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Christian Marangi says: ==================== net: mdio-ipq4019: fix wrong default MDC rate This was a long journey to arrive and discover this problem. To not waste too much char, there is a race problem with PHY and driver probe. This was observed with Aquantia PHY firmware loading. With some hacks the race problem was workarounded but an interesting thing was notice. It took more than a minute for the firmware to load via MDIO. This was strange as the same operation was done by UBoot in at max 5 second and the same data was loaded. A similar problem was observed on a mtk board that also had an Aquantia PHY where the load was very slow. It was notice that the cause was the MDIO bus running at a very low speed and the firmware was missing a property (present in mtk sdk) that set the right frequency to the MDIO bus. It was fun to find that THE VERY SAME PROBLEM is present on IPQ in a different form. The MDIO apply internally a division to the feed clock resulting in the bus running at 390KHz instead of 6.25Mhz. Searching around the web for some documentation and some include and analyzing the uboot codeflow resulted in the divider being set wrongly at /256 instead of /16 as the value was actually never set. Applying the value restore the original load time for the Aquantia PHY. This series mainly handle this by adding support for the "clock-frequency" property. Changes v3: - Add Reviewed-by tag - Fix english grammar error in comment - Drop DTS patch Changes v2: - Use DIV_ROUND_UP - Introduce logic to chose a default value for 802.3 spec 2.5MHz ==================== Signed-off-by: David S. Miller <davem@davemloft.net> |
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| README | ||
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.