[PATCH 03/13] ASoC: dwc: add runtime suspend/resume functionality

[Alex Deucher]

From: Maruthi Srinivas Bayyavarapu <maruthi.bayyavar...@amd.com>

When DW controller is in master mode, it can disable/enable clock
during the device runtime suspend/resume sequence.

Signed-off-by: Maruthi Bayyavarapu <maruthi.bayyavarapu at amd.com>
Reviewed-by: Alex Deucher <alexander.deucher at amd.com>
Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
---
 sound/soc/dwc/designware_i2s.c | 26 +++++++++++++++++++++++++-
 1 file changed, 25 insertions(+), 1 deletion(-)

diff --git a/sound/soc/dwc/designware_i2s.c b/sound/soc/dwc/designware_i2s.c
index 6e6a70c..3d7754c 100644
--- a/sound/soc/dwc/designware_i2s.c
+++ b/sound/soc/dwc/designware_i2s.c
@@ -18,6 +18,7 @@
 #include <linux/interrupt.h>
 #include <linux/module.h>
 #include <linux/slab.h>
+#include <linux/pm_runtime.h>
 #include <sound/designware_i2s.h>
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
@@ -394,6 +395,23 @@ static const struct snd_soc_component_driver 
dw_i2s_component = {
 };

 #ifdef CONFIG_PM
+static int dw_i2s_runtime_suspend(struct device *dev)
+{
+       struct dw_i2s_dev *dw_dev = dev_get_drvdata(dev);
+
+       if (dw_dev->capability & DW_I2S_MASTER)
+               clk_disable(dw_dev->clk);
+       return 0;
+}
+
+static int dw_i2s_runtime_resume(struct device *dev)
+{
+       struct dw_i2s_dev *dw_dev = dev_get_drvdata(dev);
+
+       if (dw_dev->capability & DW_I2S_MASTER)
+               clk_enable(dw_dev->clk);
+       return 0;
+}

 static int dw_i2s_suspend(struct snd_soc_dai *dai)
 {
@@ -649,7 +667,7 @@ static int dw_i2s_probe(struct platform_device *pdev)
                        goto err_clk_disable;
                }
        }
-
+       pm_runtime_enable(&pdev->dev);
        return 0;

 err_clk_disable:
@@ -665,6 +683,7 @@ static int dw_i2s_remove(struct platform_device *pdev)
        if (dev->capability & DW_I2S_MASTER)
                clk_disable_unprepare(dev->clk);

+       pm_runtime_disable(&pdev->dev);
        return 0;
 }

@@ -677,12 +696,17 @@ static const struct of_device_id dw_i2s_of_match[] = {
 MODULE_DEVICE_TABLE(of, dw_i2s_of_match);
 #endif

+static const struct dev_pm_ops dwc_pm_ops = {
+       SET_RUNTIME_PM_OPS(dw_i2s_runtime_suspend, dw_i2s_runtime_resume, NULL)
+};
+
 static struct platform_driver dw_i2s_driver = {
        .probe          = dw_i2s_probe,
        .remove         = dw_i2s_remove,
        .driver         = {
                .name   = "designware-i2s",
                .of_match_table = of_match_ptr(dw_i2s_of_match),
+               .pm = &dwc_pm_ops,
        },
 };

-- 
1.8.3.1