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The MDIO clock divisor register setting was only applied on the initial startup when the driver was loaded. However, this setting is cleared when the device is reset, such as would occur when the interface was taken down and brought up again, and so the MDIO bus would be non-functional afterwards. Split up the MDIO bus setup and enable into separate functions and re-enable the bus after a device reset, to ensure that the MDIO registers are set properly. This also allows us to remove direct access to MDIO registers in xilinx_axienet_main.c and centralize them all in xilinx_axienet_mdio.c. Also, lock the MDIO bus lock around the device reset process, to avoid MDIO accesses from occurring while the MDIO is disabled during the reset. Signed-off-by: Robert Hancock <hancock@sedsystems.ca> Signed-off-by: David S. Miller <davem@davemloft.net>
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.