1e9ae61d17
Currently we clear the leftover vswing/preemphasis values only at the start of link training. That means the initial vswing programming performed during modeset is going to use stale values left over from the previous link training sequence, and then at the start of link training we're going to reset the levels back to 0. Seems much better to make sure we start with level 0 from the get go. Additionally if LTTPRs are present the leftover vswing/preemphasis values are those of the last link in the chain, so not the values that our PHY is even using after a successful link training sequence. So let's make sure everything is cleared up before we start programming anything. Suggested-by: Imre Deak <imre.deak@intel.com> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20210930134310.31669-1-ville.syrjala@linux.intel.com Reviewed-by: Imre Deak <imre.deak@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 Restructured Text 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.