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MLK-19432-1: ASoC: imx-ak5558: limit max rate as function of sample bits 

According to AK5558 MCLK frequence must not exceed 36.864 MHz.
Limit maximum supported rate as function of max MCLK frequency,
sample bits and number of slots.

Signed-off-by: Viorel Suman <viorel.suman@nxp.com>
Reviewed-by: Shengjiu Wang <shengjiu.wang@nxp.com>
(cherry picked from commit 236796cad225daa39d5b77d763a1d964dd4de4c9)
This commit is contained in:
Viorel Suman 2018-09-04 13:25:12 +03:00 committed by Dong Aisheng
parent e49e74b10a
commit 4ac1d64047
2 changed files with 40 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
Documentation/devicetree/bindings/sound/imx-audio-ak5558.txt
View File

@ -2,7 +2,7 @@ Freescale i.MX audio complex with AK5558 ADC
Required properties:
- compatible : "fsl,imx-audio-ak5558"
- compatible : "fsl,imx-audio-ak5558", "fsl,imx-audio-ak5558-mq"
- model : The user-visible name of this sound complex
- audio-cpu : The phandle of CPU DAI
- audio-codec : The phandle of the AK5558 audio ADC

43
sound/soc/fsl/imx-ak5558.c
View File

@ -30,6 +30,7 @@ struct imx_ak5558_data {
bool tdm_mode;
unsigned long slots;
unsigned long slot_width;
bool one2one_ratio;
};
/*
@ -52,8 +53,8 @@ static const struct imx_ak5558_fs_mul fs_mul[] = {
{ .min = 44100, .max = 48000, .mul = 512 },
{ .min = 88200, .max = 96000, .mul = 256 },
{ .min = 176400, .max = 192000, .mul = 128 },
{ .min = 352800, .max = 384000, .mul = 2*64 },
{ .min = 705600, .max = 768000, .mul = 2*32 },
{ .min = 352800, .max = 384000, .mul = 64 },
{ .min = 705600, .max = 768000, .mul = 32 },
};
/*
@ -196,6 +197,35 @@ static int imx_aif_hw_params(struct snd_pcm_substream *substream,
return ret;
}
static int imx_ak5558_hw_rule_rate(struct snd_pcm_hw_params *p,
struct snd_pcm_hw_rule *r)
{
struct imx_ak5558_data *data = r->private;
struct snd_interval t = { .min = 8000, .max = 8000, };
unsigned int fs;
unsigned long mclk_freq;
int i;
fs = hw_param_interval(p, SNDRV_PCM_HW_PARAM_SAMPLE_BITS)->min;
fs *= data->tdm_mode ? 8 : 2;
/* Identify maximum supported rate */
for (i = 0; i < ARRAY_SIZE(ak5558_rates); i++) {
mclk_freq = fs * ak5558_rates[i];
/* Adjust SAI bclk:mclk ratio */
mclk_freq *= data->one2one_ratio ? 1 : 2;
/* Skip rates for which MCLK is beyond supported value */
if (mclk_freq > 36864000)
continue;
if (t.max < ak5558_rates[i])
t.max = ak5558_rates[i];
}
return snd_interval_refine(hw_param_interval(p, r->var), &t);
}
static int imx_aif_startup(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
@ -224,10 +254,12 @@ static int imx_aif_startup(struct snd_pcm_substream *substream)
constraint_channels.count = ARRAY_SIZE(ak5558_channels);
ret = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
&constraint_channels);
if (ret)
if (ret < 0)
return ret;
return 0;
return snd_pcm_hw_rule_add(substream->runtime, 0,
SNDRV_PCM_HW_PARAM_RATE, imx_ak5558_hw_rule_rate, data,
SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
}
static struct snd_soc_ops imx_aif_ops = {
@ -289,6 +321,8 @@ static int imx_ak5558_probe(struct platform_device *pdev)
priv->card.owner = THIS_MODULE;
priv->card.dapm_widgets = imx_ak5558_dapm_widgets;
priv->card.num_dapm_widgets = ARRAY_SIZE(imx_ak5558_dapm_widgets);
priv->one2one_ratio = !of_device_is_compatible(pdev->dev.of_node,
"fsl,imx-audio-ak5558-mq");
ret = snd_soc_of_parse_card_name(&priv->card, "model");
if (ret)
@ -314,6 +348,7 @@ fail:
static const struct of_device_id imx_ak5558_dt_ids[] = {
{ .compatible = "fsl,imx-audio-ak5558", },
{ .compatible = "fsl,imx-audio-ak5558-mq", },
{ },
};
MODULE_DEVICE_TABLE(of, imx_ak5558_dt_ids);