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>From the RK3588 Technical Reference Manual, Part1, section 6.19 PCIe3PHY_GRF Register Description: "rxX_cmn_refclk_mode" RX common reference clock mode for lane X. This mode should be enabled only when the far-end and near-end devices are running with a common reference clock. The hardware reset value for this field is 0x1 (enabled). Note that this register field is only available on RK3588, not on RK3568. The link training either fails or is highly unstable (link state will jump continuously between L0 and recovery) when this mode is enabled while using an endpoint running in Separate Reference Clock with No SSC (SRNS) mode or Separate Reference Clock with SSC (SRIS) mode. (Which is usually the case when using a real SoC as endpoint, e.g. the RK3588 PCIe controller can run in both Root Complex and Endpoint mode.) Add support for the device tree property rockchip,rx-common-refclk-mode, such that the PCIe PHY can be used in configurations where the Root Complex and Endpoint are not using a common reference clock. Signed-off-by: Niklas Cassel <cassel@kernel.org> Link: https://lore.kernel.org/r/20240412125818.17052-3-cassel@kernel.org Signed-off-by: Vinod Koul <vkoul@kernel.org> |
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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 reStructuredText 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.