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[ Upstream commit ba8cf80724dbc09825b52498e4efacb563935408 ] 82580 NICs have a hardware bug that makes it necessary to write into the TSICR (TimeSync Interrupt Cause) register to clear it: https://lore.kernel.org/all/CDCB8BE0.1EC2C%25matthew.vick@intel.com/ Add a conditional so only for 82580 we write into the TSICR register, so we don't risk losing events for other models. Without this change, when running ptp4l with an Intel 82580 card, I get the following output: > timed out while polling for tx timestamp increasing tx_timestamp_timeout or > increasing kworker priority may correct this issue, but a driver bug likely > causes it This goes away with this change. This (partially) reverts commit ee14cc9ea19b ("igb: Fix missing time sync events"). Fixes: ee14cc9ea19b ("igb: Fix missing time sync events") Closes: https://lore.kernel.org/intel-wired-lan/CAN0jFd1kO0MMtOh8N2Ztxn6f7vvDKp2h507sMryobkBKe=xk=w@mail.gmail.com/ Tested-by: Daiwei Li <daiweili@google.com> Suggested-by: Vinicius Costa Gomes <vinicius.gomes@intel.com> Signed-off-by: Daiwei Li <daiweili@google.com> Acked-by: Vinicius Costa Gomes <vinicius.gomes@intel.com> Reviewed-by: Kurt Kanzenbach <kurt@linutronix.de> Tested-by: Pucha Himasekhar Reddy <himasekharx.reddy.pucha@intel.com> (A Contingent worker at Intel) Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com> Signed-off-by: Sasha Levin <sashal@kernel.org> |
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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.