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87f88dfcde
Paul pointed out that the 50-ms sleep during OHCI initialization takes up a large fraction of a system's boot time. Things get worse when there are two OHCI controllers present, each requiring 50 ms. However, there really is no need to send a 50-ms reset signal out all the root-hub ports during initialization. The ports themselves will be disabled, and the only way to enable a port is to reset it. Therefore all attached USB devices will receive a proper reset in any case. The controller reset does not need to be long enough to reset those other devices, so the 50-ms delay isn't necessary. Without the delay, there is no remaining incentive for skipping the reset when the controller is already in the RESET state. This patch removes the test, issuing the command unconditionally, and removes the following delay. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Suggested-by: Paul Menzel <pmenzel@molgen.mpg.de> Tested-by: Paul Menzel <pmenzel@molgen.mpg.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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.
See Documentation/00-INDEX for a list of what is contained in each file.
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.