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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>
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@ -1474,6 +1474,8 @@ int _regmap_raw_write(struct regmap *map, unsigned int reg,
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ret = map->bus->write(map->bus_context, buf, len);
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kfree(buf);
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} else if (ret != 0 && !map->cache_bypass && map->format.parse_val) {
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regcache_drop_region(map, reg, reg + 1);
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}
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trace_regmap_hw_write_done(map, reg, val_len / map->format.val_bytes);
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