ALSA: hda - Re-implementation of VIA Independent-HP sharing with side stream

This patch adds the re-implementation of Independent-HP mode in the
case where the DAC is shared between HP and side-channel streams.
Now the driver tries to parse the output-path using the pre-parsed
side-channel DAC for the independent HP output, too.

When a playback PCM stream is opened with this shared mode, the
Independent-HP mixer switch can't be changed for avoiding the conflict,
thus it returns -EBUSY error.

One remaining unintuitive issue is that the DAC volume is still
controlled as "Side" volume although it's shared by both independent-HP
and side streams.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 37 insertions, 6 deletions

diff --git a/sound/pci/hda/patch_via.c b/sound/pci/hda/patch_via.c
index 93fcea045e3b..5ef14dd7a568 100644
--- a/sound/pci/hda/patch_via.c
+++ b/sound/pci/hda/patch_via.c
@@ -128,6 +128,7 @@ struct via_spec {
         struct hda_multi_out multiout;
         hda_nid_t slave_dig_outs[2];
         hda_nid_t hp_dac_nid;
+        bool hp_indep_shared;   /* indep HP-DAC is shared with side ch */
         int num_active_streams;
 
         struct nid_path out_path[4];
@@ -714,19 +715,33 @@ static int via_independent_hp_put(struct snd_kcontrol *kcontrol,
 {
         struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
         struct via_spec *spec = codec->spec;
+        int cur;
 
-        spec->hp_independent_mode = !!ucontrol->value.enumerated.item[0];
-        if (spec->hp_independent_mode) {
+        /* no independent-hp status change during PCM playback is running */
+        if (spec->num_active_streams)
+                return -EBUSY;
+
+        cur = !!ucontrol->value.enumerated.item[0];
+        if (spec->hp_independent_mode == cur)
+                return 0;
+        spec->hp_independent_mode = cur;
+        if (cur) {
                 activate_output_path(codec, &spec->hp_dep_path, false, false);
                 activate_output_path(codec, &spec->hp_path, true, false);
+                if (spec->hp_indep_shared)
+                        activate_output_path(codec, &spec->out_path[HDA_SIDE],
+                                             false, false);
         } else {
                 activate_output_path(codec, &spec->hp_path, false, false);
                 activate_output_path(codec, &spec->hp_dep_path, true, false);
+                if (spec->hp_indep_shared)
+                        activate_output_path(codec, &spec->out_path[HDA_SIDE],
+                                             true, false);
         }
 
         /* update jack power state */
         set_widgets_power_state(codec);
-        return 0;
+        return 1;
 }
 
 static const struct snd_kcontrol_new via_hp_mixer = {
@@ -942,10 +957,19 @@ static int via_playback_multi_pcm_open(struct hda_pcm_stream *hinfo,
                                  struct snd_pcm_substream *substream)
 {
         struct via_spec *spec = codec->spec;
+        const struct auto_pin_cfg *cfg = &spec->autocfg;
         int err;
 
-        if (!spec->hp_independent_mode)
-                spec->multiout.hp_nid = spec->hp_dac_nid;
+        spec->multiout.hp_nid = 0;
+        spec->multiout.num_dacs = cfg->line_outs + spec->smart51_nums;
+        if (!spec->hp_independent_mode) {
+                if (!spec->hp_indep_shared)
+                        spec->multiout.hp_nid = spec->hp_dac_nid;
+        } else {
+                if (spec->hp_indep_shared)
+                        spec->multiout.num_dacs = cfg->line_outs - 1;
+        }
+        spec->multiout.max_channels = spec->multiout.num_dacs * 2;
         set_stream_active(codec, true);
         err = snd_hda_multi_out_analog_open(codec, &spec->multiout, substream,
                                             hinfo);
@@ -1815,13 +1839,20 @@ static int via_auto_create_hp_ctls(struct hda_codec *codec, hda_nid_t pin)
 
         if (parse_output_path(codec, pin, 0, &spec->hp_path))
                 spec->hp_dac_nid = spec->hp_path.path[0];
+        else if (spec->multiout.dac_nids[HDA_SIDE] &&
+                 parse_output_path(codec, pin,
+                                   spec->multiout.dac_nids[HDA_SIDE],
+                                   &spec->hp_path)) {
+                spec->hp_dac_nid = spec->hp_path.path[0];
+                spec->hp_indep_shared = true;
+        }
 
         if (!parse_output_path(codec, pin, spec->multiout.dac_nids[HDA_FRONT],
                                &spec->hp_dep_path) &&
             !spec->hp_dac_nid)
                 return 0;
 
-        if (spec->hp_dac_nid)
+        if (spec->hp_dac_nid && !spec->hp_indep_shared)
                 path = &spec->hp_path;
         else
                 path = &spec->hp_dep_path;