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If graphics_desc and media_desc are not specified in a platform's xe_device_desc, treat this as an indication that the IP version should be determined from the hardware's GMD_ID register. Note that leaving media_desc unset for a platform that simply doesn't have the IP (e.g., PVC) is also okay --- a read of the GMD_ID register offset will be attempted, but since there's no register at that location a value of '0' will be returned, effectively disabling media support. Mapping of version -> IP description is done via a table lookup; this table will be re-used in future patches for some KUnit testing. v2: - Drop dummy structures. NULL can be safely used for both the GMD_ID cases and the "media not present case." - Use a table-based lookup of GMD_ID versions rather than a simple switch statement; the table will allow us to easily perform kunit testing of all the IP descriptors. Cc: Lucas De Marchi <lucas.demarchi@intel.com> Cc: Balasubramani Vivekanandan <balasubramani.vivekanandan@intel.com> Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com> Link: https://lore.kernel.org/r/20230406235621.1914492-8-matthew.d.roper@intel.com Signed-off-by: Matt Roper <matthew.d.roper@intel.com> Signed-off-by: Rodrigo Vivi <rodrigo.vivi@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.