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Some endpoints need longer than the minimum Tperst_clk time of 100us that the PCIe specification allows for, as they may need to sequence internal resets off the stable output of internal PLLs prior to removal of fundamental reset. PCIe switches are an especially bad case, in some cases requiring up to 100 milliseconds for stable downstream link behaviour. Parse the DT property brcm,tperst-clk-ms and use this to hold PERST# low during brcm_pcie_start_link(). The BRCM RC typically outputs 200us of stable refclk before deasserting PERST#. By masking/forcing the output signal while deasserting the internal reset, the effect is to extend the length of time that the refclk is active and stable before PERST# is released. The TX lanes will enter the Polling state before PERST# is released, but this appears to be harmless. Signed-off-by: Jonathan Bell <jonathan@raspberrypi.com>
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.
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