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Commit 10884347 authored by Hebbar, Gururaja's avatar Hebbar, Gururaja Committed by Mark Brown
Browse files

ASoC: McASP: Convert driver to use Runtime PM API 



  * Add Runtime PM support to McASP host controller.
  * Use Runtime PM API to enable/disable McASP clock.

This was tested on AM18x Board using suspend/resume

Signed-off-by: default avatarHebbar, Gururaja <gururaja.hebbar@ti.com>
Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
parent 8f245499

sound/soc/davinci/davinci-mcasp.c

+19 −21
Original line number Diff line number Diff line
@@ -21,7 +21,7 @@ 
#include <linux/slab.h>

#include <linux/delay.h>

#include <linux/io.h>

#include <linux/clk.h>

#include <linux/pm_runtime.h>



#include <sound/core.h>

#include <sound/pcm.h>
@@ -776,20 +776,17 @@ static int davinci_mcasp_trigger(struct snd_pcm_substream *substream, 
	case SNDRV_PCM_TRIGGER_RESUME:

	case SNDRV_PCM_TRIGGER_START:

	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:

		if (!dev->clk_active) {

			clk_enable(dev->clk);

			dev->clk_active = 1;

		}

		ret = pm_runtime_get_sync(dev->dev);

		if (IS_ERR_VALUE(ret))

			dev_err(dev->dev, "pm_runtime_get_sync() failed\n");

		davinci_mcasp_start(dev, substream->stream);

		break;



	case SNDRV_PCM_TRIGGER_SUSPEND:

		davinci_mcasp_stop(dev, substream->stream);

		if (dev->clk_active) {

			clk_disable(dev->clk);

			dev->clk_active = 0;

		}



		ret = pm_runtime_put_sync(dev->dev);

		if (IS_ERR_VALUE(ret))

			dev_err(dev->dev, "pm_runtime_put_sync() failed\n");

		break;



	case SNDRV_PCM_TRIGGER_STOP:
@@ -886,12 +883,13 @@ static int davinci_mcasp_probe(struct platform_device *pdev) 
	}



	pdata = pdev->dev.platform_data;

	dev->clk = clk_get(&pdev->dev, NULL);

	if (IS_ERR(dev->clk))

		return -ENODEV;

	pm_runtime_enable(&pdev->dev);



	clk_enable(dev->clk);

	dev->clk_active = 1;

	ret = pm_runtime_get_sync(&pdev->dev);

	if (IS_ERR_VALUE(ret)) {

		dev_err(&pdev->dev, "pm_runtime_get_sync() failed\n");

		return ret;

	}



	dev->base = devm_ioremap(&pdev->dev, mem->start, resource_size(mem));

	if (!dev->base) {
@@ -908,6 +906,7 @@ static int davinci_mcasp_probe(struct platform_device *pdev) 
	dev->version = pdata->version;

	dev->txnumevt = pdata->txnumevt;

	dev->rxnumevt = pdata->rxnumevt;

	dev->dev = &pdev->dev;



	dma_data = &dev->dma_params[SNDRV_PCM_STREAM_PLAYBACK];

	dma_data->asp_chan_q = pdata->asp_chan_q;
@@ -949,19 +948,18 @@ static int davinci_mcasp_probe(struct platform_device *pdev) 
	return 0;



err_release_clk:

	clk_disable(dev->clk);

	clk_put(dev->clk);

	pm_runtime_put_sync(&pdev->dev);

	pm_runtime_disable(&pdev->dev);

	return ret;

}



static int davinci_mcasp_remove(struct platform_device *pdev)

{

	struct davinci_audio_dev *dev = dev_get_drvdata(&pdev->dev);



	snd_soc_unregister_dai(&pdev->dev);

	clk_disable(dev->clk);

	clk_put(dev->clk);

	dev->clk = NULL;



	pm_runtime_put_sync(&pdev->dev);

	pm_runtime_disable(&pdev->dev);



	return 0;

}

sound/soc/davinci/davinci-mcasp.h

+1 −2
Original line number Diff line number Diff line
@@ -40,9 +40,8 @@ struct davinci_audio_dev { 
	struct davinci_pcm_dma_params dma_params[2];

	void __iomem *base;

	int sample_rate;

	struct clk *clk;

	struct device *dev;

	unsigned int codec_fmt;

	u8 clk_active;



	/* McASP specific data */

	int	tdm_slots;