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The existing implementation for clkreq-mode="safe" leaves the HARD_DEBUG with both control bits clear. This can cause link failure if L1 sub-states are enabled and if either of these conditions occurrs: - The platform does not connect the CLRKEQ# signal to the EP, and a pull-up is present on the line - The platform connects the signal to the EP, and the EP enters an L1.x or ClkPM state Additional register bits in the HARD_DEBUG register can be used to force the RC to drive CLKREQ# low. Also, un-advertise L1ss as a) additional power savings can't be realised and b) enabling L1ss may incur additional wake latency from L1.0. 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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