diff options
| author | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2012-05-01 00:25:05 +0400 |
|---|---|---|
| committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2012-05-01 01:57:10 +0400 |
| commit | f298536728d02c19f11bda8d712ff61d767bab32 (patch) | |
| tree | 7666d562d16a143a9549d0a6feb66b558e22fcbb /drivers | |
| parent | d939fb9a78b4743bc4bc3cc415894ed42050c5cc (diff) | |
| download | linux-f298536728d02c19f11bda8d712ff61d767bab32.tar.xz | |
regmap: Cache single values read from the chip
If we don't have a cached value for a register and we can cache it then
when we do a read a value we should add it to the cache to save rereading
it later on. Do this for single register reads, for block reads the code
would be a little more complex and this covers most practical usage.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/base/regmap/regmap.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c index 178989a8949e..3e551223f4df 100644 --- a/drivers/base/regmap/regmap.c +++ b/drivers/base/regmap/regmap.c @@ -698,6 +698,9 @@ static int _regmap_read(struct regmap *map, unsigned int reg, trace_regmap_reg_read(map->dev, reg, *val); } + if (ret == 0 && !map->cache_bypass) + regcache_write(map, reg, *val); + return ret; } |