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To avoid a potential hang condition with TLB invalidation we need to enable masked bit 5 of MMIO 0xE5F0 at boot. Same workaround was in place for previous platforms, but the register offset has changed for CNL. But also BSpec doesn't mention the bit 15 as set on gen9 platforms and mark bit as reserved on CNL. v2: Improve commit message accepting Oscar's suggestion. Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com> Cc: Oscar Mateo <oscar.mateo@intel.com> Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com> Reviewed-by: Oscar Mateo <oscar.mateo@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20170823203504.10012-1-rodrigo.vivi@intel.com |
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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.