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Commit 21002e20 authored by Mark Brown's avatar Mark Brown
Browse files

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: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
parent 9e79261f

sound/soc/codecs/wm8900.c

+12 −1
Original line number Diff line number Diff line
@@ -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;

}