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.
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
---
drivers/base/regmap/regcache.c | 23 +++++++++++++++++++++++
include/linux/regmap.h | 1 +
2 files changed, 24 insertions(+)
diff --git a/drivers/base/regmap/regcache.c b/drivers/base/regmap/regcache.c
index 28bc3ae9458a..4d25a906b688 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)
{
diff --git a/include/linux/regmap.h b/include/linux/regmap.h
index 8fc0b3ebce44..c9182a47736e 100644
--- a/include/linux/regmap.h
+++ b/include/linux/regmap.h
@@ -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);
--
2.39.2
