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6d392d8daa
The platform can deny certain tunneling from the OS and it does that by clearing the control bits it does not want the OS to get and returning with OSC_CAPABILITIES_MASK_ERROR bit set. Currently we do not handle this properly so if this happens, for example when the platform denies PCIe tunneling, we just fail the whole negotiation and revert back to what the Thunderbolt driver is doing to figure out whether the controller is running firmware connection manager or not. However, we should honor what the platform returns. For this reason run the USB4 _OSC() first with query bit set, and then use the returned control double word (that may contain some of the bits cleared by the platform) and run it second time with query bit clear. While there, remove an extra space from the assignment of the control double word. Reported-by: NaamaX Shachar <naamax.shachar@intel.com> Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> |
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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.