[ALSA] hda-codec - Revert volume knob controls in STAC codecs

Volume knob controls with STAC codecs seem to cause problems with some
devices.  Volumes change very slowly or silent suddenly.  It's likely
due to conflict between the software and the hardware volume knob
setup.
Since we'll have a virtual master control in future, it's safer to
remove this control completely right now.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>

sound/pci/hda/patch_sigmatel.c

@@ -374,42 +374,6 @@ static int stac92xx_aloopback_put(struct snd_kcontrol *kcontrol,
 	return 1;
 }
 
-static int stac92xx_volknob_info(struct snd_kcontrol *kcontrol,
-	struct snd_ctl_elem_info *uinfo)
-{
-	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
-	uinfo->count = 1;
-	uinfo->value.integer.min = 0;
-	uinfo->value.integer.max = 127;
-	return 0;
-}
-
-static int stac92xx_volknob_get(struct snd_kcontrol *kcontrol,
-	struct snd_ctl_elem_value *ucontrol)
-{
-	ucontrol->value.integer.value[0] = kcontrol->private_value & 0xff;
-	return 0;
-}
-
-static int stac92xx_volknob_put(struct snd_kcontrol *kcontrol,
-		struct snd_ctl_elem_value *ucontrol)
-{
-	struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
-	unsigned int oval = kcontrol->private_value & 0xff;
-	unsigned int val;
-
-	val = ucontrol->value.integer.value[0] & 0xff;
-	if (val == oval)
-		return 0;
-
-	kcontrol->private_value &= ~0xff;
-	kcontrol->private_value |= val;
-
-	snd_hda_codec_write_cache(codec, kcontrol->private_value >> 16, 0,
-		AC_VERB_SET_VOLUME_KNOB_CONTROL, val | 0x80);
-	return 1;
-}
-
 static struct hda_verb stac9200_core_init[] = {
 	/* set dac0mux for dac converter */
 	{ 0x07, AC_VERB_SET_CONNECT_SEL, 0x00},
@@ -507,17 +471,6 @@ static struct hda_verb stac9205_core_init[] = {
 		.private_value = verb_read | (verb_write << 16), \
 	}
 
-#define STAC_VOLKNOB(knob_nid)	\
-	{ \
-		.iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
-		.name  = "Master Playback Volume", \
-		.count = 1, \
-		.info  = stac92xx_volknob_info, \
-		.get   = stac92xx_volknob_get, \
-		.put   = stac92xx_volknob_put, \
-			.private_value = 127 | (knob_nid << 16), \
-	}
-
 static struct snd_kcontrol_new stac9200_mixer[] = {
 	HDA_CODEC_VOLUME("Master Playback Volume", 0xb, 0, HDA_OUTPUT),
 	HDA_CODEC_MUTE("Master Playback Switch", 0xb, 0, HDA_OUTPUT),
@@ -531,7 +484,6 @@ static struct snd_kcontrol_new stac9200_mixer[] = {
 static struct snd_kcontrol_new stac92hd71bxx_mixer[] = {
 	STAC_DIGITAL_INPUT_SOURCE(1),
 	STAC_INPUT_SOURCE(2),
-	STAC_VOLKNOB(0x28),
 
 	/* hardware gain controls */
 	HDA_CODEC_VOLUME_IDX("Digital Mic Volume", 0x0, 0x18, 0x0, HDA_OUTPUT),