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CP110 based platforms rely on the bootloader for pci port initialization. TF-A actively prevents non-uboot re-configuration of pci lanes, and many boards do not have software control over the pci card reset. If a pci port had link at boot-time and the clock is stopped at a later point, the link fails and can not be recovered. PCI controller driver probe - and by extension ownership of a driver for the pci clocks - may be delayed especially on large modular kernels, causing the clock core to start disabling unused clocks. Add the CLK_IGNORE_UNUSED flag to the three pci port's clocks to ensure they are not stopped before the pci controller driver has taken ownership and tested for an existing link. This fixes failed pci link detection when controller driver probes late, e.g. with arm64 defconfig and CONFIG_PHY_MVEBU_CP110_COMPHY=m. Closes: https://lore.kernel.org/r/b71596c7-461b-44b6-89ab-3cfbd492639f@solid-run.com Signed-off-by: Josua Mayer <josua@solid-run.com> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.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 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.