ASoC: hdac_hdmi: Use i915 component framework for PM

Use the component framework to keep the display on till the
playback in progress.
Signed-off-by: Subhransu S. Prusty <subhransu.s.prusty@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/hdac_hdmi.c

@@ -25,6 +25,7 @@
 #include <sound/pcm_params.h>
 #include <sound/soc.h>
 #include <sound/hdaudio_ext.h>
+#include <sound/hda_i915.h>
 #include "../../hda/local.h"
 
 #define AMP_OUT_MUTE		0xb080
@@ -559,14 +560,26 @@ static int hdac_hdmi_runtime_suspend(struct device *dev)
 {
 	struct hdac_ext_device *edev = to_hda_ext_device(dev);
 	struct hdac_device *hdac = &edev->hdac;
+	struct hdac_bus *bus = hdac->bus;
+	int err;
 
 	dev_dbg(dev, "Enter: %s\n", __func__);
 
+	/* controller may not have been initialized for the first time */
+	if (!bus)
+		return 0;
+
 	/* Power down afg */
 	if (!snd_hdac_check_power_state(hdac, hdac->afg, AC_PWRST_D3))
 		snd_hdac_codec_write(hdac, hdac->afg, 0,
 			AC_VERB_SET_POWER_STATE, AC_PWRST_D3);
 
+	err = snd_hdac_display_power(bus, false);
+	if (err < 0) {
+		dev_err(bus->dev, "Cannot turn on display power on i915\n");
+		return err;
+	}
+
 	return 0;
 }
 
@@ -574,9 +587,21 @@ static int hdac_hdmi_runtime_resume(struct device *dev)
 {
 	struct hdac_ext_device *edev = to_hda_ext_device(dev);
 	struct hdac_device *hdac = &edev->hdac;
+	struct hdac_bus *bus = hdac->bus;
+	int err;
 
 	dev_dbg(dev, "Enter: %s\n", __func__);
 
+	/* controller may not have been initialized for the first time */
+	if (!bus)
+		return 0;
+
+	err = snd_hdac_display_power(bus, true);
+	if (err < 0) {
+		dev_err(bus->dev, "Cannot turn on display power on i915\n");
+		return err;
+	}
+
 	/* Power up afg */
 	if (!snd_hdac_check_power_state(hdac, hdac->afg, AC_PWRST_D0))
 		snd_hdac_codec_write(hdac, hdac->afg, 0,