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[ Upstream commitca2dccdeeb] The Aquantia datasheet notes that after issuing a Processor-Intensive MDIO operation, like changing the low-power state of the device, the driver should wait for the operation to finish before issuing a new MDIO command. The new aqr107_wait_processor_intensive_op() function is added which can be used after these kind of MDIO operations. At the moment, we are only adding it at the end of the suspend/resume calls. The issue was identified on a board featuring the AQR113C PHY, on which commands like 'ip link (..) up / down' issued without any delays between them would render the link on the PHY to remain down. The issue was easy to reproduce with a one-liner: $ ip link set dev ethX down; ip link set dev ethX up; \ ip link set dev ethX down; ip link set dev ethX up; Fixes:ac9e81c230("net: phy: aquantia: add suspend / resume callbacks for AQR107 family") Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Link: https://lore.kernel.org/r/20220906130451.1483448-1-ioana.ciornei@nxp.com Signed-off-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
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.