diff options
| author | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2012-02-23 20:11:58 +0000 |
|---|---|---|
| committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2012-02-23 20:12:49 +0000 |
| commit | a3c3774176838bbfa4f6e48133644903818e56dc (patch) | |
| tree | a6398d371a2ee8c7b8e5854d3b04370ff404bcc9 | |
| parent | f0c2319f9f196726ebe4d7508fd8fbd804988db3 (diff) | |
regmap: Skip hardware defaults for LZO caches
Saves some I/O when resyncing; we assume that syncs start from the device
reset state.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
| -rw-r--r-- | drivers/base/regmap/regcache-lzo.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/base/regmap/regcache-lzo.c b/drivers/base/regmap/regcache-lzo.c index b7d16143ede..3025cf920f2 100644 --- a/drivers/base/regmap/regcache-lzo.c +++ b/drivers/base/regmap/regcache-lzo.c @@ -343,6 +343,12 @@ static int regcache_lzo_sync(struct regmap *map) ret = regcache_read(map, i, &val); if (ret) return ret; + + /* Is this the hardware default? If so skip. */ + ret = regcache_lookup_reg(map, i); + if (ret > 0 && val == map->reg_defaults[ret].def) + continue; + map->cache_bypass = 1; ret = _regmap_write(map, i, val); map->cache_bypass = 0; |