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regmap: Skip hardware defaults for LZO caches

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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>
This commit is contained in:
Mark Brown 2012-02-23 20:11:58 +00:00
parent f0c2319f9f
commit a3c3774176
1 changed files with 6 additions and 0 deletions
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6
drivers/base/regmap/regcache-lzo.c
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@ -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;