[PATCH 4/4] ALSA: hda - Wake the codec up on hotplug notify events

[David Henningsson <david.henningsson@canonical.com>]

Whenever there is an event from the i915 driver, wake the codec
and recheck plug/unplug + ELD status.

This fixes the issue with lost unsol events in power save mode,
the codec and controller can now sleep in D3 and still know when
the HDMI monitor has been connected.

Signed-off-by: David Henningsson <david.henningsson@canonical.com>
---
 sound/pci/hda/patch_hdmi.c |   13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c
index 2f24338..6cc1524 100644
--- a/sound/pci/hda/patch_hdmi.c
+++ b/sound/pci/hda/patch_hdmi.c
@@ -2316,6 +2316,15 @@ static void haswell_set_power_state(struct hda_codec *codec, hda_nid_t fg,
 	snd_hda_codec_set_power_to_all(codec, fg, power_state);
 }
 
+static void intel_hotplug_notify(struct hdac_device *dev, int port,
+				 int port_mst_index)
+{
+	struct hda_codec *codec = container_of(dev, struct hda_codec, core);
+	int pin_nid = is_valleyview(codec) ? 0x03 : port + 0x04;
+
+	check_presence_and_report(codec, pin_nid);
+}
+
 static int patch_generic_hdmi(struct hda_codec *codec)
 {
 	struct hdmi_spec *spec;
@@ -2342,8 +2351,10 @@ static int patch_generic_hdmi(struct hda_codec *codec)
 	if (is_valleyview_plus(codec) || is_skylake(codec))
 		codec->core.link_power_control = 1;
 
-	if (is_haswell_plus(codec) || is_valleyview_plus(codec))
+	if (is_haswell_plus(codec) || is_valleyview_plus(codec)) {
 		codec->depop_delay = 0;
+		codec->core.i915_hotplug_notify = intel_hotplug_notify;
+	}
 
 	if (hdmi_parse_codec(codec) < 0) {
 		codec->spec = NULL;
-- 
1.7.9.5

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