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Commit 6cab2d3d authored by Ben Dooks's avatar Ben Dooks Committed by Jaroslav Kysela
Browse files

[ALSA] S3C2412: suspend and resume support 



Support for suspend/resume for the S3C2412 ASoC IIS
core driver.

Signed-off-by: default avatarBen Dooks <ben-linux@fluff.org>
Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
Signed-off-by: default avatarJaroslav Kysela <perex@perex.cz>
parent 49646dfa

sound/soc/s3c24xx/s3c2412-i2s.c

+63 −0
Original line number Diff line number Diff line
@@ -79,6 +79,10 @@ struct s3c2412_i2s_info { 
	struct clk	*iis_clk;

	struct clk	*iis_pclk;

	struct clk	*iis_cclk;



	u32		 suspend_iismod;

	u32		 suspend_iiscon;

	u32		 suspend_iispsr;

};



static struct s3c2412_i2s_info s3c2412_i2s;
@@ -641,6 +645,63 @@ static int s3c2412_i2s_probe(struct platform_device *pdev) 
	return 0;

}



#ifdef CONFIG_PM

static int s3c2412_i2s_suspend(struct platform_device *dev,

			      struct snd_soc_cpu_dai *dai)

{

	struct s3c2412_i2s_info *i2s = &s3c2412_i2s;

	u32 iismod;



	if (dai->active) {

		i2s->suspend_iismod = readl(i2s->regs + S3C2412_IISMOD);

		i2s->suspend_iiscon = readl(i2s->regs + S3C2412_IISCON);

		i2s->suspend_iispsr = readl(i2s->regs + S3C2412_IISPSR);



		/* some basic suspend checks */



		iismod = readl(i2s->regs + S3C2412_IISMOD);



		if (iismod & S3C2412_IISCON_RXDMA_ACTIVE)

			dev_warn(&dev->dev, "%s: RXDMA active?\n", __func__);



		if (iismod & S3C2412_IISCON_TXDMA_ACTIVE)

			dev_warn(&dev->dev, "%s: TXDMA active?\n", __func__);



		if (iismod & S3C2412_IISCON_IIS_ACTIVE)

			dev_warn(&dev->dev, "%s: IIS active\n", __func__);

	}



	return 0;

}



static int s3c2412_i2s_resume(struct platform_device *pdev,

			      struct snd_soc_cpu_dai *dai)

{

	struct s3c2412_i2s_info *i2s = &s3c2412_i2s;



	dev_info(&pdev->dev, "dai_active %d, IISMOD %08x, IISCON %08x\n",

		 dai->active, i2s->suspend_iismod, i2s->suspend_iiscon);



	if (dai->active) {

		writel(i2s->suspend_iiscon, i2s->regs + S3C2412_IISCON);

		writel(i2s->suspend_iismod, i2s->regs + S3C2412_IISMOD);

		writel(i2s->suspend_iispsr, i2s->regs + S3C2412_IISPSR);



		writel(S3C2412_IISFIC_RXFLUSH | S3C2412_IISFIC_TXFLUSH,

		       i2s->regs + S3C2412_IISFIC);



		ndelay(250);

		writel(0x0, i2s->regs + S3C2412_IISFIC);



	}



	return 0;

}

#else

#define s3c2412_i2s_suspend NULL

#define s3c2412_i2s_resume  NULL

#endif /* CONFIG_PM */



#define S3C2412_I2S_RATES \

	(SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_16000 | \

	SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
@@ -651,6 +712,8 @@ struct snd_soc_cpu_dai s3c2412_i2s_dai = { 
	.id	= 0,

	.type	= SND_SOC_DAI_I2S,

	.probe	= s3c2412_i2s_probe,

	.suspend = s3c2412_i2s_suspend,

	.resume = s3c2412_i2s_resume,

	.playback = {

		.channels_min	= 2,

		.channels_max	= 2,