ALSA: hda - hdmi setup pin when monitor hotplug in pcm dynamic assignment mode

Setup pin configuration when monitor is hotplugged
in pcm dynamic assignment if the PCM is in open state.

When monitor is disconnect, The pin will be reset.
Signed-off-by: Libin Yang <libin.yang@linux.intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/hda/patch_hdmi.c

@@ -146,6 +146,11 @@ struct hdmi_spec {
 	/* pcm_bitmap means which pcms have been assigned to pins*/
 	unsigned long pcm_bitmap;
 	int pcm_used;	/* counter of pcm_rec[] */
+	/* bitmap shows whether the pcm is opened in user space
+	 * bit 0 means the first playback PCM (PCM3);
+	 * bit 1 means the second playback PCM, and so on.
+	 */
+	unsigned long pcm_in_use;
 	unsigned int channels_max; /* max over all cvts */
 
 	struct hdmi_eld temp_eld;
@@ -1525,10 +1530,14 @@ static int hdmi_pcm_open_no_pin(struct hda_pcm_stream *hinfo,
 {
 	struct hdmi_spec *spec = codec->spec;
 	struct snd_pcm_runtime *runtime = substream->runtime;
-	int cvt_idx;
+	int cvt_idx, pcm_idx;
 	struct hdmi_spec_per_cvt *per_cvt = NULL;
 	int err;
 
+	pcm_idx = hinfo_to_pcm_index(codec, hinfo);
+	if (pcm_idx < 0)
+		return -EINVAL;
+
 	err = hdmi_choose_cvt(codec, -1, &cvt_idx, NULL);
 	if (err)
 		return err;
@@ -1539,6 +1548,7 @@ static int hdmi_pcm_open_no_pin(struct hda_pcm_stream *hinfo,
 
 	intel_not_share_assigned_cvt_nid(codec, 0, per_cvt->cvt_nid);
 
+	set_bit(pcm_idx, &spec->pcm_in_use);
 	/* todo: setup spdif ctls assign */
 
 	/* Initially set the converter's capabilities */
@@ -1607,7 +1617,7 @@ static int hdmi_pcm_open(struct hda_pcm_stream *hinfo,
 	/* Claim converter */
 	per_cvt->assigned = 1;
 
-
+	set_bit(pcm_idx, &spec->pcm_in_use);
 	per_pin = get_pin(spec, pin_idx);
 	per_pin->cvt_nid = per_cvt->cvt_nid;
 	hinfo->nid = per_cvt->cvt_nid;
@@ -1732,6 +1742,71 @@ static void hdmi_detach_hda_pcm(struct hdmi_spec *spec,
 		clear_bit(idx, &spec->pcm_bitmap);
 }
 
+static int hdmi_get_pin_cvt_mux(struct hdmi_spec *spec,
+		struct hdmi_spec_per_pin *per_pin, hda_nid_t cvt_nid)
+{
+	int mux_idx;
+
+	for (mux_idx = 0; mux_idx < per_pin->num_mux_nids; mux_idx++)
+		if (per_pin->mux_nids[mux_idx] == cvt_nid)
+			break;
+	return mux_idx;
+}
+
+static bool check_non_pcm_per_cvt(struct hda_codec *codec, hda_nid_t cvt_nid);
+
+static void hdmi_pcm_setup_pin(struct hdmi_spec *spec,
+			   struct hdmi_spec_per_pin *per_pin)
+{
+	struct hda_codec *codec = per_pin->codec;
+	struct hda_pcm *pcm;
+	struct hda_pcm_stream *hinfo;
+	struct snd_pcm_substream *substream;
+	int mux_idx;
+	bool non_pcm;
+
+	if (per_pin->pcm_idx >= 0 && per_pin->pcm_idx < spec->pcm_used)
+		pcm = spec->pcm_rec[per_pin->pcm_idx];
+	else
+		return;
+	if (!test_bit(per_pin->pcm_idx, &spec->pcm_in_use))
+		return;
+
+	/* hdmi audio only uses playback and one substream */
+	hinfo = pcm->stream;
+	substream = pcm->pcm->streams[0].substream;
+
+	per_pin->cvt_nid = hinfo->nid;
+
+	mux_idx = hdmi_get_pin_cvt_mux(spec, per_pin, hinfo->nid);
+	if (mux_idx < per_pin->num_mux_nids)
+		snd_hda_codec_write_cache(codec, per_pin->pin_nid, 0,
+				AC_VERB_SET_CONNECT_SEL,
+				mux_idx);
+	snd_hda_spdif_ctls_assign(codec, per_pin->pcm_idx, hinfo->nid);
+
+	non_pcm = check_non_pcm_per_cvt(codec, hinfo->nid);
+	if (substream->runtime)
+		per_pin->channels = substream->runtime->channels;
+	per_pin->setup = true;
+	per_pin->mux_idx = mux_idx;
+
+	hdmi_setup_audio_infoframe(codec, per_pin, non_pcm);
+}
+
+static void hdmi_pcm_reset_pin(struct hdmi_spec *spec,
+			   struct hdmi_spec_per_pin *per_pin)
+{
+	if (per_pin->pcm_idx >= 0 && per_pin->pcm_idx < spec->pcm_used)
+		snd_hda_spdif_ctls_unassign(per_pin->codec, per_pin->pcm_idx);
+
+	per_pin->chmap_set = false;
+	memset(per_pin->chmap, 0, sizeof(per_pin->chmap));
+
+	per_pin->setup = false;
+	per_pin->channels = 0;
+}
+
 /* update per_pin ELD from the given new ELD;
  * setup info frame and notification accordingly
  */
@@ -1745,10 +1820,13 @@ static void update_eld(struct hda_codec *codec,
 	bool eld_changed;
 
 	if (spec->dyn_pcm_assign) {
-		if (eld->eld_valid)
+		if (eld->eld_valid) {
 			hdmi_attach_hda_pcm(spec, per_pin);
-		else
+			hdmi_pcm_setup_pin(spec, per_pin);
+		} else {
+			hdmi_pcm_reset_pin(spec, per_pin);
 			hdmi_detach_hda_pcm(spec, per_pin);
+		}
 	}
 
 	if (eld->eld_valid)
@@ -2159,6 +2237,7 @@ static int hdmi_pcm_close(struct hda_pcm_stream *hinfo,
 		hinfo->nid = 0;
 
 		mutex_lock(&spec->pcm_lock);
+		clear_bit(pcm_idx, &spec->pcm_in_use);
 		pin_idx = hinfo_to_pin_index(codec, hinfo);
 		if (spec->dyn_pcm_assign && pin_idx < 0) {
 			mutex_unlock(&spec->pcm_lock);