732f374e23
Add initial BYTE_ORDER read to sync the 32-bit accesses over the 16-bit mdio bus to improve driver robustness. The lan9303 expects two mdio read transactions back-to-back to read a 32-bit register. The first read transaction causes the other half of the 32-bit register to get latched. The subsequent read returns the latched second half of the 32-bit read. The BYTE_ORDER register is an exception to this rule. As it is a constant value, there is no need to latch the second half. We read this register first in case there were reads during the boot loader process that might have occurred prior to this driver taking over ownership of accessing this device. This patch has been tested on the SAMA5D3-EDS with a LAN9303 RMII daughter card. Signed-off-by: Jerry Ray <jerry.ray@microchip.com> 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.