ALSA: hda - Re-add the lost fake mute support

Yet another regression by the transition to regmap cache; for better
usability, we had the fake mute control using the zero amp value for
Conexant codecs, and this was forgotten in the new hda core code.

Since the bits 4-7 are unused for the amp registers (as we follow the
syntax of AMP_GET verb), the bit 4 is now used to indicate the fake
mute.  For setting this flag, snd_hda_codec_amp_update() becomes a
function from a simple macro.  The bonus is that it gained a proper
function description.
Signed-off-by: Takashi Iwai <tiwai@suse.de>

include/sound/hda_regmap.h

@@ -9,6 +9,8 @@
 #include <sound/core.h>
 #include <sound/hdaudio.h>
 
+#define AC_AMP_FAKE_MUTE	0x10	/* fake mute bit set to amp verbs */
+
 int snd_hdac_regmap_init(struct hdac_device *codec);
 void snd_hdac_regmap_exit(struct hdac_device *codec);
 int snd_hdac_regmap_add_vendor_verb(struct hdac_device *codec,

sound/hda/hdac_regmap.c

@@ -246,6 +246,9 @@ static int hda_reg_read(void *context, unsigned int reg, unsigned int *val)
 		return hda_reg_read_stereo_amp(codec, reg, val);
 	if (verb == AC_VERB_GET_PROC_COEF)
 		return hda_reg_read_coef(codec, reg, val);
+	if ((verb & 0x700) == AC_VERB_SET_AMP_GAIN_MUTE)
+		reg &= ~AC_AMP_FAKE_MUTE;
+
 	err = snd_hdac_exec_verb(codec, reg, 0, val);
 	if (err < 0)
 		return err;
@@ -283,6 +286,8 @@ static int hda_reg_write(void *context, unsigned int reg, unsigned int val)
 
 	switch (verb & 0xf00) {
 	case AC_VERB_SET_AMP_GAIN_MUTE:
+		if ((reg & AC_AMP_FAKE_MUTE) && (val & AC_AMP_MUTE))
+			val = 0;
 		verb = AC_VERB_SET_AMP_GAIN_MUTE;
 		if (reg & AC_AMP_GET_LEFT)
 			verb |= AC_AMP_SET_LEFT >> 8;

sound/pci/hda/hda_codec.c

@@ -1375,6 +1375,31 @@ int snd_hda_override_amp_caps(struct hda_codec *codec, hda_nid_t nid, int dir,
 }
 EXPORT_SYMBOL_GPL(snd_hda_override_amp_caps);
 
+/**
+ * snd_hda_codec_amp_update - update the AMP mono value
+ * @codec: HD-audio codec
+ * @nid: NID to read the AMP value
+ * @ch: channel to update (0 or 1)
+ * @dir: #HDA_INPUT or #HDA_OUTPUT
+ * @idx: the index value (only for input direction)
+ * @mask: bit mask to set
+ * @val: the bits value to set
+ *
+ * Update the AMP values for the given channel, direction and index.
+ */
+int snd_hda_codec_amp_update(struct hda_codec *codec, hda_nid_t nid,
+			     int ch, int dir, int idx, int mask, int val)
+{
+	unsigned int cmd = snd_hdac_regmap_encode_amp(nid, ch, dir, idx);
+
+	/* enable fake mute if no h/w mute but min=mute */
+	if ((query_amp_caps(codec, nid, dir) &
+	     (AC_AMPCAP_MUTE | AC_AMPCAP_MIN_MUTE)) == AC_AMPCAP_MIN_MUTE)
+		cmd |= AC_AMP_FAKE_MUTE;
+	return snd_hdac_regmap_update_raw(&codec->core, cmd, mask, val);
+}
+EXPORT_SYMBOL_GPL(snd_hda_codec_amp_update);
+
 /**
  * snd_hda_codec_amp_stereo - update the AMP stereo values
  * @codec: HD-audio codec

sound/pci/hda/hda_local.h

@@ -129,8 +129,8 @@ int snd_hda_mixer_amp_switch_put_beep(struct snd_kcontrol *kcontrol,
 /* lowlevel accessor with caching; use carefully */
 #define snd_hda_codec_amp_read(codec, nid, ch, dir, idx) \
 	snd_hdac_regmap_get_amp(&(codec)->core, nid, ch, dir, idx)
-#define snd_hda_codec_amp_update(codec, nid, ch, dir, idx, mask, val) \
-	snd_hdac_regmap_update_amp(&(codec)->core, nid, ch, dir, idx, mask, val)
+int snd_hda_codec_amp_update(struct hda_codec *codec, hda_nid_t nid,
+			     int ch, int dir, int idx, int mask, int val);
 int snd_hda_codec_amp_stereo(struct hda_codec *codec, hda_nid_t nid,
 			     int dir, int idx, int mask, int val);
 int snd_hda_codec_amp_init(struct hda_codec *codec, hda_nid_t nid, int ch,