xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

regmap: core: Introduce register stride order

Browse Source 
Since the register stride should always equal to 2^N, and bit rotation is
much faster than multiplication and division. So introducing the stride
order and using bit rotation to get the offset of the register from the
index to improve the performance.

Signed-off-by: Xiubo Li <lixiubo@cmss.chinamobile.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Xiubo Li
2016-01-04 18:00:33 +08:00
committed by Mark Brown
parent 92e963f50f
commit ca747be22f
2 changed files with 23 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/base/regmap/internal.h
View File

@@ -110,6 +110,7 @@ struct regmap {
/* number of bits to (left) shift the reg value when formatting*/
int reg_shift;
int reg_stride;
int reg_stride_order;
/* regcache specific members */
const struct regcache_ops *cache_ops;
@@ -263,4 +264,13 @@ static inline const char *regmap_name(const struct regmap *map)
return map->name;
}
static inline unsigned int regmap_get_offset(const struct regmap *map,
unsigned int index)
{
if (map->reg_stride_order >= 0)
return index << map->reg_stride_order;
else
return index * map->reg_stride;
}
#endif