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From: Nehal Bakulchandra Shah <Nehal-Bakulchandra.shah@amd.com>
To: <balbi@kernel.org>, <gregkh@linuxfoundation.org>
Cc: <linux-usb@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
	<kun.liu2@amd.com>, <alexander.deucher@amd.com>,
	Nehal Bakulchandra Shah <Nehal-Bakulchandra.shah@amd.com>
Subject: [PATCH 2/2] usb: dwc3: pci add property to allow user space role switch
Date: Tue, 24 Aug 2021 00:14:49 +0530	[thread overview]
Message-ID: <20210823184449.2796184-3-Nehal-Bakulchandra.shah@amd.com> (raw)
In-Reply-To: <20210823184449.2796184-1-Nehal-Bakulchandra.shah@amd.com>

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@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


  parent reply	other threads:[~2021-08-23 18:45 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-23 18:44 [PATCH 0/2] Add DWC3 controller suppport for AMD's platforms Nehal Bakulchandra Shah
2021-08-23 18:44 ` [PATCH 1/2] usb: dwc3: pci: add support for AMD's newer generation platform Nehal Bakulchandra Shah
2021-08-24  8:19   ` Felipe Balbi
2021-08-23 18:44 ` Nehal Bakulchandra Shah [this message]
2021-08-24  8:19   ` [PATCH 2/2] usb: dwc3: pci add property to allow user space role switch Felipe Balbi
2021-08-24 16:02     ` Shah, Nehal-bakulchandra
2021-08-24 16:17       ` Felipe Balbi
2021-08-24 16:28         ` Shah, Nehal-bakulchandra
2021-08-24 16:54           ` Felipe Balbi

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