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regmap: Tidy up regmap_raw_read chunking code
Raw reads may need to be split into small chunks if max_raw_read 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>
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parent
0645ba4331
commit
1b079ca2c2
1 changed files with 19 additions and 25 deletions
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@ -2542,44 +2542,38 @@ int regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
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if (regmap_volatile_range(map, reg, val_count) || map->cache_bypass ||
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map->cache_type == REGCACHE_NONE) {
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int chunk_stride = map->reg_stride;
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size_t chunk_size = val_bytes;
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size_t chunk_count = val_count;
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size_t chunk_count, chunk_bytes;
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size_t chunk_regs = val_count;
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if (!map->bus->read) {
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ret = -ENOTSUPP;
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goto out;
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}
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if (!map->use_single_read) {
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if (map->max_raw_read)
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chunk_size = map->max_raw_read;
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else
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chunk_size = val_len;
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if (chunk_size % val_bytes)
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chunk_size -= chunk_size % val_bytes;
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chunk_count = val_len / chunk_size;
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chunk_stride *= chunk_size / val_bytes;
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}
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if (map->use_single_read)
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chunk_regs = 1;
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else if (map->max_raw_read && val_len > map->max_raw_read)
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chunk_regs = map->max_raw_read / val_bytes;
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/* Read bytes that fit into a multiple of chunk_size */
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chunk_count = val_count / chunk_regs;
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chunk_bytes = chunk_regs * val_bytes;
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/* Read bytes that fit into whole chunks */
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for (i = 0; i < chunk_count; i++) {
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ret = _regmap_raw_read(map,
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reg + (i * chunk_stride),
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val + (i * chunk_size),
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chunk_size);
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ret = _regmap_raw_read(map, reg, val, chunk_bytes);
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if (ret != 0)
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return ret;
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goto out;
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reg += regmap_get_offset(map, chunk_regs);
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val += chunk_bytes;
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val_len -= chunk_bytes;
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}
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/* Read remaining bytes */
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if (chunk_size * i < val_len) {
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ret = _regmap_raw_read(map,
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reg + (i * chunk_stride),
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val + (i * chunk_size),
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val_len - i * chunk_size);
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if (val_len) {
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ret = _regmap_raw_read(map, reg, val, val_len);
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if (ret != 0)
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return ret;
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goto out;
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}
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} else {
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/* Otherwise go word by word for the cache; should be low
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