From: Mark Brown <broonie@opensource.wolfsonmicro.com>
To: Liam Girdwood <lrg@ti.com>
Cc: alsa-devel@alsa-project.org, patches@opensource.wolfsonmicro.com,
Mark Brown <broonie@opensource.wolfsonmicro.com>
Subject: [PATCH] ASoC: Disable register synchronisation for low frequency WM8996 SYSCLK
Date: Thu, 19 Jan 2012 12:00:24 +0000 [thread overview]
Message-ID: <1326974424-29233-1-git-send-email-broonie@opensource.wolfsonmicro.com> (raw)
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 <broonie@opensource.wolfsonmicro.com>
---
sound/soc/codecs/wm8996.c | 4 ++++
sound/soc/codecs/wm8996.h | 4 ++++
2 files changed, 8 insertions(+), 0 deletions(-)
diff --git a/sound/soc/codecs/wm8996.c b/sound/soc/codecs/wm8996.c
index 691ae4e..8e8f8d1 100644
--- a/sound/soc/codecs/wm8996.c
+++ b/sound/soc/codecs/wm8996.c
@@ -2007,6 +2007,7 @@ static int wm8996_set_sysclk(struct snd_soc_dai *dai,
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;
@@ -2051,6 +2052,7 @@ static int wm8996_set_sysclk(struct snd_soc_dai *dai,
case 32000:
case 32768:
lfclk = WM8996_LFCLK_ENA;
+ sync = 0;
break;
default:
dev_warn(codec->dev, "Unsupported clock rate %dHz\n",
@@ -2064,6 +2066,8 @@ static int wm8996_set_sysclk(struct snd_soc_dai *dai,
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);
diff --git a/sound/soc/codecs/wm8996.h b/sound/soc/codecs/wm8996.h
index 0fde643..de9ac3e 100644
--- a/sound/soc/codecs/wm8996.h
+++ b/sound/soc/codecs/wm8996.h
@@ -1567,6 +1567,10 @@ int wm8996_detect(struct snd_soc_codec *codec, struct snd_soc_jack *jack,
/*
* 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 */
--
1.7.7.3
reply other threads:[~2012-01-19 12:00 UTC|newest]
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