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Subject[PATCH AUTOSEL 4.4 28/53] regmap: fix bulk writes on paged registers
Date
From: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>

[ Upstream commit db057679de3e9e6a03c1bcd5aee09b0d25fd9f5b ]

On buses like SlimBus and SoundWire which does not support
gather_writes yet in regmap, A bulk write on paged register
would be silently ignored after programming page.
This is because local variable 'ret' value in regmap_raw_write_impl()
gets reset to 0 once page register is written successfully and the
code below checks for 'ret' value to be -ENOTSUPP before linearising
the write buffer to send to bus->write().

Fix this by resetting the 'ret' value to -ENOTSUPP in cases where
gather_writes() is not supported or single register write is
not possible.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/base/regmap/regmap.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index fd377b956199..77cabde977ed 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -1358,6 +1358,8 @@ int _regmap_raw_write(struct regmap *map, unsigned int reg,
map->format.reg_bytes +
map->format.pad_bytes,
val, val_len);
+ else
+ ret = -ENOTSUPP;

/* If that didn't work fall back on linearising by hand. */
if (ret == -ENOTSUPP) {
--
2.20.1
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