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Apparently SKL/KBL/CFL need some manual help to get the programmed HDMI vswing to stick. Implement the relevant workaround (display w/a #1143). Note that the relevant chicken bits live in a transcoder register even though the bits affect a specific DDI port rather than a specific transcoder. Hence we must pick the correct transcoder register instance based on the port rather than based on the cpu_transcoder. Also note that for completeness I included support for DDI A/E in the code even though we never have HDMI on those ports. v2: CFL needs the w/a as well (Rodrigo and Art) Cc: Rodrigo Vivi <rodrigo.vivi@intel.com> Cc: Art Runyan <arthur.j.runyan@intel.com> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180122174131.28046-1-ville.syrjala@linux.intel.com Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.