regmap: Cache single values read from the chip
If we don't have a cached value for a register and we can cache it then
when we do a read a value we should add it to the cache to save rereading
it later on. Do this for single register reads, for block reads the code
would be a little more complex and this covers most practical usage.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index 178989a..3e55122 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -698,6 +698,9 @@
trace_regmap_reg_read(map->dev, reg, *val);
}
+ if (ret == 0 && !map->cache_bypass)
+ regcache_write(map, reg, *val);
+
return ret;
}