ALSA: hda - Treat stereo-to-mono mix properly

The commit [ef403edb7558: ALSA: hda - Don't access stereo amps for
mono channel widgets] fixed the handling of mono widgets in general,
but it still misses an exceptional case: namely, a mono mixer widget
taking a single stereo input.  In this case, it has stereo volumes
although it's a mono widget, and thus we have to take care of both
left and right input channels, as stated in HD-audio spec ("7.1.3
Widget Interconnection Rules").

This patch covers this missing piece by adding proper checks of stereo
amps in both the generic parser and the proc output codes.

Reported-by: Raymond Yau <superquad.vortex2@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/pci/hda/hda_generic.c b/sound/pci/hda/hda_generic.c
index fe18071..8ec5289 100644 (file)
--- a/sound/pci/hda/hda_generic.c
+++ b/sound/pci/hda/hda_generic.c
@@ -687,13 +687,30 @@ static int get_amp_val_to_activate(struct hda_codec *codec, hda_nid_t nid,
        return val;
 }
 
+/* is this a stereo widget or a stereo-to-mono mix? */
+static bool is_stereo_amps(struct hda_codec *codec, hda_nid_t nid, int dir)
+{
+       unsigned int wcaps = get_wcaps(codec, nid);
+       hda_nid_t conn;
+
+       if (wcaps & AC_WCAP_STEREO)
+               return true;
+       if (dir != HDA_INPUT || get_wcaps_type(wcaps) != AC_WID_AUD_MIX)
+               return false;
+       if (snd_hda_get_num_conns(codec, nid) != 1)
+               return false;
+       if (snd_hda_get_connections(codec, nid, &conn, 1) < 0)
+               return false;
+       return !!(get_wcaps(codec, conn) & AC_WCAP_STEREO);
+}
+
 /* initialize the amp value (only at the first time) */
 static void init_amp(struct hda_codec *codec, hda_nid_t nid, int dir, int idx)
 {
        unsigned int caps = query_amp_caps(codec, nid, dir);
        int val = get_amp_val_to_activate(codec, nid, dir, caps, false);
 
-       if (get_wcaps(codec, nid) & AC_WCAP_STEREO)
+       if (is_stereo_amps(codec, nid, dir))
                snd_hda_codec_amp_init_stereo(codec, nid, dir, idx, 0xff, val);
        else
                snd_hda_codec_amp_init(codec, nid, 0, dir, idx, 0xff, val);
@@ -703,7 +720,7 @@ static void init_amp(struct hda_codec *codec, hda_nid_t nid, int dir, int idx)
 static int update_amp(struct hda_codec *codec, hda_nid_t nid, int dir, int idx,
                      unsigned int mask, unsigned int val)
 {
-       if (get_wcaps(codec, nid) & AC_WCAP_STEREO)
+       if (is_stereo_amps(codec, nid, dir))
                return snd_hda_codec_amp_stereo(codec, nid, dir, idx,
                                                mask, val);
        else

diff --git a/sound/pci/hda/hda_proc.c b/sound/pci/hda/hda_proc.c
index ce5a6da..05e19f7 100644 (file)
--- a/sound/pci/hda/hda_proc.c
+++ b/sound/pci/hda/hda_proc.c
@@ -134,13 +134,38 @@ static void print_amp_caps(struct snd_info_buffer *buffer,
                    (caps & AC_AMPCAP_MUTE) >> AC_AMPCAP_MUTE_SHIFT);
 }
 
+/* is this a stereo widget or a stereo-to-mono mix? */
+static bool is_stereo_amps(struct hda_codec *codec, hda_nid_t nid,
+                          int dir, unsigned int wcaps, int indices)
+{
+       hda_nid_t conn;
+
+       if (wcaps & AC_WCAP_STEREO)
+               return true;
+       /* check for a stereo-to-mono mix; it must be:
+        * only a single connection, only for input, and only a mixer widget
+        */
+       if (indices != 1 || dir != HDA_INPUT ||
+           get_wcaps_type(wcaps) != AC_WID_AUD_MIX)
+               return false;
+
+       if (snd_hda_get_raw_connections(codec, nid, &conn, 1) < 0)
+               return false;
+       /* the connection source is a stereo? */
+       wcaps = snd_hda_param_read(codec, conn, AC_PAR_AUDIO_WIDGET_CAP);
+       return !!(wcaps & AC_WCAP_STEREO);
+}
+
 static void print_amp_vals(struct snd_info_buffer *buffer,
                           struct hda_codec *codec, hda_nid_t nid,
-                          int dir, int stereo, int indices)
+                          int dir, unsigned int wcaps, int indices)
 {
        unsigned int val;
+       bool stereo;
        int i;
 
+       stereo = is_stereo_amps(codec, nid, dir, wcaps, indices);
+
        dir = dir == HDA_OUTPUT ? AC_AMP_GET_OUTPUT : AC_AMP_GET_INPUT;
        for (i = 0; i < indices; i++) {
                snd_iprintf(buffer, " [");
@@ -757,12 +782,10 @@ static void print_codec_info(struct snd_info_entry *entry,
                            (codec->single_adc_amp &&
                             wid_type == AC_WID_AUD_IN))
                                print_amp_vals(buffer, codec, nid, HDA_INPUT,
-                                              wid_caps & AC_WCAP_STEREO,
-                                              1);
+                                              wid_caps, 1);
                        else
                                print_amp_vals(buffer, codec, nid, HDA_INPUT,
-                                              wid_caps & AC_WCAP_STEREO,
-                                              conn_len);
+                                              wid_caps, conn_len);
                }
                if (wid_caps & AC_WCAP_OUT_AMP) {
                        snd_iprintf(buffer, "  Amp-Out caps: ");
@@ -771,11 +794,10 @@ static void print_codec_info(struct snd_info_entry *entry,
                        if (wid_type == AC_WID_PIN &&
                            codec->pin_amp_workaround)
                                print_amp_vals(buffer, codec, nid, HDA_OUTPUT,
-                                              wid_caps & AC_WCAP_STEREO,
-                                              conn_len);
+                                              wid_caps, conn_len);
                        else
                                print_amp_vals(buffer, codec, nid, HDA_OUTPUT,
-                                              wid_caps & AC_WCAP_STEREO, 1);
+                                              wid_caps, 1);
                }
 
                switch (wid_type) {