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We can't safely probe Type C ports, whether they are a legacy or a USB/Thunderbolt DP Alternate Type C port. This would require performing the TypeC connect sequence - as described by the specification - but that may have unwanted side-effects. These side-effects include at least - without completeness - timeouts during AUX power well enabling and subsequent PLL enabling errors. To safely identify these ports we really need VBT, which has the proper flag for this (ddi_vbt_port_info::supports_typec_usb, supports_tbt). Based on the above disable Type C ports if we can't load VBT for some reason. v2: - Notice that we disable TypeC ports completely and simplify accordingly (Jose). - Add code comment explaining why we disabled the ports. (Jani) Cc: Jani Nikula <jani.nikula@intel.com> Cc: Paulo Zanoni <paulo.r.zanoni@intel.com> Cc: Jose Roberto de Souza <jose.souza@intel.com> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Cc: Rodrigo Vivi <rodrigo.vivi@intel.com> Signed-off-by: Imre Deak <imre.deak@intel.com> Reviewed-by: José Roberto de Souza <jose.souza@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190128114242.28666-1-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.