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R Kannappan
10904df3f2
USB4 specification defines the metadata needed to perform software margining, as well as the necessary steps which include waiting for dwell time. - Add dwell_time attribute to set the wait time while performing margining and checking for link errors. - Add error_counter attribute to configure error counter prior to margining test. - Add voltage_time_offset attribute to set the voltage or time offset steps before performing the software margining test. - Perform software margining test for dwell duration, break if there are link errors, stop the clocks and provide results. Below is a minimalistic example how this can be used. Note these values are just examples. The exact values in practice depend on host specific capabilities and the type of measurement to be performed. # cd /sys/kernel/debug/thunderbolt/ROUTER/portX/margining/ # echo software > mode # echo 400 > dwell_time # echo 1 > run As usual the results attribute contains the results of a succesfull run. Signed-off-by: R Kannappan <r.kannappan@intel.com> Co-developed-by: Rene Sapiens <rene.sapiens@intel.com> Signed-off-by: Rene Sapiens <rene.sapiens@intel.com> Co-developed-by: Aapo Vienamo <aapo.vienamo@linux.intel.com> Signed-off-by: Aapo Vienamo <aapo.vienamo@linux.intel.com> Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.