1 files changed, 81 insertions, 2 deletions

diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c
index 41eaa89660c3..b8c8490e568b 100644
--- a/sound/pci/hda/patch_hdmi.c
+++ b/sound/pci/hda/patch_hdmi.c
@@ -42,6 +42,11 @@ static bool enable_acomp = true;
 module_param(enable_acomp, bool, 0444);
 MODULE_PARM_DESC(enable_acomp, "Enable audio component binding (default=yes)");
 
+static bool enable_silent_stream =
+IS_ENABLED(CONFIG_SND_HDA_INTEL_HDMI_SILENT_STREAM);
+module_param(enable_silent_stream, bool, 0644);
+MODULE_PARM_DESC(enable_silent_stream, "Enable Silent Stream for HDMI devices");
+
 struct hdmi_spec_per_cvt {
 	hda_nid_t cvt_nid;
 	int assigned;
@@ -160,6 +165,7 @@ struct hdmi_spec {
 
 	bool use_acomp_notifier; /* use eld_notify callback for hotplug */
 	bool acomp_registered; /* audio component registered in this driver */
+	bool force_connect; /* force connectivity */
 	struct drm_audio_component_audio_ops drm_audio_ops;
 	int (*port2pin)(struct hda_codec *, int); /* reverse port/pin mapping */
 
@@ -167,6 +173,7 @@ struct hdmi_spec {
 	hda_nid_t vendor_nid;
 	const int *port_map;
 	int port_num;
+	bool send_silent_stream; /* Flag to enable silent stream feature */
 };
 
 #ifdef CONFIG_SND_HDA_COMPONENT
@@ -1635,21 +1642,72 @@ static void hdmi_present_sense_via_verbs(struct hdmi_spec_per_pin *per_pin,
 	snd_hda_power_down_pm(codec);
 }
 
+static void silent_stream_enable(struct hda_codec *codec,
+				struct hdmi_spec_per_pin *per_pin)
+{
+	unsigned int newval, oldval;
+
+	codec_dbg(codec, "hdmi: enabling silent stream for NID %d\n",
+			per_pin->pin_nid);
+
+	mutex_lock(&per_pin->lock);
+
+	if (!per_pin->channels)
+		per_pin->channels = 2;
+
+	oldval = snd_hda_codec_read(codec, per_pin->pin_nid, 0,
+			AC_VERB_GET_CONV, 0);
+	newval = (oldval & 0xF0) | 0xF;
+	snd_hda_codec_write(codec, per_pin->pin_nid, 0,
+			AC_VERB_SET_CHANNEL_STREAMID, newval);
+
+	hdmi_setup_audio_infoframe(codec, per_pin, per_pin->non_pcm);
+
+	mutex_unlock(&per_pin->lock);
+}
+
 /* update ELD and jack state via audio component */
 static void sync_eld_via_acomp(struct hda_codec *codec,
 			       struct hdmi_spec_per_pin *per_pin)
 {
 	struct hdmi_spec *spec = codec->spec;
 	struct hdmi_eld *eld = &spec->temp_eld;
+	bool monitor_prev, monitor_next;
 
 	mutex_lock(&per_pin->lock);
 	eld->monitor_present = false;
+	monitor_prev = per_pin->sink_eld.monitor_present;
 	eld->eld_size = snd_hdac_acomp_get_eld(&codec->core, per_pin->pin_nid,
 				      per_pin->dev_id, &eld->monitor_present,
 				      eld->eld_buffer, ELD_MAX_SIZE);
 	eld->eld_valid = (eld->eld_size > 0);
 	update_eld(codec, per_pin, eld, 0);
+	monitor_next = per_pin->sink_eld.monitor_present;
 	mutex_unlock(&per_pin->lock);
+
+	/*
+	 * Power-up will call hdmi_present_sense, so the PM calls
+	 * have to be done without mutex held.
+	 */
+
+	if (spec->send_silent_stream) {
+		int pm_ret;
+
+		if (!monitor_prev && monitor_next) {
+			pm_ret = snd_hda_power_up_pm(codec);
+			if (pm_ret < 0)
+				codec_err(codec,
+				"Monitor plugged-in, Failed to power up codec ret=[%d]\n",
+				pm_ret);
+			silent_stream_enable(codec, per_pin);
+		} else if (monitor_prev && !monitor_next) {
+			pm_ret = snd_hda_power_down_pm(codec);
+			if (pm_ret < 0)
+				codec_err(codec,
+				"Monitor plugged-out, Failed to power down codec ret=[%d]\n",
+				pm_ret);
+		}
+	}
 }
 
