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* [RESEND PATCH 2/2] usb: dwc3: pci add property to allow user space role switch
@ 2021-08-24 19:23 Nehal Bakulchandra Shah
  2021-08-25  5:55 ` Felipe Balbi
  2021-08-26 11:13 ` Greg KH
  0 siblings, 2 replies; 10+ messages in thread
From: Nehal Bakulchandra Shah @ 2021-08-24 19:23 UTC (permalink / raw)
  To: balbi, gregkh
  Cc: linux-usb, linux-kernel, kun.liu2, alexander.deucher,
	Nehal Bakulchandra Shah

For AMD platform there is a requirement to enable user space role
switch from host to device and device to host as customer platform is not
completely capable of OTG i.e. with type C controller it does not have PD
to support role switching. Hence, based ACPI/EC interrupt role switch is
triggered by the usemode script running in background.

Signed-off-by: Nehal Bakulchandra Shah <Nehal-Bakulchandra.shah@amd.com>
---
 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


^ permalink raw reply	[flat|nested] 10+ messages in thread

end of thread, other threads:[~2021-09-09 13:35 UTC | newest]

Thread overview: 10+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-08-24 19:23 [RESEND PATCH 2/2] usb: dwc3: pci add property to allow user space role switch Nehal Bakulchandra Shah
2021-08-25  5:55 ` Felipe Balbi
2021-08-25  7:01   ` Heikki Krogerus
2021-08-25  7:26     ` Heikki Krogerus
2021-08-25 13:50       ` Deucher, Alexander
2021-08-26 14:06         ` Heikki Krogerus
2021-09-02 12:45           ` Shah, Nehal-bakulchandra
2021-09-09 12:55             ` Heikki Krogerus
2021-08-25  7:43     ` Felipe Balbi
2021-08-26 11:13 ` Greg KH

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