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regmap: Just send the buffer directly for single register writes
When doing a single register write we use work_buf for both the register and the value with the buffer formatted for sending directly to the device so we can just do a write() directly. This saves allocating a temporary buffer if we can't do gather writes and is likely to be faster than doing a gather write. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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1 changed files with 9 additions and 3 deletions
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@ -202,13 +202,19 @@ static int _regmap_raw_write(struct regmap *map, unsigned int reg,
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map->format.format_reg(map->work_buf, reg);
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/* Try to do a gather write if we can */
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if (map->bus->gather_write)
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/* If we're doing a single register write we can probably just
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* send the work_buf directly, otherwise try to do a gather
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* write.
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*/
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if (val == map->work_buf + map->format.reg_bytes)
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ret = map->bus->write(map->dev, map->work_buf,
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map->format.reg_bytes + val_len);
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else if (map->bus->gather_write)
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ret = map->bus->gather_write(map->dev, map->work_buf,
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map->format.reg_bytes,
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val, val_len);
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/* Otherwise fall back on linearising by hand. */
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/* If that didn't work fall back on linearising by hand. */
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if (ret == -ENOTSUPP) {
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len = map->format.reg_bytes + val_len;
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buf = kmalloc(len, GFP_KERNEL);
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