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regmap: Drop early readability check 

We have some drivers that have a use case for cached write only
registers, doing read/modify/writes on read only registers in order to
work more easily with bitfields.  Go back to trying the cache before we
check if we can read from the device.

Fixes: eab5abdeb7 ("regmap: Check for register readability before checking cache during read")
Reported-by: Konrad Dybcio <konradybcio@kernel.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20230615-regmap-drop-early-readability-v1-1-8135094362de@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Mark Brown 2023-06-16 00:04:40 +01:00
parent 505cb70cd2
commit 3e47b8877d
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 3 additions and 3 deletions
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6
drivers/base/regmap/regmap.c
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@ -2897,9 +2897,6 @@ static int _regmap_read(struct regmap *map, unsigned int reg,
int ret;
void *context = _regmap_map_get_context(map);
if (!regmap_readable(map, reg))
return -EIO;
if (!map->cache_bypass) {
ret = regcache_read(map, reg, val);
if (ret == 0)
@ -2909,6 +2906,9 @@ static int _regmap_read(struct regmap *map, unsigned int reg,
if (map->cache_only)
return -EBUSY;
if (!regmap_readable(map, reg))
return -EIO;
ret = map->reg_read(context, reg, val);
if (ret == 0) {
if (regmap_should_log(map))