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582e9a24fc
Right now, even when `delay_rts_before_send` and `delay_rts_after_send` are 0, the hrtimer is triggered (with timeout 0) which can introduce a few 100us of additional overhead on slower i.MX platforms. Implement a fast path when the delays are 0, where the RTS signal is toggled immediately instead of going through an hrtimer. This fast path behaves identical to the code before delay support was implemented. Reviewed-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Harald Seiler <hws@denx.de> Link: https://lore.kernel.org/r/20220119145204.238767-1-hws@denx.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
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| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
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| virt | ||
| .clang-format | ||
| .cocciconfig | ||
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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.