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Commit366697018c("PCI: aardvark: Add PHY support") introduced configuration of PCIe Reference clock via PCIE_CORE_REF_CLK_REG register, but did it incorrectly. PCIe Reference clock differential pair is routed from system board to endpoint card, so on CPU side it has output direction. Therefore it is required to enable transmitting and disable receiving. Default configuration according to Armada 3700 Functional Specifications is enabled receiver part and disabled transmitter. We need this change because otherwise PCIe Reference clock is configured to some undefined state when differential pair is used for both transmitting and receiving. Fix this by disabling receiver part. Link: https://lore.kernel.org/r/20211005180952.6812-6-kabel@kernel.org Fixes:366697018c("PCI: aardvark: Add PHY support") Signed-off-by: Pali Rohár <pali@kernel.org> Signed-off-by: Marek Behún <kabel@kernel.org> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Reviewed-by: Marek Behún <kabel@kernel.org> Cc: stable@vger.kernel.org
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.