linux-kernel - [PATCH 2/2] usb: dwc3: pci add property to allow user space role switch

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Message-ID: <20210823184449.2796184-3-Nehal-Bakulchandra.shah@amd.com>
Date:   Tue, 24 Aug 2021 00:14:49 +0530
From:   Nehal Bakulchandra Shah <Nehal-Bakulchandra.shah@....com>
To:     <balbi@...nel.org>, <gregkh@...uxfoundation.org>
CC:     <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <kun.liu2@....com>, <alexander.deucher@....com>,
        Nehal Bakulchandra Shah <Nehal-Bakulchandra.shah@....com>
Subject: [PATCH 2/2] usb: dwc3: pci add property to allow user space role switch

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@....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