[PATCH v6 4/4] usb: doc: add document for USB3 debug port usage

[Lu Baolu]

Add Documentation/usb/usb3-debug-port.rst. This document includes
the user guide for USB3 debug port.

Cc: linux-doc@xxxxxxxxxxxxxxx
Signed-off-by: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
---
 Documentation/usb/usb3-debug-port.rst | 98 +++++++++++++++++++++++++++++++++++
 1 file changed, 98 insertions(+)
 create mode 100644 Documentation/usb/usb3-debug-port.rst

diff --git a/Documentation/usb/usb3-debug-port.rst b/Documentation/usb/usb3-debug-port.rst
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+===============
+USB3 debug port
+===============
+
+:Author: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
+:Date: January 2017
+
+GENERAL
+=======
+
+This is a HOWTO for using USB3 debug port on x86 systems.
+
+Before using any kernel debugging functionality based on USB3
+debug port, you need to check 1) whether debug port is supported
+by the xHCI host; 2) which port is used for debugging purposes
+(normally the first USB3 root port). You must have a USB 3.0
+super-speed A-to-A debugging cable to connect the debug target
+with a debug host. In this document, "debug target" stands for
+the system under debugging, and "debug host" stands for a
+stand-alone system that is able to talk to the debugging target
+through the USB3 debug port.
+
+EARLY PRINTK
+============
+
+On the debug target system, you need to customize a debugging
+kernel with CONFIG_EARLY_PRINTK_USB_XDBC enabled. And, add
+below kernel boot parameter::
+
+	"earlyprintk=xdbc"
+
+If there are multiple xHCI controllers in the system, you can
+append a host contoller index to this kernel parameter. This
+index starts from 0.
+
+If you are going to use the "keep" option defined by the
+early printk framework to keep the boot console alive after
+early boot, you'd better add below kernel boot parameter::
+
+	"usbcore.autosuspend=-1"
+
+On the debug host side, you don't need to customize the kernel,
+but you'd better disable usb subsystem runtime power management
+by adding below kernel boot parameter::
+
+	"usbcore.autosuspend=-1"
+
+Before starting the debug target, you should connect the debug
+port on the debug target with a root port or port of any external
+hub on the debug host. The cable used to connect these two ports
+should be a USB 3.0 super-speed A-to-A debugging cable.
+
+During early boot of the debug target, DbC (xHCI debug engine for
+USB3 debug port) hardware will be detected and initialized. After
+initialization, the debug host should be able to enumerate the
+debug target as a debug device. The debug host will then bind the
+debug device with the usb_debug driver module and create the
+/dev/ttyUSB0 device.
+
+If the debug device enumeration goes smoothly, you should be able
+to see below kernel messages on the debug host::
+
+	# tail -f /var/log/kern.log
+	[ 1815.983374] usb 4-3: new SuperSpeed USB device number 4 using xhci_hcd
+	[ 1815.999595] usb 4-3: LPM exit latency is zeroed, disabling LPM.
+	[ 1815.999899] usb 4-3: New USB device found, idVendor=1d6b, idProduct=0004
+	[ 1815.999902] usb 4-3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
+	[ 1815.999903] usb 4-3: Product: Remote GDB
+	[ 1815.999904] usb 4-3: Manufacturer: Linux
+	[ 1815.999905] usb 4-3: SerialNumber: 0001
+	[ 1816.000240] usb_debug 4-3:1.0: xhci_dbc converter detected
+	[ 1816.000360] usb 4-3: xhci_dbc converter now attached to ttyUSB0
+
+You can run below bash scripts on the debug host to read the kernel
+log sent from debug target.
+
+.. code-block:: sh
+
+	===== start of bash scripts =============
+	#!/bin/bash
+
+	while true ; do
+		while [ ! -d /sys/class/tty/ttyUSB0 ] ; do
+			:
+	done
+	cat /dev/ttyUSB0 >> xdbc.log
+	done
+	===== end of bash scripts ===============
+
+You should be able to see the early boot message in xdbc.log.
+
+If it doesn't work, please ask it on the <linux-usb@xxxxxxxxxxxxxxx>
+mailing list.
+
+Below USB hosts have been verified to work::
+
+	Intel Corporation Sunrise Point-H USB 3.0 xHCI Controller
+	Intel Corporation Wildcat Point-LP USB xHCI Controller
-- 
2.1.4