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184434fcd6In mx51_ecspi_prepare_message() the MX51_ECSPI_CONFIG register is setup for the current spi_message. After writing the register, there is a delay to ensure that the changes hit the hardware. This patch checks if the register MX51_ECSPI_CONFIG actually needs to be changed. If the register content is unchanged the function is left early, skipping the write to the hardware and the delay. This leads to a small, but measurable performance increase. For a given workload with small transfers on an imx6 single core the CPU load decreases from 30% to ~27%. Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de> Link: https://lore.kernel.org/r/20220502175457.1977983-10-mkl@pengutronix.de Signed-off-by: Mark Brown <broonie@kernel.org> |
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| README | ||
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.