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regmap: Let users check if a register is cached

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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: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20230717-regmap-cache-check-v1-1-73ef688afae3@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Mark Brown 2023-07-17 21:33:03 +01:00
parent 47ee108a11
commit 78908f45cc
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2 changed files with 24 additions and 0 deletions
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23
drivers/base/regmap/regcache.c
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@ -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)
{

1
include/linux/regmap.h
View File

@ -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);