signed-off-by: Sven Peter sven@svenpeter.dev Link: https://lore.kernel.org/r/20220411155300.9766-1-sven@svenpeter.dev Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com Acked-by: Xie XiuQi xiexiuqi@huawei.com --- drivers/usb/dwc3/drd.c | 11 +++++------ 1 file changed, 5 insertions(+), 6 deletions(-)
diff --git a/drivers/usb/dwc3/drd.c b/drivers/usb/dwc3/drd.c index 3e1c1aacf002..0a96f44ccca7 100644 --- a/drivers/usb/dwc3/drd.c +++ b/drivers/usb/dwc3/drd.c @@ -568,16 +568,15 @@ int dwc3_drd_init(struct dwc3 *dwc) { int ret, irq;
+ if (ROLE_SWITCH && + device_property_read_bool(dwc->dev, "usb-role-switch")) + return dwc3_setup_role_switch(dwc); + dwc->edev = dwc3_get_extcon(dwc); if (IS_ERR(dwc->edev)) return PTR_ERR(dwc->edev);
- if (ROLE_SWITCH && - device_property_read_bool(dwc->dev, "usb-role-switch")) { - ret = dwc3_setup_role_switch(dwc); - if (ret < 0) - return ret; - } else if (dwc->edev) { + if (dwc->edev) { dwc->edev_nb.notifier_call = dwc3_drd_notifier; ret = extcon_register_notifier(dwc->edev, EXTCON_USB_HOST, &dwc->edev_nb);