When writing a 3MB buffer the unwritable check in _regmap_raw_write_impl()
adds a ~20ms overhead on a Raspberry Pi 4.
Amend this by avoiding the check if it's not necessary.
Signed-off-by: Noralf Trønnes <noralf@xxxxxxxxxxx>
---
drivers/base/regmap/regmap.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index 19f57ccfbe1d..cd876309a74b 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -1489,10 +1489,12 @@ static int _regmap_raw_write_impl(struct regmap *map, unsigned int reg,
WARN_ON(!map->bus);
/* Check for unwritable registers before we start */
- for (i = 0; i < val_len / map->format.val_bytes; i++)
- if (!regmap_writeable(map,
- reg + regmap_get_offset(map, i)))
- return -EINVAL;
+ if (map->max_register || map->writeable_reg || map->wr_table) {
+ for (i = 0; i < val_len / map->format.val_bytes; i++)
+ if (!regmap_writeable(map,
+ reg + regmap_get_offset(map, i)))
+ return -EINVAL;
+ }
if (!map->cache_bypass && map->format.parse_val) {
unsigned int ival;
--
2.23.0
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