For AMD platform there is a requirement to enable user space role
switch from host to device and device to host by means of running
following commands.
HOST: echo host > /sys/class/usb_role/dwc3.0.auto-role-switch/role
DEVICE: echo device > /sys/class/usb_role/dwc3.0.auto-role-switch/role
Signed-off-by: Nehal Bakulchandra Shah <Nehal-Bakulchandra.shah@xxxxxxx>
---
drivers/usb/dwc3/drd.c | 2 ++
drivers/usb/dwc3/dwc3-pci.c | 1 +
2 files changed, 3 insertions(+)
diff --git a/drivers/usb/dwc3/drd.c b/drivers/usb/dwc3/drd.c
index 8fcbac10510c..6d579780ffcc 100644
--- a/drivers/usb/dwc3/drd.c
+++ b/drivers/usb/dwc3/drd.c
@@ -555,6 +555,8 @@ static int dwc3_setup_role_switch(struct dwc3 *dwc)
mode = DWC3_GCTL_PRTCAP_DEVICE;
}
+ if (device_property_read_bool(dwc->dev, "allow-userspace-role-switch"))
+ dwc3_role_switch.allow_userspace_control = true;
dwc3_role_switch.fwnode = dev_fwnode(dwc->dev);
dwc3_role_switch.set = dwc3_usb_role_switch_set;
dwc3_role_switch.get = dwc3_usb_role_switch_get;
diff --git a/drivers/usb/dwc3/dwc3-pci.c b/drivers/usb/dwc3/dwc3-pci.c
index 7ff8fc8f79a9..c1412a6e85b6 100644
--- a/drivers/usb/dwc3/dwc3-pci.c
+++ b/drivers/usb/dwc3/dwc3-pci.c
@@ -153,6 +153,7 @@ static const struct property_entry dwc3_pci_mr_properties[] = {
PROPERTY_ENTRY_STRING("dr_mode", "otg"),
PROPERTY_ENTRY_BOOL("usb-role-switch"),
PROPERTY_ENTRY_STRING("role-switch-default-mode", "host"),
+ PROPERTY_ENTRY_BOOL("allow-userspace-role-switch"),
PROPERTY_ENTRY_BOOL("linux,sysdev_is_parent"),
{}
};
--
2.25.1
