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

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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>
This commit is contained in:
Lars-Peter Clausen 2011-11-16 16:28:19 +01:00 • committed by Mark Brown
parent 720e4616e8
commit 19254411db
1 changed files with 3 additions and 3 deletions
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6
drivers/base/regmap/regmap.c
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@ -434,15 +434,15 @@ static int _regmap_read(struct regmap *map, unsigned int reg,
{ {
int ret; int ret;
if (!map->format.parse_val)
return -EINVAL;
if (!map->cache_bypass) { if (!map->cache_bypass) {
ret = regcache_read(map, reg, val); ret = regcache_read(map, reg, val);
if (ret == 0) if (ret == 0)
return 0; return 0;
} }
if (!map->format.parse_val)
return -EINVAL;
if (map->cache_only) if (map->cache_only)
return -EBUSY; return -EBUSY;