diff options
author | Maarten ter Huurne <maarten@treewalker.org> | 2013-06-03 02:15:26 +0400 |
---|---|---|
committer | Mark Brown <broonie@linaro.org> | 2013-06-03 14:50:50 +0400 |
commit | d856fce41b74ecf2004d99f781e44abd7815d7f8 (patch) | |
tree | 3f0c545028c60409c87d2b6e39d3cd6a2bac24fa /drivers/base/regmap/regcache.c | |
parent | 92ab1aab59c61b3e05200b9aa0e05ab770059142 (diff) | |
download | linux-d856fce41b74ecf2004d99f781e44abd7815d7f8.tar.xz |
regmap: Implemented default cache sync operation
This can be used for cache types for which syncing values one by one is
equally efficient as syncing a range, such as the flat cache.
Signed-off-by: Maarten ter Huurne <maarten@treewalker.org>
Signed-off-by: Mark Brown <broonie@linaro.org>
Diffstat (limited to 'drivers/base/regmap/regcache.c')
-rw-r--r-- | drivers/base/regmap/regcache.c | 46 |
1 files changed, 42 insertions, 4 deletions
diff --git a/drivers/base/regmap/regcache.c b/drivers/base/regmap/regcache.c index 4bfa219ef37d..e69102696533 100644 --- a/drivers/base/regmap/regcache.c +++ b/drivers/base/regmap/regcache.c @@ -250,6 +250,38 @@ int regcache_write(struct regmap *map, return 0; } +static int regcache_default_sync(struct regmap *map, unsigned int min, + unsigned int max) +{ + unsigned int reg; + + for (reg = min; reg <= max; reg++) { + unsigned int val; + int ret; + + if (regmap_volatile(map, reg)) + continue; + + ret = regcache_read(map, reg, &val); + if (ret) + return ret; + + /* Is this the hardware default? If so skip. */ + ret = regcache_lookup_reg(map, reg); + if (ret >= 0 && val == map->reg_defaults[ret].def) + continue; + + map->cache_bypass = 1; + ret = _regmap_write(map, reg, val); + map->cache_bypass = 0; + if (ret) + return ret; + dev_dbg(map->dev, "Synced register %#x, value %#x\n", reg, val); + } + + return 0; +} + /** * regcache_sync: Sync the register cache with the hardware. * @@ -268,7 +300,7 @@ int regcache_sync(struct regmap *map) const char *name; unsigned int bypass; - BUG_ON(!map->cache_ops || !map->cache_ops->sync); + BUG_ON(!map->cache_ops); map->lock(map->lock_arg); /* Remember the initial bypass state */ @@ -297,7 +329,10 @@ int regcache_sync(struct regmap *map) } map->cache_bypass = 0; - ret = map->cache_ops->sync(map, 0, map->max_register); + if (map->cache_ops->sync) + ret = map->cache_ops->sync(map, 0, map->max_register); + else + ret = regcache_default_sync(map, 0, map->max_register); if (ret == 0) map->cache_dirty = false; @@ -331,7 +366,7 @@ int regcache_sync_region(struct regmap *map, unsigned int min, const char *name; unsigned int bypass; - BUG_ON(!map->cache_ops || !map->cache_ops->sync); + BUG_ON(!map->cache_ops); map->lock(map->lock_arg); @@ -346,7 +381,10 @@ int regcache_sync_region(struct regmap *map, unsigned int min, if (!map->cache_dirty) goto out; - ret = map->cache_ops->sync(map, min, max); + if (map->cache_ops->sync) + ret = map->cache_ops->sync(map, min, max); + else + ret = regcache_default_sync(map, min, max); out: trace_regcache_sync(map->dev, name, "stop region"); |