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Martin Blumenstingl says: ==================== RTL8211F: RGMII RX/TX delay configuration improvements In discussion with Andrew [0] we figured out that it would be best to make the RX delay of the RTL8211F PHY configurable (just like the TX delay is already configurable). While here I took the opportunity to add some logging to the TX delay configuration as well. There is no public documentation for the RX and TX delay registers. I received this information a while ago (and created this RfC patch back then: [1]). Realtek gave me permission to take the information from the datasheet extracts and phase them in my own words and publish that (I am not allowed to publish the datasheet extracts). I have tested these patches on two boards: - Amlogic Meson8b Odroid-C1 - Amlogic GXM Khadas VIM2 Both still behave as before these changes (iperf3 speeds are the same in both directions: RX and TX), which is expected because they are currently using phy-mode = "rgmii" with the RX delay not being generated by the PHY. [0] https://patchwork.ozlabs.org/patch/1215313/ [1] https://patchwork.ozlabs.org/patch/843946/ ==================== Signed-off-by: David S. Miller <davem@davemloft.net> |
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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.