regmap: fix bulk writes on paged registers

Message ID 20190612110343.4463-1-srinivas.kandagatla@linaro.org
State Accepted
Commit db057679de3e9e6a03c1bcd5aee09b0d25fd9f5b
Headers show
Series
  • regmap: fix bulk writes on paged registers
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Commit Message

Srinivas Kandagatla June 12, 2019, 11:03 a.m.
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>

---
 drivers/base/regmap/regmap.c | 2 ++
 1 file changed, 2 insertions(+)

-- 
2.21.0

Patch

diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index f1025452bb39..19f57ccfbe1d 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -1637,6 +1637,8 @@  static int _regmap_raw_write_impl(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) {