From dfba2174dc421ecad8dc50741054a305cd3ba681 Mon Sep 17 00:00:00 2001 From: Lu Baolu Date: Fri, 8 Dec 2017 17:59:10 +0200 Subject: usb: xhci: Add DbC support in xHCI driver xHCI compatible USB host controllers(i.e. super-speed USB3 controllers) can be implemented with the Debug Capability(DbC). It presents a debug device which is fully compliant with the USB framework and provides the equivalent of a very high performance full-duplex serial link. The debug capability operation model and registers interface are defined in 7.6.8 of the xHCI specification, revision 1.1. The DbC debug device shares a root port with the xHCI host. By default, the debug capability is disabled and the root port is assigned to xHCI. When the DbC is enabled, the root port will be assigned to the DbC debug device, and the xHCI sees nothing on this port. This implementation uses a sysfs node named under the xHCI device to manage the enabling and disabling of the debug capability. When the debug capability is enabled, it will present a debug device through the debug port. This debug device is fully compliant with the USB3 framework, and it can be enumerated by a debug host on the other end of the USB link. As soon as the debug device is configured, a TTY serial device named /dev/ttyDBC0 will be created. Signed-off-by: Lu Baolu Signed-off-by: Mathias Nyman Signed-off-by: Greg Kroah-Hartman --- .../ABI/testing/sysfs-bus-pci-drivers-xhci_hcd | 25 ++++++++++++++++++++++ 1 file changed, 25 insertions(+) create mode 100644 Documentation/ABI/testing/sysfs-bus-pci-drivers-xhci_hcd (limited to 'Documentation/ABI/testing') diff --git a/Documentation/ABI/testing/sysfs-bus-pci-drivers-xhci_hcd b/Documentation/ABI/testing/sysfs-bus-pci-drivers-xhci_hcd new file mode 100644 index 0000000..0088aba --- /dev/null +++ b/Documentation/ABI/testing/sysfs-bus-pci-drivers-xhci_hcd @@ -0,0 +1,25 @@ +What: /sys/bus/pci/drivers/xhci_hcd/.../dbc +Date: June 2017 +Contact: Lu Baolu +Description: + xHCI compatible USB host controllers (i.e. super-speed + USB3 controllers) are often implemented with the Debug + Capability (DbC). It can present a debug device which + is fully compliant with the USB framework and provides + the equivalent of a very high performance full-duplex + serial link for debug purpose. + + The DbC debug device shares a root port with xHCI host. + When the DbC is enabled, the root port will be assigned + to the Debug Capability. Otherwise, it will be assigned + to xHCI. + + Writing "enable" to this attribute will enable the DbC + functionality and the shared root port will be assigned + to the DbC device. Writing "disable" to this attribute + will disable the DbC functionality and the shared root + port will roll back to the xHCI. + + Reading this attribute gives the state of the DbC. It + can be one of the following states: disabled, enabled, + initialized, connected, configured and stalled. -- cgit v1.1