This is a note to let you know that I've just added the patch titled
ASoC: Disable register synchronisation for low frequency WM8996 SYSCLK
to the 3.2-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-disable-register-synchronisation-for-low-frequency-wm8996-sysclk.patch
and it can be found in the queue-3.2 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From fed22007113cb857e917913ce016d9b539dc3a80 Mon Sep 17 00:00:00 2001
From: Mark Brown <[email protected]>
Date: Wed, 18 Jan 2012 19:17:06 +0000
Subject: ASoC: Disable register synchronisation for low frequency WM8996 SYSCLK
From: Mark Brown <[email protected]>
commit fed22007113cb857e917913ce016d9b539dc3a80 upstream.
With a low frequency SYSCLK and a fast I2C clock register synchronisation
may occasionally take too long to take effect, causing I/O issues. Disable
synchronisation in order to avoid any issues.
Signed-off-by: Mark Brown <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
sound/soc/codecs/wm8996.c | 4 ++++
sound/soc/codecs/wm8996.h | 4 ++++
2 files changed, 8 insertions(+)
--- a/sound/soc/codecs/wm8996.c
+++ b/sound/soc/codecs/wm8996.c
@@ -1932,6 +1932,7 @@ static int wm8996_set_sysclk(struct snd_
struct wm8996_priv *wm8996 = snd_soc_codec_get_drvdata(codec);
int lfclk = 0;
int ratediv = 0;
+ int sync = WM8996_REG_SYNC;
int src;
int old;
@@ -1976,6 +1977,7 @@ static int wm8996_set_sysclk(struct snd_
case 32000:
case 32768:
lfclk = WM8996_LFCLK_ENA;
+ sync = 0;
break;
default:
dev_warn(codec->dev, "Unsupported clock rate %dHz\n",
@@ -1989,6 +1991,8 @@ static int wm8996_set_sysclk(struct snd_
WM8996_SYSCLK_SRC_MASK | WM8996_SYSCLK_DIV_MASK,
src << WM8996_SYSCLK_SRC_SHIFT | ratediv);
snd_soc_update_bits(codec, WM8996_CLOCKING_1, WM8996_LFCLK_ENA, lfclk);
+ snd_soc_update_bits(codec, WM8996_CONTROL_INTERFACE_1,
+ WM8996_REG_SYNC, sync);
snd_soc_update_bits(codec, WM8996_AIF_CLOCKING_1,
WM8996_SYSCLK_ENA, old);
--- a/sound/soc/codecs/wm8996.h
+++ b/sound/soc/codecs/wm8996.h
@@ -1567,6 +1567,10 @@ int wm8996_detect(struct snd_soc_codec *
/*
* R257 (0x101) - Control Interface (1)
*/
+#define WM8996_REG_SYNC 0x8000 /* REG_SYNC */
+#define WM8996_REG_SYNC_MASK 0x8000 /* REG_SYNC */
+#define WM8996_REG_SYNC_SHIFT 15 /* REG_SYNC */
+#define WM8996_REG_SYNC_WIDTH 1 /* REG_SYNC */
#define WM8996_AUTO_INC 0x0004 /* AUTO_INC */
#define WM8996_AUTO_INC_MASK 0x0004 /* AUTO_INC */
#define WM8996_AUTO_INC_SHIFT 2 /* AUTO_INC */
Patches currently in stable-queue which might be from
[email protected] are
queue-3.2/asoc-wm8996-call-_post_pmu-callback-for-cpvdd.patch
queue-3.2/asoc-disable-register-synchronisation-for-low-frequency-wm8996-sysclk.patch
queue-3.2/asoc-mark-wm5100-register-map-cache-only-when-going-into-bias_off.patch
queue-3.2/asoc-don-t-go-through-cache-when-applying-wm5100-rev-a-updates.patch
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