spi: bcm2835aux: Avoid 64-bit arithmetic in xfer len calc

Browse source

We want to check for xfers that are over 30 microseconds.  Rather than
find how many µs a xfer will take, instead find how many bytes can be
transferred in 30 µs.  The latter must be less than 32 bits (since our
clock speed is limited to 32 bits), while the former involves 64 bit
quantities and more arithmetic operations.

Signed-off-by: Trent Piepho <tpiepho@impinj.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

...

This commit is contained in:

Trent Piepho 2018-02-12 11:38:14 -08:00 • committed by Mark Brown

parent 7928b2cbe5

commit d704afffe6

No known key found for this signature in database

GPG key ID: 24D68B725D5487D0

1 changed files with 9 additions and 9 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

18

drivers/spi/spi-bcm2835aux.c

View file