Merge "usb: misc: lvstest: add entry to place port in compliance mode" (566de96b) · Commits · e / devices / android_kernel_fairphone_FP3

Documentation/ABI/testing/sysfs-bus-usb-lvstest

+13 −0

Original line number	Diff line number	Diff line
		@@ -45,3 +45,16 @@ Contact: Pratyush Anand <pratyush.anand@gmail.com>
		Description:
		Write to this node to issue "U3 exit" for Link Layer
		Validation device. It is needed for TD.7.36.

		What: /sys/bus/usb/devices/.../enable_compliance
		Date: July 2017
		Description:
		Write to this node to set the port to compliance mode to test
		with Link Layer Validation device. It is needed for TD.7.34.

		What: /sys/bus/usb/devices/.../warm_reset
		Date: July 2017
		Description:
		Write to this node to issue "Warm Reset" for Link Layer Validation
		device. It may be needed to properly reset an xHCI 1.1 host port if
		compliance mode needed to be explicitly enabled.

drivers/usb/misc/lvstest.c

+41 −0

Original line number	Diff line number	Diff line
		@@ -178,6 +178,25 @@ static ssize_t hot_reset_store(struct device *dev,
		}
		static DEVICE_ATTR_WO(hot_reset);

		static ssize_t warm_reset_store(struct device *dev,
		struct device_attribute attr, const char buf, size_t count)
		{
		struct usb_interface *intf = to_usb_interface(dev);
		struct usb_device *hdev = interface_to_usbdev(intf);
		struct lvs_rh *lvs = usb_get_intfdata(intf);
		int ret;

		ret = lvs_rh_set_port_feature(hdev, lvs->portnum,
		USB_PORT_FEAT_BH_PORT_RESET);
		if (ret < 0) {
		dev_err(dev, "can't issue warm reset %d\n", ret);
		return ret;
		}

		return count;
		}
		static DEVICE_ATTR_WO(warm_reset);

		static ssize_t u2_timeout_store(struct device *dev,
		struct device_attribute attr, const char buf, size_t count)
		{
		@@ -274,13 +293,35 @@ static ssize_t get_dev_desc_store(struct device *dev,
		}
		static DEVICE_ATTR_WO(get_dev_desc);

		static ssize_t enable_compliance_store(struct device *dev,
		struct device_attribute attr, const char buf, size_t count)
		{
		struct usb_interface *intf = to_usb_interface(dev);
		struct usb_device *hdev = interface_to_usbdev(intf);
		struct lvs_rh *lvs = usb_get_intfdata(intf);
		int ret;

		ret = lvs_rh_set_port_feature(hdev,
		lvs->portnum \| USB_SS_PORT_LS_COMP_MOD << 3,
		USB_PORT_FEAT_LINK_STATE);
		if (ret < 0) {
		dev_err(dev, "can't enable compliance mode %d\n", ret);
		return ret;
		}

		return count;
		}
		static DEVICE_ATTR_WO(enable_compliance);

		static struct attribute *lvs_attributes[] = {
		&dev_attr_get_dev_desc.attr,
		&dev_attr_u1_timeout.attr,
		&dev_attr_u2_timeout.attr,
		&dev_attr_hot_reset.attr,
		&dev_attr_warm_reset.attr,
		&dev_attr_u3_entry.attr,
		&dev_attr_u3_exit.attr,
		&dev_attr_enable_compliance.attr,
		NULL
		};