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Commit d856fce4 authored by Maarten ter Huurne's avatar Maarten ter Huurne Committed by Mark Brown
Browse files

regmap: Implemented default cache sync operation 



This can be used for cache types for which syncing values one by one is
equally efficient as syncing a range, such as the flat cache.

Signed-off-by: default avatarMaarten ter Huurne <maarten@treewalker.org>
Signed-off-by: default avatarMark Brown <broonie@linaro.org>
parent 92ab1aab

drivers/base/regmap/regcache.c

+42 −4
Original line number Original line Diff line number Diff line
@@ -250,6 +250,38 @@ int regcache_write(struct regmap *map, 
	return 0;

	return 0;

}

}





static int regcache_default_sync(struct regmap *map, unsigned int min,

				 unsigned int max)

{

	unsigned int reg;



	for (reg = min; reg <= max; reg++) {

		unsigned int val;

		int ret;



		if (regmap_volatile(map, reg))

			continue;



		ret = regcache_read(map, reg, &val);

		if (ret)

			return ret;



		/* Is this the hardware default?  If so skip. */

		ret = regcache_lookup_reg(map, reg);

		if (ret >= 0 && val == map->reg_defaults[ret].def)

			continue;



		map->cache_bypass = 1;

		ret = _regmap_write(map, reg, val);

		map->cache_bypass = 0;

		if (ret)

			return ret;

		dev_dbg(map->dev, "Synced register %#x, value %#x\n", reg, val);

	}



	return 0;

}



/**

/**

 * regcache_sync: Sync the register cache with the hardware.

 * regcache_sync: Sync the register cache with the hardware.

 *

 *
@@ -268,7 +300,7 @@ int regcache_sync(struct regmap *map) 
	const char *name;

	const char *name;

	unsigned int bypass;

	unsigned int bypass;





	BUG_ON(!map->cache_ops || !map->cache_ops->sync);

	BUG_ON(!map->cache_ops);





	map->lock(map->lock_arg);

	map->lock(map->lock_arg);

	/* Remember the initial bypass state */

	/* Remember the initial bypass state */
@@ -297,7 +329,10 @@ int regcache_sync(struct regmap *map) 
	}

	}

	map->cache_bypass = 0;

	map->cache_bypass = 0;





	if (map->cache_ops->sync)

		ret = map->cache_ops->sync(map, 0, map->max_register);

		ret = map->cache_ops->sync(map, 0, map->max_register);

	else

		ret = regcache_default_sync(map, 0, map->max_register);





	if (ret == 0)

	if (ret == 0)

		map->cache_dirty = false;

		map->cache_dirty = false;
@@ -331,7 +366,7 @@ int regcache_sync_region(struct regmap *map, unsigned int min, 
	const char *name;

	const char *name;

	unsigned int bypass;

	unsigned int bypass;





	BUG_ON(!map->cache_ops || !map->cache_ops->sync);

	BUG_ON(!map->cache_ops);





	map->lock(map->lock_arg);

	map->lock(map->lock_arg);
@@ -346,7 +381,10 @@ int regcache_sync_region(struct regmap *map, unsigned int min, 
	if (!map->cache_dirty)

	if (!map->cache_dirty)

		goto out;

		goto out;





	if (map->cache_ops->sync)

		ret = map->cache_ops->sync(map, min, max);

		ret = map->cache_ops->sync(map, min, max);

	else

		ret = regcache_default_sync(map, min, max);





out:

out:

	trace_regcache_sync(map->dev, name, "stop region");

	trace_regcache_sync(map->dev, name, "stop region");