 static void hdmi_present_sense(struct hdmi_spec_per_pin *per_pin, int repoll)
@@ -1701,7 +1759,8 @@ static int hdmi_add_pin(struct hda_codec *codec, hda_nid_t pin_nid)
 	 * all device entries on the same pin
 	 */
 	config = snd_hda_codec_get_pincfg(codec, pin_nid);
-	if (get_defcfg_connect(config) == AC_JACK_PORT_NONE)
+	if (get_defcfg_connect(config) == AC_JACK_PORT_NONE &&
+	    !spec->force_connect)
 		return 0;
 
 	/*
@@ -1803,11 +1862,19 @@ static int hdmi_add_cvt(struct hda_codec *codec, hda_nid_t cvt_nid)
 	return 0;
 }
 
+static const struct snd_pci_quirk force_connect_list[] = {
+	SND_PCI_QUIRK(0x103c, 0x870f, "HP", 1),
+	SND_PCI_QUIRK(0x103c, 0x871a, "HP", 1),
+	{}
+};
+
 static int hdmi_parse_codec(struct hda_codec *codec)
 {
+	struct hdmi_spec *spec = codec->spec;
 	hda_nid_t start_nid;
 	unsigned int caps;
 	int i, nodes;
+	const struct snd_pci_quirk *q;
 
 	nodes = snd_hda_get_sub_nodes(codec, codec->core.afg, &start_nid);
 	if (!start_nid || nodes < 0) {
@@ -1815,6 +1882,11 @@ static int hdmi_parse_codec(struct hda_codec *codec)
 		return -EINVAL;
 	}
 
+	q = snd_pci_quirk_lookup(codec->bus->pci, force_connect_list);
+
+	if (q && q->value)
+		spec->force_connect = true;
+
 	/*
 	 * hdmi_add_pin() assumes total amount of converters to
 	 * be known, so first discover all converters
@@ -2440,6 +2512,7 @@ static void generic_acomp_notifier_set(struct drm_audio_component *acomp,
 	mutex_lock(&spec->bind_lock);
 	spec->use_acomp_notifier = use_acomp;
 	spec->codec->relaxed_resume = use_acomp;
+	spec->codec->bus->keep_power = 0;
 	/* reprogram each jack detection logic depending on the notifier */
 	for (i = 0; i < spec->num_pins; i++)
 		reprogram_jack_detect(spec->codec,
@@ -2534,7 +2607,6 @@ static void generic_acomp_init(struct hda_codec *codec,
 	if (!snd_hdac_acomp_init(&codec->bus->core, &spec->drm_audio_ops,
 				 match_bound_vga, 0)) {
 		spec->acomp_registered = true;
-		codec->bus->keep_power = 0;
 	}
 }
 
@@ -2802,6 +2874,13 @@ static int intel_hsw_common_init(struct hda_codec *codec, hda_nid_t vendor_nid,
 	spec->ops.setup_stream = i915_hsw_setup_stream;
 	spec->ops.pin_cvt_fixup = i915_pin_cvt_fixup;
 
+	/*
+	 * Enable silent stream feature, if it is enabled via
+	 * module param or Kconfig option
+	 */
+	if (enable_silent_stream)
+		spec->send_silent_stream = true;
+
 	return parse_intel_hdmi(codec);
 }