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regmap: Use async I/O during cache sync 

Try to speed up I/O a little by not synchronising until we are finished
scheduling writes. A brief survey of existing users suggests we have none
that would currently benefit from an async cache sync.

Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Mark Brown 2013-10-10 21:06:32 +01:00
parent 1a25f26138
commit affbe886e7
1 changed files with 14 additions and 2 deletions
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16
drivers/base/regmap/regcache.c
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@ -307,6 +307,8 @@ int regcache_sync(struct regmap *map)
if (!map->cache_dirty)
goto out;
map->async = true;
/* Apply any patch first */
map->cache_bypass = 1;
for (i = 0; i < map->patch_regs; i++) {
@ -332,11 +334,15 @@ int regcache_sync(struct regmap *map)
map->cache_dirty = false;
out:
trace_regcache_sync(map->dev, name, "stop");
/* Restore the bypass state */
map->async = false;
map->cache_bypass = bypass;
map->unlock(map->lock_arg);
regmap_async_complete(map);
trace_regcache_sync(map->dev, name, "stop");
return ret;
}
EXPORT_SYMBOL_GPL(regcache_sync);
@ -375,17 +381,23 @@ int regcache_sync_region(struct regmap *map, unsigned int min,
if (!map->cache_dirty)
goto out;
map->async = true;
if (map->cache_ops->sync)
ret = map->cache_ops->sync(map, min, max);
else
ret = regcache_default_sync(map, min, max);
out:
trace_regcache_sync(map->dev, name, "stop region");
/* Restore the bypass state */
map->cache_bypass = bypass;
map->async = false;
map->unlock(map->lock_arg);
regmap_async_complete(map);
trace_regcache_sync(map->dev, name, "stop region");
return ret;
}
EXPORT_SYMBOL_GPL(regcache_sync_region);