3ce98018c8
There are specific DPCDs defined for detecting link failures between the PCON and HDMI sink and check the link status. In case of link failure, PCON will communicate the same using an IRQ_HPD to source. HDMI sink would have indicated the same to PCON using SCDC interrupt mechanism. While source can always read final HDMI sink's status using I2C over AUX, it is easier and faster to read the PCONs already read HDMI sink status registers. This patch adds the DPCDs required for link failure detection and provide a helper function for printing error count/lane which might help in debugging the link failure issues. v2: Addressed comments from Uma Shankar: -rephrased the commit message, as per the code. -fixed styling issues -added documentation for the helper function. Signed-off-by: Swati Sharma <swati2.sharma@intel.com> Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com> Reviewed-by: Uma Shankar <uma.shankar@intel.com> [Jani: Fixed checkpatch PARENTHESIS_ALIGNMENT.] Signed-off-by: Jani Nikula <jani.nikula@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20201218103723.30844-6-ankit.k.nautiyal@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.