tree d06e192b7c1a94926d4b8f79f515cabb37bbee1e
parent fe23aa9a1670b8800b251fc0400425e765c81880
author Wolfram Sang <wsa+renesas@sang-engineering.com> 1509826809 +0100
committer Wolfram Sang <wsa@the-dreams.de> 1512332700 +0100

i2c: rcar: skip DMA if buffer is not safe

This HW is prone to races, so it needs to setup new messages in irq
context. That means we can't alloc bounce buffers if a message buffer is
not DMA safe. So, in that case, simply fall back to PIO.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>