linux-kernel - Applied "regmap: fix bulk writes on paged registers" to the regmap tree

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Date:   Wed, 12 Jun 2019 16:59:36 +0100 (BST)
From:   Mark Brown <broonie@...nel.org>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:     alsa-devel@...a-project.org, broonie@...nel.org,
        gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
        Mark Brown <broonie@...nel.org>
Subject: Applied "regmap: fix bulk writes on paged registers" to the regmap tree

The patch

   regmap: fix bulk writes on paged registers

has been applied to the regmap tree at

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap.git for-5.2

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From db057679de3e9e6a03c1bcd5aee09b0d25fd9f5b Mon Sep 17 00:00:00 2001
From: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Date: Wed, 12 Jun 2019 12:03:43 +0100
Subject: [PATCH] regmap: fix bulk writes on paged registers

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@...aro.org>
Signed-off-by: Mark Brown <broonie@...nel.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 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) {
-- 
2.20.1