regmap: Try cached read before checking if a hardware read is possible

For some register format types we do not provide a parse_val so we can not do a
hardware read. But a cached read is still possible, so try to read from the
cache first, before checking whether a hardware read is possible. Otherwise the
cache becomes pretty useless for these register types.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index 3cf4785c3afe..b96cf7202860 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -434,15 +434,15 @@ static int _regmap_read(struct regmap *map, unsigned int reg,
 {
         int ret;
 
-        if (!map->format.parse_val)
-                return -EINVAL;
-
         if (!map->cache_bypass) {
                 ret = regcache_read(map, reg, val);
                 if (ret == 0)
                         return 0;
         }
 
+        if (!map->format.parse_val)
+                return -EINVAL;
+
         if (map->cache_only)
                 return -EBUSY;