3 files changed, 30 insertions, 3 deletions

diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c
index c2c65f63bf06..0ae6eb20b13b 100644
--- a/sound/pci/hda/hda_codec.c
+++ b/sound/pci/hda/hda_codec.c
@@ -1759,7 +1759,11 @@ static void put_vol_mute(struct hda_codec *codec, struct hda_amp_info *info,
         parm = ch ? AC_AMP_SET_RIGHT : AC_AMP_SET_LEFT;
         parm |= direction == HDA_OUTPUT ? AC_AMP_SET_OUTPUT : AC_AMP_SET_INPUT;
         parm |= index << AC_AMP_SET_INDEX_SHIFT;
-        parm |= val;
+        if ((val & HDA_AMP_MUTE) && !(info->amp_caps & AC_AMPCAP_MUTE) &&
+            (info->amp_caps & AC_AMPCAP_MIN_MUTE))
+                ; /* set the zero value as a fake mute */
+        else
+                parm |= val;
         snd_hda_codec_write(codec, nid, 0, AC_VERB_SET_AMP_GAIN_MUTE, parm);
         info->vol[ch] = val;
 }
@@ -2026,7 +2030,7 @@ int snd_hda_mixer_amp_tlv(struct snd_kcontrol *kcontrol, int op_flag,
         val1 = -((caps & AC_AMPCAP_OFFSET) >> AC_AMPCAP_OFFSET_SHIFT);
         val1 += ofs;
         val1 = ((int)val1) * ((int)val2);
-        if (min_mute)
+        if (min_mute || (caps & AC_AMPCAP_MIN_MUTE))
                 val2 |= TLV_DB_SCALE_MUTE;
         if (put_user(SNDRV_CTL_TLVT_DB_SCALE, _tlv))
                 return -EFAULT;
diff --git a/sound/pci/hda/hda_codec.h b/sound/pci/hda/hda_codec.h
index e9f71dc0d464..f0f1943a4b2c 100644
--- a/sound/pci/hda/hda_codec.h
+++ b/sound/pci/hda/hda_codec.h
@@ -298,6 +298,9 @@ enum {
 #define AC_AMPCAP_MUTE                  (1<<31)    /* mute capable */
 #define AC_AMPCAP_MUTE_SHIFT            31
 
+/* driver-specific amp-caps: using bits 24-30 */
+#define AC_AMPCAP_MIN_MUTE              (1 << 30) /* min-volume = mute */
+
 /* Connection list */
 #define AC_CLIST_LENGTH                 (0x7f<<0)
 #define AC_CLIST_LONG                   (1<<7)
diff --git a/sound/pci/hda/patch_conexant.c b/sound/pci/hda/patch_conexant.c
index a7a5733aa4d2..ca117cf5132f 100644
--- a/sound/pci/hda/patch_conexant.c
+++ b/sound/pci/hda/patch_conexant.c
@@ -4079,7 +4079,8 @@ static int cx_auto_add_volume_idx(struct hda_codec *codec, const char *basename,
                 err = snd_hda_ctl_add(codec, nid, kctl);
                 if (err < 0)
                         return err;
-                if (!(query_amp_caps(codec, nid, hda_dir) & AC_AMPCAP_MUTE))
+                if (!(query_amp_caps(codec, nid, hda_dir) &
+                      (AC_AMPCAP_MUTE | AC_AMPCAP_MIN_MUTE)))
                         break;
         }
         return 0;
@@ -4379,6 +4380,22 @@ static const struct snd_pci_quirk cxt_fixups[] = {
         {}
 };
 
+/* add "fake" mute amp-caps to DACs on cx5051 so that mixer mute switches
+ * can be created (bko#42825)
+ */
+static void add_cx5051_fake_mutes(struct hda_codec *codec)
+{
+        static hda_nid_t out_nids[] = {
+                0x10, 0x11, 0
+        };
+        hda_nid_t *p;
+
+        for (p = out_nids; *p; p++)
+                snd_hda_override_amp_caps(codec, *p, HDA_OUTPUT,
+                                          AC_AMPCAP_MIN_MUTE |
+                                          query_amp_caps(codec, *p, HDA_OUTPUT));
+}
+
 static int patch_conexant_auto(struct hda_codec *codec)
 {
         struct conexant_spec *spec;
@@ -4397,6 +4414,9 @@ static int patch_conexant_auto(struct hda_codec *codec)
         case 0x14f15045:
                 spec->single_adc_amp = 1;
                 break;
+        case 0x14f15051:
+                add_cx5051_fake_mutes(codec);
+                break;
         }
 
         apply_pin_fixup(codec, cxt_fixups, cxt_pincfg_tbl);