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31df7fadf5
The 2 callers of fusb302_set_cc_polarity both call fusb302_set_cc_pull directly before calling fusb302_set_cc_polarity, this is not ideal for 2 reasons: 1) fusb302_set_cc_pull uses the cached polarity when applying the pull-ups, which maybe changed immediately afterwards, to fix this set_cc_polarity already does the pull-up setting. 2) Both touch the SWITCHES0 register in a r-w-modify cycle, this leads to read reg, write reg, read reg, write reg. If we fold the setting of the pull-downs into fusb302_set_cc_polarity then not only can we avoid doing the reads / writes twice, at this point we set all bits, so we can skip the read, turning 4 (slowish) i2c-transfers into 1. Doing this also avoids the need to cache the pull_up state in struct fusb302_chip. Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Hans de Goede <hdegoede@redhat.com> Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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.