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authorMark Brown <broonie@opensource.wolfsonmicro.com>2009-06-12 17:27:52 +0100
committerMark Brown <broonie@opensource.wolfsonmicro.com>2009-06-13 20:06:23 +0100
commit21002e20767292d85701154cdf12a591b45f0979 (patch)
tree90eced50094a67382886b68dbbfda1ff92911226 /sound/soc/codecs/wm8900.c
parent9e79261f302083cbc6aa95e0f778e3583b1ab36e (diff)
ASoC: Automatically manage WM8900 sloping stopband filter
For best performance the DAC sloping stopband filter should be enabled below 24kHz and not enabled above that so remove the user visible control for this and do it autonomously in the driver. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'sound/soc/codecs/wm8900.c')
-rw-r--r--sound/soc/codecs/wm8900.c13
1 files changed, 12 insertions, 1 deletions
diff --git a/sound/soc/codecs/wm8900.c b/sound/soc/codecs/wm8900.c
index 3c78945244b..de99206a010 100644
--- a/sound/soc/codecs/wm8900.c
+++ b/sound/soc/codecs/wm8900.c
@@ -116,6 +116,7 @@
#define WM8900_REG_CLOCKING2_DAC_CLKDIV 0x1c
#define WM8900_REG_DACCTRL_MUTE 0x004
+#define WM8900_REG_DACCTRL_DAC_SB_FILT 0x100
#define WM8900_REG_DACCTRL_AIF_LRCLKRATE 0x400
#define WM8900_REG_AUDIO3_ADCLRC_DIR 0x0800
@@ -439,7 +440,6 @@ SOC_SINGLE("DAC Soft Mute Switch", WM8900_REG_DACCTRL, 6, 1, 1),
SOC_ENUM("DAC Mute Rate", dac_mute_rate),
SOC_SINGLE("DAC Mono Switch", WM8900_REG_DACCTRL, 9, 1, 0),
SOC_ENUM("DAC Deemphasis", dac_deemphasis),
-SOC_SINGLE("DAC Sloping Stopband Filter Switch", WM8900_REG_DACCTRL, 8, 1, 0),
SOC_SINGLE("DAC Sigma-Delta Modulator Clock Switch", WM8900_REG_DACCTRL,
12, 1, 0),
@@ -743,6 +743,17 @@ static int wm8900_hw_params(struct snd_pcm_substream *substream,
wm8900_write(codec, WM8900_REG_AUDIO1, reg);
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ reg = wm8900_read(codec, WM8900_REG_DACCTRL);
+
+ if (params_rate(params) <= 24000)
+ reg |= WM8900_REG_DACCTRL_DAC_SB_FILT;
+ else
+ reg &= ~WM8900_REG_DACCTRL_DAC_SB_FILT;
+
+ wm8900_write(codec, WM8900_REG_DACCTRL, reg);
+ }
+
return 0;
}