From: Srinivas Kandagatla Date: Wed, 12 Jun 2019 11:03:43 +0000 (+0100) Subject: regmap: fix bulk writes on paged registers X-Git-Tag: v4.19.61~209 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=b01bf44c363dac31128c8a4ac15a740dcb6513cf;p=platform%2Fkernel%2Flinux-rpi.git regmap: fix bulk writes on paged registers [ 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 Signed-off-by: Mark Brown Signed-off-by: Sasha Levin --- diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c index 0360a90..6c9f698 100644 --- a/drivers/base/regmap/regmap.c +++ b/drivers/base/regmap/regmap.c @@ -1618,6 +1618,8 @@ 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) {