i2c: rcar: improve bus busy detection

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I2C doesn't define a timeout for bus busy, so an arbitrary value like
LOOP_TIMEOUT is not a good idea. Let's use the timeout value in struct
adapter which is meant for such cases and is user-configurable (via
IOCTL). To reduce the load, wait 10us instead of 1us which is good
enough for the slow frequencies used by I2C. Finally, use the
poll_timeout helper instead of open coding it.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Signed-off-by: Wolfram Sang <wsa@kernel.org>

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Wolfram Sang 2020-08-29 22:38:09 +02:00 • committed by Wolfram Sang

parent 6af0771946

commit 9374ed1dfe

1 changed files with 10 additions and 9 deletions

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drivers/i2c/busses/i2c-rcar.c

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