ASoC: Automatically manage WM8900 sloping stopband filter

[deliverable/linux.git] / sound / soc / codecs / wm8900.c

diff --git a/sound/soc/codecs/wm8900.c b/sound/soc/codecs/wm8900.c
index 3c78945244b8df516f12f0181f0194a4b1a1b949..de99206a01035a44b6f08d537dd8e7aa5dd5e0b7 100644 (file)
--- 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;
 }