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regmap: Add trace event for successful cache reads

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Currently we only trace physical reads, there's no instrumentation if
the read is satisfied from cache.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Mark Brown
2011-11-30 14:27:08 +00:00
parent 018690d33e
commit bc7ee55633
2 changed files with 19 additions and 2 deletions
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12
drivers/base/regmap/regcache.c
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@@ -193,13 +193,21 @@ void regcache_exit(struct regmap *map)
int regcache_read(struct regmap *map,
unsigned int reg, unsigned int *value)
{
int ret;
if (map->cache_type == REGCACHE_NONE)
return -ENOSYS;
BUG_ON(!map->cache_ops);
if (!regmap_volatile(map, reg))
return map->cache_ops->read(map, reg, value);
if (!regmap_volatile(map, reg)) {
ret = map->cache_ops->read(map, reg, value);
if (ret == 0)
trace_regmap_reg_read_cache(map->dev, reg, *value);
return ret;
}
return -EINVAL;
}