tree 159196282922d63c2c2a5dc52f7f6053060fb0f2
parent b2c7f5d9c939a37c1ce7f86a642de70e3033ee9e
author Elaine Zhang <zhangqing@rock-chips.com> 1471510915 +0800
committer Mark Brown <broonie@kernel.org> 1471514952 +0100

regmap: drop cache if the bus transfer error

regmap_write
->_regmap_raw_write
-->regcache_write first and than use map->bus->write to wirte i2c or spi
But if the i2c or spi transfer failed, But the cache is updated, So if I use
regmap_read will get the cache data which is not the real register value.

Signed-off-by: Elaine Zhang <zhangqing@rock-chips.com>
Signed-off-by: Mark Brown <broonie@kernel.org>