ALSA: hda - Allow to enable/disable vmaster build explicitly

Another preliminary patch for the dual-codec support: since the
support of vmaster over multiple codecs is difficult, simply disable
it by a new flag to hda_codec struct.  A new user hint is added as
well for consistency.

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

3 files changed, 8 insertions, 2 deletions

diff --git a/Documentation/sound/hd-audio/notes.rst b/Documentation/sound/hd-audio/notes.rst
index 9eeb9b468706..f59c3cdbfaf4 100644
--- a/Documentation/sound/hd-audio/notes.rst
+++ b/Documentation/sound/hd-audio/notes.rst
@@ -494,6 +494,8 @@ add_hp_mic (bool)
 hp_mic_detect (bool)
     enable/disable the hp/mic shared input for a single built-in mic
     case; default true
+vmaster (bool)
+    enable/disable the virtual Master control; default true
 mixer_nid (int)
     specifies the widget NID of the analog-loopback mixer
 
diff --git a/sound/pci/hda/hda_generic.c b/sound/pci/hda/hda_generic.c
index 443832870a44..2842c82363c0 100644
--- a/sound/pci/hda/hda_generic.c
+++ b/sound/pci/hda/hda_generic.c
@@ -196,6 +196,9 @@ static void parse_user_hints(struct hda_codec *codec)
         val = snd_hda_get_bool_hint(codec, "hp_mic_detect");
         if (val >= 0)
                 spec->suppress_hp_mic_detect = !val;
+        val = snd_hda_get_bool_hint(codec, "vmaster");
+        if (val >= 0)
+                spec->suppress_vmaster = !val;
 
         if (!snd_hda_get_int_hint(codec, "mixer_nid", &val))
                 spec->mixer_nid = val;
@@ -5033,7 +5036,7 @@ int snd_hda_gen_build_controls(struct hda_codec *codec)
         }
 
         /* if we have no master control, let's create it */
-        if (!spec->no_analog &&
+        if (!spec->no_analog && !spec->suppress_vmaster &&
             !snd_hda_find_mixer_ctl(codec, "Master Playback Volume")) {
                 err = snd_hda_add_vmaster(codec, "Master Playback Volume",
                                           spec->vmaster_tlv, slave_pfxs,
@@ -5041,7 +5044,7 @@ int snd_hda_gen_build_controls(struct hda_codec *codec)
                 if (err < 0)
                         return err;
         }
-        if (!spec->no_analog &&
+        if (!spec->no_analog && !spec->suppress_vmaster &&
             !snd_hda_find_mixer_ctl(codec, "Master Playback Switch")) {
                 err = __snd_hda_add_vmaster(codec, "Master Playback Switch",
                                             NULL, slave_pfxs,
diff --git a/sound/pci/hda/hda_generic.h b/sound/pci/hda/hda_generic.h
index f66fc7e25e07..61772317de46 100644
--- a/sound/pci/hda/hda_generic.h
+++ b/sound/pci/hda/hda_generic.h
@@ -229,6 +229,7 @@ struct hda_gen_spec {
         unsigned int add_jack_modes:1; /* add i/o jack mode enum ctls */
         unsigned int power_down_unused:1; /* power down unused widgets */
         unsigned int dac_min_mute:1; /* minimal = mute for DACs */
+        unsigned int suppress_vmaster:1; /* don't create vmaster kctls */
 
         /* other internal flags */
         unsigned int no_analog:1; /* digital I/O only */