[RFC 09/10] ASoC: hdac_hda: add runtime PM support

[Rakesh Ughreja <rakesh.a.ughreja@intel.com>]

Add power management support.

Signed-off-by: Rakesh Ughreja <rakesh.a.ughreja@intel.com>
---
 sound/soc/codecs/hdac_hda.c | 49 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)

diff --git a/sound/soc/codecs/hdac_hda.c b/sound/soc/codecs/hdac_hda.c
index 80aadde..9a5188a 100644
--- a/sound/soc/codecs/hdac_hda.c
+++ b/sound/soc/codecs/hdac_hda.c
@@ -547,8 +547,57 @@ static int hdac_hda_dev_remove(struct hdac_device *hdev)
 	return 0;
 }
 
+#ifdef CONFIG_PM
+static int hdac_hda_runtime_suspend(struct device *dev)
+{
+	struct hdac_device *hdac = dev_to_hdac_dev(dev);
+	struct hdac_bus *bus = hdac->bus;
+	struct hdac_ext_link *hlink = NULL;
+
+	dev_dbg(dev, "%s: entry\n", __func__);
+
+	dev_dbg(dev, "calling legacy codec suspend\n");
+	hda_codec_runtime_suspend(dev);
+	dev_dbg(dev, "legacy codec suspended\n");
+
+	hlink = snd_hdac_ext_bus_get_link(bus, dev_name(dev));
+	if (!hlink) {
+		dev_err(dev, "hdac link not found\n");
+		return -EIO;
+	}
+	snd_hdac_ext_bus_link_put(bus, hlink);
+	return 0;
+}
+
+static int hdac_hda_runtime_resume(struct device *dev)
+{
+	struct hdac_device *hdac = dev_to_hdac_dev(dev);
+	struct hdac_bus *bus = hdac->bus;
+	struct hdac_ext_link *hlink = NULL;
+
+	dev_dbg(dev, "%s: entry\n", __func__);
+
+	/* controller may not have been initialized for the first time */
+	if (!bus)
+		return 0;
+
+	hlink = snd_hdac_ext_bus_get_link(bus, dev_name(dev));
+	if (!hlink) {
+		dev_err(dev, "hdac link not found\n");
+		return -EIO;
+	}
+	snd_hdac_ext_bus_link_get(bus, hlink);
+
+	dev_dbg(dev, "calling legacy codec resume\n");
+	hda_codec_runtime_resume(dev);
+	dev_dbg(dev, "%s: exit\n", __func__);
+
+	return 0;
+}
+#else
 #define hdac_hda_runtime_suspend NULL
 #define hdac_hda_runtime_resume NULL
+#endif
 
 static const struct dev_pm_ops hdac_hda_pm = {
 	SET_RUNTIME_PM_OPS(hdac_hda_runtime_suspend,
-- 
2.7.4