This is a note to let you know that I've just added the patch titled
ASoC: ssm4567: Reset device before regcache_sync()
to the 4.5-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
asoc-ssm4567-reset-device-before-regcache_sync.patch
and it can be found in the queue-4.5 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 712a8038cc24dba668afe82f0413714ca87184e0 Mon Sep 17 00:00:00 2001
From: Lars-Peter Clausen <lars@xxxxxxxxxx>
Date: Wed, 27 Jan 2016 14:26:18 +0100
Subject: ASoC: ssm4567: Reset device before regcache_sync()
From: Lars-Peter Clausen <lars@xxxxxxxxxx>
commit 712a8038cc24dba668afe82f0413714ca87184e0 upstream.
When the ssm4567 is powered up the driver calles regcache_sync() to restore
the register map content. regcache_sync() assumes that the device is in its
power-on reset state. Make sure that this is the case by explicitly
resetting the ssm4567 register map before calling regcache_sync() otherwise
we might end up with a incorrect register map which leads to undefined
behaviour.
One such undefined behaviour was observed when returning from system
suspend while a playback stream is active, in that case the ssm4567 was
kept muted after resume.
Fixes: 1ee44ce03011 ("ASoC: ssm4567: Add driver for Analog Devices SSM4567 amplifier")
Reported-by: Harsha Priya <harshapriya.n@xxxxxxxxx>
Tested-by: Fang, Yang A <yang.a.fang@xxxxxxxxx>
Signed-off-by: Lars-Peter Clausen <lars@xxxxxxxxxx>
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
sound/soc/codecs/ssm4567.c | 5 +++++
1 file changed, 5 insertions(+)
--- a/sound/soc/codecs/ssm4567.c
+++ b/sound/soc/codecs/ssm4567.c
@@ -352,6 +352,11 @@ static int ssm4567_set_power(struct ssm4
regcache_cache_only(ssm4567->regmap, !enable);
if (enable) {
+ ret = regmap_write(ssm4567->regmap, SSM4567_REG_SOFT_RESET,
+ 0x00);
+ if (ret)
+ return ret;
+
ret = regmap_update_bits(ssm4567->regmap,
SSM4567_REG_POWER_CTRL,
SSM4567_POWER_SPWDN, 0x00);
Patches currently in stable-queue which might be from lars@xxxxxxxxxx are
queue-4.5/usb-gadget-f_fs-fix-use-after-free.patch
queue-4.5/asoc-ssm4567-reset-device-before-regcache_sync.patch
queue-4.5/asoc-dapm-make-sure-we-have-a-card-when-displaying-component-widgets.patch
--
To unsubscribe from this list: send the line "unsubscribe stable" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html