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55397ce8df
When booting a MacBookPro9,1, duplicate link downtraining messages are logged for the devices directly attached to the two CPU-internal Root Ports of the Core i7 3615QM: Once on device enumeration and once on enablement of the bandwidth notification interrupt on the Root Ports. Duplicate messages do not occur with Root Ports on the PCH and Downstream Ports on the Thunderbolt controller: Only a single message is logged for these, namely on device enumeration. The reason for the duplicate messages is a stale interrupt in the Link Status register of the 3615QM's internal Root Ports. Avoid by clearing the interrupt before enabling it. An alternative approach would be to clear the interrupt already on device enumeration or to report link downtraining only if the speed has changed. That way, link downtraining occurring between device enumeration and enablement of the bandwidth notification interrupt could be caught. However clearing stale interrupts before enabling them is a standard operating procedure for any driver and keeping the two steps in one place makes the code easier to follow. Signed-off-by: Lukas Wunner <lukas@wunner.de> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Alexandru Gagniuc <alex.gagniuc@dellteam.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.