diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/base/regmap/internal.h | 2 | ||||
| -rw-r--r-- | drivers/base/regmap/regmap.c | 29 |
2 files changed, 20 insertions, 11 deletions
diff --git a/drivers/base/regmap/internal.h b/drivers/base/regmap/internal.h index cc557886ab23..628ad7ac078b 100644 --- a/drivers/base/regmap/internal.h +++ b/drivers/base/regmap/internal.h @@ -98,6 +98,8 @@ struct regmap { int (*reg_read)(void *context, unsigned int reg, unsigned int *val); int (*reg_write)(void *context, unsigned int reg, unsigned int val); + int (*reg_update_bits)(void *context, unsigned int reg, + unsigned int mask, unsigned int val); bool defer_caching; diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c index afaf56200674..8cd155af3d63 100644 --- a/drivers/base/regmap/regmap.c +++ b/drivers/base/regmap/regmap.c @@ -619,6 +619,7 @@ struct regmap *__regmap_init(struct device *dev, goto skip_format_initialization; } else { map->reg_read = _regmap_bus_read; + map->reg_update_bits = bus->reg_update_bits; } reg_endian = regmap_get_reg_endian(bus, config); @@ -2509,20 +2510,26 @@ static int _regmap_update_bits(struct regmap *map, unsigned int reg, int ret; unsigned int tmp, orig; - ret = _regmap_read(map, reg, &orig); - if (ret != 0) - return ret; + if (change) + *change = false; - tmp = orig & ~mask; - tmp |= val & mask; - - if (force_write || (tmp != orig)) { - ret = _regmap_write(map, reg, tmp); - if (change) + if (regmap_volatile(map, reg) && map->reg_update_bits) { + ret = map->reg_update_bits(map->bus_context, reg, mask, val); + if (ret == 0 && change) *change = true; } else { - if (change) - *change = false; + ret = _regmap_read(map, reg, &orig); + if (ret != 0) + return ret; + + tmp = orig & ~mask; + tmp |= val & mask; + + if (force_write || (tmp != orig)) { + ret = _regmap_write(map, reg, tmp); + if (ret == 0 && change) + *change = true; + } } return ret; |