diff options
| author | Charles Keepax <ckeepax@opensource.cirrus.com> | 2018-02-22 15:59:13 +0300 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2018-02-26 14:00:33 +0300 |
| commit | 364e378b8d1679f91a29a9537a881bba17931cfb (patch) | |
| tree | fda07da45533fb24f7ec499fbcc29fc30ce7c2db /drivers/base | |
| parent | 7ef2c6b8689a084954cffbd102ee49c2fb72cbd4 (diff) | |
| download | linux-364e378b8d1679f91a29a9537a881bba17931cfb.tar.xz | |
regmap: Tidy up regmap_raw_write chunking code
Raw writes may need to be split into small chunks if max_raw_write is
set. Tidy up the code implementing this, the new code is slightly
clearer, slightly shorter and slightly more efficient.
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/base')
| -rw-r--r-- | drivers/base/regmap/regmap.c | 37 |
1 files changed, 16 insertions, 21 deletions
diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c index e82ea77849fb..bfdd66dd3766 100644 --- a/drivers/base/regmap/regmap.c +++ b/drivers/base/regmap/regmap.c @@ -1812,40 +1812,35 @@ int _regmap_raw_write(struct regmap *map, unsigned int reg, { size_t val_bytes = map->format.val_bytes; size_t val_count = val_len / val_bytes; - int chunk_stride = map->reg_stride; - size_t chunk_size = val_bytes; - size_t chunk_count = val_count; + size_t chunk_count, chunk_bytes; + size_t chunk_regs = val_count; int ret, i; if (!val_count) return -EINVAL; - if (!map->use_single_write) { - if (map->max_raw_write) - chunk_size = map->max_raw_write; - else - chunk_size = val_len; - if (chunk_size % val_bytes) - chunk_size -= chunk_size % val_bytes; - chunk_count = val_len / chunk_size; - chunk_stride *= chunk_size / val_bytes; - } + if (map->use_single_write) + chunk_regs = 1; + else if (map->max_raw_write && val_len > map->max_raw_write) + chunk_regs = map->max_raw_write / val_bytes; + + chunk_count = val_count / chunk_regs; + chunk_bytes = chunk_regs * val_bytes; /* Write as many bytes as possible with chunk_size */ for (i = 0; i < chunk_count; i++) { - ret = _regmap_raw_write_impl(map, - reg + (i * chunk_stride), - val + (i * chunk_size), - chunk_size); + ret = _regmap_raw_write_impl(map, reg, val, chunk_bytes); if (ret) return ret; + + reg += regmap_get_offset(map, chunk_regs); + val += chunk_bytes; + val_len -= chunk_bytes; } /* Write remaining bytes */ - if (!ret && chunk_size * i < val_len) - ret = _regmap_raw_write_impl(map, reg + (i * chunk_stride), - val + (i * chunk_size), - val_len - i * chunk_size); + if (val_len) + ret = _regmap_raw_write_impl(map, reg, val, val_len); return ret; } |