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MLK-19154-4: ASoC: imx_spdif: set SPDIF ROOT clock freq as function of rate 

Set SPDIF master clock frequency as function of rate.

Signed-off-by: Viorel Suman <viorel.suman@nxp.com>
(cherry picked from commit 407430a03994e4acff508afe8c9772680558c1c5)
5.4-rM2-2.2.x-imx-squashed
Viorel Suman 2018-08-16 14:40:34 +03:00 committed by Dong Aisheng
parent 960f3f4848
commit 084c2ca345
1 changed files with 27 additions and 0 deletions
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27
sound/soc/fsl/imx-spdif.c
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@ -5,12 +5,38 @@
#include <linux/module.h>
#include <linux/of_platform.h>
#include <sound/soc.h>
#include "fsl_spdif.h"
struct imx_spdif_data {
struct snd_soc_dai_link dai;
struct snd_soc_card card;
};
#define CLK_8K_FREQ 24576000
#define CLK_11K_FREQ 22579200
static int imx_spdif_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct device *dev = rtd->card->dev;
int ret;
u64 rate = params_rate(params);
unsigned int freq;
freq = do_div(rate, 8000) ? CLK_11K_FREQ : CLK_8K_FREQ;
ret = snd_soc_dai_set_sysclk(rtd->cpu_dai, STC_TXCLK_SPDIF_ROOT,
freq, SND_SOC_CLOCK_OUT);
if (ret)
dev_err(dev, "failed to set cpu sysclk: %d\n", ret);
return ret;
}
static struct snd_soc_ops imx_spdif_ops = {
.hw_params = imx_spdif_hw_params,
};
static int imx_spdif_audio_probe(struct platform_device *pdev)
{
struct device_node *spdif_np, *np = pdev->dev.of_node;
@ -48,6 +74,7 @@ static int imx_spdif_audio_probe(struct platform_device *pdev)
data->dai.platforms->of_node = spdif_np;
data->dai.playback_only = true;
data->dai.capture_only = true;
data->dai.ops = &imx_spdif_ops;
if (of_property_read_bool(np, "spdif-out"))
data->dai.capture_only = false;