ASoC: dwc: support dw i2s in slave mode

dw i2s controller can work in slave mode, codec being master.
dw i2s is made to support master/slave operation, by reading dwc
register.

Signed-off-by: Maruthi Bayyavarapu <maruthi.bayyavarapu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/include/sound/designware_i2s.h b/include/sound/designware_i2s.h
index 3a8fca9..8966ba7 100644 (file)
--- a/include/sound/designware_i2s.h
+++ b/include/sound/designware_i2s.h
@@ -38,6 +38,8 @@ struct i2s_clk_config_data {
 struct i2s_platform_data {
        #define DWC_I2S_PLAY    (1 << 0)
        #define DWC_I2S_RECORD  (1 << 1)
+       #define DW_I2S_SLAVE    (1 << 2)
+       #define DW_I2S_MASTER   (1 << 3)
        unsigned int cap;
        int channel;
        u32 snd_fmts;

diff --git a/sound/soc/dwc/designware_i2s.c b/sound/soc/dwc/designware_i2s.c
index a3e97b4..3a52f82 100644 (file)
--- a/sound/soc/dwc/designware_i2s.c
+++ b/sound/soc/dwc/designware_i2s.c
@@ -273,23 +273,25 @@ static int dw_i2s_hw_params(struct snd_pcm_substream *substream,
 
        config->sample_rate = params_rate(params);
 
-       if (dev->i2s_clk_cfg) {
-               ret = dev->i2s_clk_cfg(config);
-               if (ret < 0) {
-                       dev_err(dev->dev, "runtime audio clk config fail\n");
-                       return ret;
-               }
-       } else {
-               u32 bitclk = config->sample_rate * config->data_width * 2;
-
-               ret = clk_set_rate(dev->clk, bitclk);
-               if (ret) {
-                       dev_err(dev->dev, "Can't set I2S clock rate: %d\n",
-                               ret);
-                       return ret;
+       if (dev->capability & DW_I2S_MASTER) {
+               if (dev->i2s_clk_cfg) {
+                       ret = dev->i2s_clk_cfg(config);
+                       if (ret < 0) {
+                               dev_err(dev->dev, "runtime audio clk config fail\n");
+                               return ret;
+                       }
+               } else {
+                       u32 bitclk = config->sample_rate *
+                                       config->data_width * 2;
+
+                       ret = clk_set_rate(dev->clk, bitclk);
+                       if (ret) {
+                               dev_err(dev->dev, "Can't set I2S clock rate: %d\n",
+                                       ret);
+                               return ret;
+                       }
                }
        }
-
        return 0;
 }
 
@@ -357,7 +359,8 @@ static int dw_i2s_suspend(struct snd_soc_dai *dai)
 {
        struct dw_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
 
-       clk_disable(dev->clk);
+       if (dev->capability & DW_I2S_MASTER)
+               clk_disable(dev->clk);
        return 0;
 }
 
@@ -365,7 +368,8 @@ static int dw_i2s_resume(struct snd_soc_dai *dai)
 {
        struct dw_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
 
-       clk_enable(dev->clk);
+       if (dev->capability & DW_I2S_MASTER)
+               clk_enable(dev->clk);
        return 0;
 }
 
@@ -443,6 +447,14 @@ static int dw_configure_dai(struct dw_i2s_dev *dev,
                dw_i2s_dai->capture.rates = rates;
        }
 
+       if (COMP1_MODE_EN(comp1)) {
+               dev_dbg(dev->dev, "designware: i2s master mode supported\n");
+               dev->capability |= DW_I2S_MASTER;
+       } else {
+               dev_dbg(dev->dev, "designware: i2s slave mode supported\n");
+               dev->capability |= DW_I2S_SLAVE;
+       }
+
        return 0;
 }
 
@@ -529,6 +541,7 @@ static int dw_i2s_probe(struct platform_device *pdev)
        struct resource *res;
        int ret;
        struct snd_soc_dai_driver *dw_i2s_dai;
+       const char *clk_id;
 
        dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
        if (!dev) {
@@ -550,32 +563,35 @@ static int dw_i2s_probe(struct platform_device *pdev)
                return PTR_ERR(dev->i2s_base);
 
        dev->dev = &pdev->dev;
+
        if (pdata) {
+               dev->capability = pdata->cap;
+               clk_id = NULL;
                ret = dw_configure_dai_by_pd(dev, dw_i2s_dai, res, pdata);
-               if (ret < 0)
-                       return ret;
+       } else {
+               clk_id = "i2sclk";
+               ret = dw_configure_dai_by_dt(dev, dw_i2s_dai, res);
+       }
+       if (ret < 0)
+               return ret;
 
-               dev->capability = pdata->cap;
-               dev->i2s_clk_cfg = pdata->i2s_clk_cfg;
-               if (!dev->i2s_clk_cfg) {
-                       dev_err(&pdev->dev, "no clock configure method\n");
-                       return -ENODEV;
+       if (dev->capability & DW_I2S_MASTER) {
+               if (pdata) {
+                       dev->i2s_clk_cfg = pdata->i2s_clk_cfg;
+                       if (!dev->i2s_clk_cfg) {
+                               dev_err(&pdev->dev, "no clock configure method\n");
+                               return -ENODEV;
+                       }
                }
+               dev->clk = devm_clk_get(&pdev->dev, clk_id);
 
-               dev->clk = devm_clk_get(&pdev->dev, NULL);
-       } else {
-               ret = dw_configure_dai_by_dt(dev, dw_i2s_dai, res);
+               if (IS_ERR(dev->clk))
+                       return PTR_ERR(dev->clk);
+
+               ret = clk_prepare_enable(dev->clk);
                if (ret < 0)
                        return ret;
-
-               dev->clk = devm_clk_get(&pdev->dev, "i2sclk");
        }
-       if (IS_ERR(dev->clk))
-               return PTR_ERR(dev->clk);
-
-       ret = clk_prepare_enable(dev->clk);
-       if (ret < 0)
-               return ret;
 
        dev_set_drvdata(&pdev->dev, dev);
        ret = devm_snd_soc_register_component(&pdev->dev, &dw_i2s_component,
@@ -597,7 +613,8 @@ static int dw_i2s_probe(struct platform_device *pdev)
        return 0;
 
 err_clk_disable:
-       clk_disable_unprepare(dev->clk);
+       if (dev->capability & DW_I2S_MASTER)
+               clk_disable_unprepare(dev->clk);
        return ret;
 }
 
@@ -605,7 +622,8 @@ static int dw_i2s_remove(struct platform_device *pdev)
 {
        struct dw_i2s_dev *dev = dev_get_drvdata(&pdev->dev);
 
-       clk_disable_unprepare(dev->clk);
+       if (dev->capability & DW_I2S_MASTER)
+               clk_disable_unprepare(dev->clk);
 
        return 0;
 }