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Commit affbe886 authored by Mark Brown's avatar Mark Brown
Browse files

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: default avatarMark Brown <broonie@linaro.org>
parent 1a25f261

drivers/base/regmap/regcache.c

+14 −2
Original line number Diff line number Diff line
@@ -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);