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ASoC: wm8741: Set OSR mode in hw_params() 

For correct operation of the digital filtering and other processing on the
WM8741, the user must ensure the correct value of OSR[1:0] is set at all
times.[1] Hence, depending the selected sampling rate, set the OSR (over-
sampling rate) mode in hw_params().

References:
	[1] "WM8741 Data Sheet"

Signed-off-by: Sergej Sawazki <sergej@taudac.com>
Acked-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Sergej Sawazki 2019-02-10 16:29:29 +01:00 committed by Mark Brown
parent 36b1599340
commit e9418629e2
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 11 additions and 1 deletions
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12
sound/soc/codecs/wm8741.c
View File

@ -196,7 +196,7 @@ static int wm8741_hw_params(struct snd_pcm_substream *substream,
{
struct snd_soc_component *component = dai->component;
struct wm8741_priv *wm8741 = snd_soc_component_get_drvdata(component);
unsigned int iface;
unsigned int iface, mode;
int i;
/* The set of sample rates that can be supported depends on the
@ -240,11 +240,21 @@ static int wm8741_hw_params(struct snd_pcm_substream *substream,
return -EINVAL;
}
/* oversampling rate */
if (params_rate(params) > 96000)
mode = 0x40;
else if (params_rate(params) > 48000)
mode = 0x20;
else
mode = 0x00;
dev_dbg(component->dev, "wm8741_hw_params: bit size param = %d, rate param = %d",
params_width(params), params_rate(params));
snd_soc_component_update_bits(component, WM8741_FORMAT_CONTROL, WM8741_IWL_MASK,
iface);
snd_soc_component_update_bits(component, WM8741_MODE_CONTROL_1, WM8741_OSR_MASK,
mode);
return 0;
}