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-rw-r--r--drivers/base/regmap/internal.h2
-rw-r--r--drivers/base/regmap/regmap.c29
-rw-r--r--include/linux/regmap.h3
3 files changed, 23 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;
diff --git a/include/linux/regmap.h b/include/linux/regmap.h
index f36c9f96d32d..413e5ccce759 100644
--- a/include/linux/regmap.h
+++ b/include/linux/regmap.h
@@ -296,6 +296,8 @@ typedef int (*regmap_hw_reg_read)(void *context, unsigned int reg,
unsigned int *val);
typedef int (*regmap_hw_reg_write)(void *context, unsigned int reg,
unsigned int val);
+typedef int (*regmap_hw_reg_update_bits)(void *context, unsigned int reg,
+ unsigned int mask, unsigned int val);
typedef struct regmap_async *(*regmap_hw_async_alloc)(void);
typedef void (*regmap_hw_free_context)(void *context);
@@ -335,6 +337,7 @@ struct regmap_bus {
regmap_hw_gather_write gather_write;
regmap_hw_async_write async_write;
regmap_hw_reg_write reg_write;
+ regmap_hw_reg_update_bits reg_update_bits;
regmap_hw_read read;
regmap_hw_reg_read reg_read;
regmap_hw_free_context free_context;