[PATCH 4/5] ASoC: amd: added pmops for pci driver

[Ravulapati Vishnu vardhan rao]

Runtime powermanagement is added for PCI driver.
When there is no activity for at least 10 secs driver
suspends automatically.Runtime- Suspend and resume Stub functions
are added.

Signed-off-by: Ravulapati Vishnu vardhan rao <Vishnuvardhanrao.Ravulapati@xxxxxxx>
Reviewed-by: Vijendar Mukunda <vijendar.mukunda@xxxxxxx>
---
 sound/soc/amd/raven/pci-acp3x.c | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/sound/soc/amd/raven/pci-acp3x.c b/sound/soc/amd/raven/pci-acp3x.c
index c0b8fad..6fbb720 100644
--- a/sound/soc/amd/raven/pci-acp3x.c
+++ b/sound/soc/amd/raven/pci-acp3x.c
@@ -170,6 +170,11 @@ static int snd_acp3x_probe(struct pci_dev *pci,
 		ret = -ENODEV;
 		goto unmap_mmio;
 	}
+	pm_runtime_set_autosuspend_delay(&pci->dev, 10000);
+	pm_runtime_use_autosuspend(&pci->dev);
+	pm_runtime_set_active(&pci->dev);
+	pm_runtime_put_noidle(&pci->dev);
+	pm_runtime_enable(&pci->dev);
 	return 0;
 
 unmap_mmio:
@@ -189,6 +194,23 @@ static int snd_acp3x_probe(struct pci_dev *pci,
 	return -ENODEV;
 }
 
+static int  snd_acp3x_suspend(struct device *dev)
+{
+	return 0;
+}
+
+static int  snd_acp3x_resume(struct device *dev)
+{
+	return 0;
+}
+
+static const struct dev_pm_ops acp3x_pm = {
+	.runtime_suspend = snd_acp3x_suspend,
+	.runtime_resume =  snd_acp3x_resume,
+	.resume	=	snd_acp3x_resume,
+
+};
+
 static void snd_acp3x_remove(struct pci_dev *pci)
 {
 	struct acp3x_dev_data *adata = pci_get_drvdata(pci);
@@ -196,6 +218,8 @@ static void snd_acp3x_remove(struct pci_dev *pci)
 	kfree(adata->res);
 	kfree(adata->cell);
 	iounmap(adata->acp3x_base);
+	pm_runtime_disable(&pci->dev);
+	pm_runtime_get_noresume(&pci->dev);
 	pci_disable_msi(pci);
 	pci_release_regions(pci);
 	pci_disable_device(pci);
@@ -214,6 +238,9 @@ static struct pci_driver acp3x_driver  = {
 	.id_table = snd_acp3x_ids,
 	.probe = snd_acp3x_probe,
 	.remove = snd_acp3x_remove,
+	.driver = {
+		.pm = &acp3x_pm,
+	}
 };
 
 module_pci_driver(acp3x_driver);
-- 
2.7.4