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| author | Mark Brown <broonie@kernel.org> | 2023-07-17 23:33:03 +0300 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2023-07-18 17:05:10 +0300 |
| commit | 78908f45ccf1dc2f4d5fb395c460fdbbf7e9ac3a (patch) | |
| tree | 04ce7a229dff553ea8aa785e0282bf4020f66c5c /drivers/base/regmap | |
| parent | 47ee108a113c72ec8ceee2c7af52c19ed72e6ad7 (diff) | |
| download | linux-78908f45ccf1dc2f4d5fb395c460fdbbf7e9ac3a.tar.xz | |
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: 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>
Diffstat (limited to 'drivers/base/regmap')
| -rw-r--r-- | drivers/base/regmap/regcache.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/drivers/base/regmap/regcache.c b/drivers/base/regmap/regcache.c index 156490ab7f34..8accf6292fe1 100644 --- a/drivers/base/regmap/regcache.c +++ b/drivers/base/regmap/regcache.c @@ -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) { |