diff options
| author | Stephen Warren <swarren@nvidia.com> | 2012-04-05 01:48:28 +0400 |
|---|---|---|
| committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2012-04-06 13:47:34 +0400 |
| commit | bacdbe077342ecc9e7b3e374cc5a41995116706a (patch) | |
| tree | b5cf9547a0ab4a7fba287a3d654d132869057afa /drivers/base/regmap/regcache.c | |
| parent | 0135bbcc7a0cc056f0203ff839466236b8e3dc19 (diff) | |
| download | linux-bacdbe077342ecc9e7b3e374cc5a41995116706a.tar.xz | |
regmap: introduce fast_io busses, and use a spinlock for them
Some bus types have very fast IO. For these, acquiring a mutex for every
IO operation is a significant overhead. Allow busses to indicate their IO
is fast, and enhance regmap to use a spinlock for those busses.
[Currently limited to native endian registers -- broonie]
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'drivers/base/regmap/regcache.c')
| -rw-r--r-- | drivers/base/regmap/regcache.c | 20 |
1 files changed, 10 insertions, 10 deletions
diff --git a/drivers/base/regmap/regcache.c b/drivers/base/regmap/regcache.c index 87f54dbf601b..4ad18505e9ae 100644 --- a/drivers/base/regmap/regcache.c +++ b/drivers/base/regmap/regcache.c @@ -264,7 +264,7 @@ int regcache_sync(struct regmap *map) BUG_ON(!map->cache_ops || !map->cache_ops->sync); - mutex_lock(&map->lock); + map->lock(map); /* Remember the initial bypass state */ bypass = map->cache_bypass; dev_dbg(map->dev, "Syncing %s cache\n", @@ -296,7 +296,7 @@ out: trace_regcache_sync(map->dev, name, "stop"); /* Restore the bypass state */ map->cache_bypass = bypass; - mutex_unlock(&map->lock); + map->unlock(map); return ret; } @@ -323,7 +323,7 @@ int regcache_sync_region(struct regmap *map, unsigned int min, BUG_ON(!map->cache_ops || !map->cache_ops->sync); - mutex_lock(&map->lock); + map->lock(map); /* Remember the initial bypass state */ bypass = map->cache_bypass; @@ -342,7 +342,7 @@ out: trace_regcache_sync(map->dev, name, "stop region"); /* Restore the bypass state */ map->cache_bypass = bypass; - mutex_unlock(&map->lock); + map->unlock(map); return ret; } @@ -361,11 +361,11 @@ out: */ void regcache_cache_only(struct regmap *map, bool enable) { - mutex_lock(&map->lock); + map->lock(map); WARN_ON(map->cache_bypass && enable); map->cache_only = enable; trace_regmap_cache_only(map->dev, enable); - mutex_unlock(&map->lock); + map->unlock(map); } EXPORT_SYMBOL_GPL(regcache_cache_only); @@ -380,9 +380,9 @@ EXPORT_SYMBOL_GPL(regcache_cache_only); */ void regcache_mark_dirty(struct regmap *map) { - mutex_lock(&map->lock); + map->lock(map); map->cache_dirty = true; - mutex_unlock(&map->lock); + map->unlock(map); } EXPORT_SYMBOL_GPL(regcache_mark_dirty); @@ -399,11 +399,11 @@ EXPORT_SYMBOL_GPL(regcache_mark_dirty); */ void regcache_cache_bypass(struct regmap *map, bool enable) { - mutex_lock(&map->lock); + map->lock(map); WARN_ON(map->cache_only && enable); map->cache_bypass = enable; trace_regmap_cache_bypass(map->dev, enable); - mutex_unlock(&map->lock); + map->unlock(map); } EXPORT_SYMBOL_GPL(regcache_cache_bypass); |