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Subject[PATCH 1/1] usb: doc: Update document for USB3 debug port usage
Date
Update Documentation/driver-api/usb/usb3-debug-port.rst. This update
includes the guide for using xHCI debug capability based TTY serial
link.

Cc: Mathias Nyman <mathias.nyman@linux.intel.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
---
Documentation/driver-api/usb/usb3-debug-port.rst | 52 ++++++++++++++++++++++++
1 file changed, 52 insertions(+)

diff --git a/Documentation/driver-api/usb/usb3-debug-port.rst b/Documentation/driver-api/usb/usb3-debug-port.rst
index feb1a36..b9fd131 100644
--- a/Documentation/driver-api/usb/usb3-debug-port.rst
+++ b/Documentation/driver-api/usb/usb3-debug-port.rst
@@ -98,3 +98,55 @@ you to check the sanity of the setup.
cat /dev/ttyUSB0
done
===== end of bash scripts ===============
+
+Serial TTY
+==========
+
+The DbC support has been added to the xHCI driver. You can get a
+debug device provided by the DbC at runtime.
+
+In order to use this, you need to make sure your kernel has been
+configured to support USB_XHCI_DBGCAP. A sysfs attribute under
+the xHCI device node is used to enable or disable DbC. By default,
+DbC is disabled::
+
+ root@target:/sys/bus/pci/devices/0000:00:14.0# cat dbc
+ disabled
+
+Enable DbC with the following command::
+
+ root@target:/sys/bus/pci/devices/0000:00:14.0# echo enable > dbc
+
+You can check the DbC state at anytime::
+
+ root@target:/sys/bus/pci/devices/0000:00:14.0# cat dbc
+ enabled
+
+Connect the debug target to the debug host with a USB 3.0 super-
+speed A-to-A debugging cable. You can see /dev/ttyDBC0 created
+on the debug target. You will see below kernel message lines::
+
+ root@target: tail -f /var/log/kern.log
+ [ 182.730103] xhci_hcd 0000:00:14.0: DbC connected
+ [ 191.169420] xhci_hcd 0000:00:14.0: DbC configured
+ [ 191.169597] xhci_hcd 0000:00:14.0: DbC now attached to /dev/ttyDBC0
+
+Accordingly, the DbC state has been brought up to::
+
+ root@target:/sys/bus/pci/devices/0000:00:14.0# cat dbc
+ configured
+
+On the debug host, you will see the debug device has been enumerated.
+You will see below kernel message lines::
+
+ root@host: tail -f /var/log/kern.log
+ [ 79.454780] usb 2-2.1: new SuperSpeed USB device number 3 using xhci_hcd
+ [ 79.475003] usb 2-2.1: LPM exit latency is zeroed, disabling LPM.
+ [ 79.475389] usb 2-2.1: New USB device found, idVendor=1d6b, idProduct=0010
+ [ 79.475390] usb 2-2.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
+ [ 79.475391] usb 2-2.1: Product: Linux USB Debug Target
+ [ 79.475392] usb 2-2.1: Manufacturer: Linux Foundation
+ [ 79.475393] usb 2-2.1: SerialNumber: 0001
+
+The debug device works now. You can use any communication or debugging
+program to talk between the host and the target.
--
2.7.4
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