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ASoC: wm8741: Allow master clock switching

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The set of supported sample rates depends on the master clock supplied
to the codec. Allow the machine driver to set the required master clock
in hw_params().

Signed-off-by: Sergej Sawazki <ce3a@gmx.de>
Acked-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Sergej Sawazki 2015-06-06 11:25:48 +02:00 committed by Mark Brown
parent 2d52d17239
commit e369bd006f
1 changed files with 26 additions and 35 deletions
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55
sound/soc/codecs/wm8741.c
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@ -125,18 +125,6 @@ static const struct snd_soc_dapm_route wm8741_dapm_routes[] = {
{ "VOUTRN", NULL, "DACR" },
};
static struct {
int value;
int ratio;
} lrclk_ratios[WM8741_NUM_RATES] = {
{ 1, 128 },
{ 2, 192 },
{ 3, 256 },
{ 4, 384 },
{ 5, 512 },
{ 6, 768 },
};
static const unsigned int rates_11289[] = {
44100, 88200,
};
@ -209,22 +197,13 @@ static const struct snd_pcm_hw_constraint_list constraints_36864 = {
.list = rates_36864,
};
static int wm8741_startup(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct snd_soc_codec *codec = dai->codec;
struct wm8741_priv *wm8741 = snd_soc_codec_get_drvdata(codec);
/* The set of sample rates that can be supported depends on the
* MCLK supplied to the CODEC - enforce this.
*/
if (!wm8741->sysclk) {
dev_err(codec->dev,
"No MCLK configured, call set_sysclk() on init\n");
return -EINVAL;
}
if (wm8741->sysclk)
snd_pcm_hw_constraint_list(substream->runtime, 0,
SNDRV_PCM_HW_PARAM_RATE,
wm8741->sysclk_constraints);
@ -241,17 +220,24 @@ static int wm8741_hw_params(struct snd_pcm_substream *substream,
u16 iface = snd_soc_read(codec, WM8741_FORMAT_CONTROL) & 0x1FC;
int i;
/* Find a supported LRCLK ratio */
for (i = 0; i < ARRAY_SIZE(lrclk_ratios); i++) {
if (wm8741->sysclk / params_rate(params) ==
lrclk_ratios[i].ratio)
/* The set of sample rates that can be supported depends on the
* MCLK supplied to the CODEC - enforce this.
*/
if (!wm8741->sysclk) {
dev_err(codec->dev,
"No MCLK configured, call set_sysclk() on init or in hw_params\n");
return -EINVAL;
}
/* Find a supported LRCLK rate */
for (i = 0; i < wm8741->sysclk_constraints->count; i++) {
if (wm8741->sysclk_constraints->list[i] == params_rate(params))
break;
}
/* Should never happen, should be handled by constraints */
if (i == ARRAY_SIZE(lrclk_ratios)) {
dev_err(codec->dev, "MCLK/fs ratio %d unsupported\n",
wm8741->sysclk / params_rate(params));
if (i == wm8741->sysclk_constraints->count) {
dev_err(codec->dev, "LRCLK %d unsupported with MCLK %d\n",
params_rate(params), wm8741->sysclk);
return -EINVAL;
}
@ -274,8 +260,8 @@ static int wm8741_hw_params(struct snd_pcm_substream *substream,
return -EINVAL;
}
dev_dbg(codec->dev, "wm8741_hw_params: bit size param = %d",
params_width(params));
dev_dbg(codec->dev, "wm8741_hw_params: bit size param = %d, rate param = %d",
params_width(params), params_rate(params));
snd_soc_write(codec, WM8741_FORMAT_CONTROL, iface);
return 0;
@ -290,6 +276,11 @@ static int wm8741_set_dai_sysclk(struct snd_soc_dai *codec_dai,
dev_dbg(codec->dev, "wm8741_set_dai_sysclk info: freq=%dHz\n", freq);
switch (freq) {
case 0:
wm8741->sysclk_constraints = NULL;
wm8741->sysclk = freq;
return 0;
case 11289600:
wm8741->sysclk_constraints = &constraints_11289;
wm8741->sysclk = freq;