Unverified Commit 78908f45 authored by Mark Brown's avatar Mark Brown
Browse files

regmap: Let users check if a register is cached 



The HDA driver has a use case for checking if a register is cached which
it bodges in awkwardly and unclearly. Provide an API which allows it to
directly do what it's trying to do.

Reviewed-by: default avatarTakashi Iwai <tiwai@suse.de>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20230717-regmap-cache-check-v1-1-73ef688afae3@kernel.org


Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 47ee108a

drivers/base/regmap/regcache.c

+23 −0
Original line number Diff line number Diff line
@@ -561,6 +561,29 @@ void regcache_cache_bypass(struct regmap *map, bool enable) 
}

EXPORT_SYMBOL_GPL(regcache_cache_bypass);



/**

 * regcache_reg_cached - Check if a register is cached

 *

 * @map: map to check

 * @reg: register to check

 *

 * Reports if a register is cached.

 */

bool regcache_reg_cached(struct regmap *map, unsigned int reg)

{

	unsigned int val;

	int ret;



	map->lock(map->lock_arg);



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



	map->unlock(map->lock_arg);



	return ret == 0;

}

EXPORT_SYMBOL_GPL(regcache_reg_cached);



void regcache_set_val(struct regmap *map, void *base, unsigned int idx,

		      unsigned int val)

{

include/linux/regmap.h

+1 −0
Original line number Diff line number Diff line
@@ -1287,6 +1287,7 @@ int regcache_drop_region(struct regmap *map, unsigned int min, 
void regcache_cache_only(struct regmap *map, bool enable);

void regcache_cache_bypass(struct regmap *map, bool enable);

void regcache_mark_dirty(struct regmap *map);

bool regcache_reg_cached(struct regmap *map, unsigned int reg);



bool regmap_check_range_table(struct regmap *map, unsigned int reg,

			      const struct regmap_access_table *table);