[alsa-devel] [PATCH 4/4] ALSA: hda - Wake the codec up on pin/ELD notify events

[David Henningsson]

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 at canonical.com>
---
 sound/pci/hda/patch_hdmi.c | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c
index a97db5f..932292c 100644
--- a/sound/pci/hda/patch_hdmi.c
+++ b/sound/pci/hda/patch_hdmi.c
@@ -37,6 +37,8 @@
 #include <sound/jack.h>
 #include <sound/asoundef.h>
 #include <sound/tlv.h>
+#include <sound/hdaudio.h>
+#include <sound/hda_i915.h>
 #include "hda_codec.h"
 #include "hda_local.h"
 #include "hda_jack.h"
@@ -144,6 +146,9 @@ struct hdmi_spec {
 	 */
 	struct hda_multi_out multiout;
 	struct hda_pcm_stream pcm_playback;
+
+	/* i915/powerwell (Haswell+/Valleyview+) specific */
+	struct i915_audio_component_audio_ops i915_audio_ops;
 };
 
 
@@ -2191,6 +2196,9 @@ static void generic_hdmi_free(struct hda_codec *codec)
 	struct hdmi_spec *spec = codec->spec;
 	int pin_idx;
 
+	if (is_haswell_plus(codec) || is_valleyview_plus(codec))
+		snd_hdac_i915_register_notifier(NULL);
+
 	for (pin_idx = 0; pin_idx < spec->num_pins; pin_idx++) {
 		struct hdmi_spec_per_pin *per_pin = get_pin(spec, pin_idx);
 
@@ -2316,6 +2324,14 @@ 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_pin_eld_notify(void *audio_ptr, int port, int port_mst_index)
+{
+	struct hda_codec *codec = audio_ptr;
+	int pin_nid = port + 0x04;
+
+	check_presence_and_report(codec, pin_nid);
+}
+
 static int patch_generic_hdmi(struct hda_codec *codec)
 {
 	struct hdmi_spec *spec;
@@ -2342,8 +2358,12 @@ 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;
+		spec->i915_audio_ops.audio_ptr = codec;
+		spec->i915_audio_ops.pin_eld_notify = intel_pin_eld_notify;
+		snd_hdac_i915_register_notifier(&spec->i915_audio_ops);
+	}
 
 	if (hdmi_parse_codec(codec) < 0) {
 		codec->spec = NULL;
-- 
1.9.1