The internal mic input is phase inverted on one channel. To avoid people in userspace summing the channels together and get zero result, use a separate mixer control for the inverted channel.
BugLink: https://bugs.launchpad.net/bugs/903853 Signed-off-by: David Henningsson david.henningsson@canonical.com ---
Inverted Internal Mic, take 2.
I refined my idea a little. By calling the left channel "Internal Mic" and the right channel "Inverted Internal Mic", we're giving the user a choice whether to activate it or keeping it muted.
For PulseAudio, the quick fix is just to make sure the "Inverted Internal Mic" control is muted. If we in the long run want to actually handle this and swap the phase around, we now also have a reasonable indicator if we should do this, by checking if the "Inverted Internal Mic" control exists.
For the ALSA init DB (i e, should the "Inverted Internal Mic" be initially muted?) that is no big deal for me, since this will be overwritten by PulseAudio later anyway.
I'm also open for better names than "Inverted Internal Mic" if you have any.
As with the previous version, this is a draft version of the patch, and could be done slightly more elegant I guess.
What do you say?
sound/pci/hda/patch_conexant.c | 45 +++++++++++++++++++++++++++++---------- 1 files changed, 33 insertions(+), 12 deletions(-)
diff --git a/sound/pci/hda/patch_conexant.c b/sound/pci/hda/patch_conexant.c index e6eafb1..cd3859b 100644 --- a/sound/pci/hda/patch_conexant.c +++ b/sound/pci/hda/patch_conexant.c @@ -142,6 +142,7 @@ struct conexant_spec { unsigned int asus:1; unsigned int pin_eapd_ctrls:1; unsigned int single_adc_amp:1; + unsigned int fixup_stereo_dmic:1;
unsigned int adc_switching:1;
@@ -4107,9 +4108,9 @@ static int cx_auto_init(struct hda_codec *codec)
static int cx_auto_add_volume_idx(struct hda_codec *codec, const char *basename, const char *dir, int cidx, - hda_nid_t nid, int hda_dir, int amp_idx) + hda_nid_t nid, int hda_dir, int amp_idx, int chs) { - static char name[32]; + static char name[44]; static struct snd_kcontrol_new knew[] = { HDA_CODEC_VOLUME(name, 0, 0, 0), HDA_CODEC_MUTE(name, 0, 0, 0), @@ -4119,7 +4120,7 @@ static int cx_auto_add_volume_idx(struct hda_codec *codec, const char *basename,
for (i = 0; i < 2; i++) { struct snd_kcontrol *kctl; - knew[i].private_value = HDA_COMPOSE_AMP_VAL(nid, 3, amp_idx, + knew[i].private_value = HDA_COMPOSE_AMP_VAL(nid, chs, amp_idx, hda_dir); knew[i].subdevice = HDA_SUBDEV_AMP_FLAG; knew[i].index = cidx; @@ -4138,7 +4139,7 @@ static int cx_auto_add_volume_idx(struct hda_codec *codec, const char *basename, }
#define cx_auto_add_volume(codec, str, dir, cidx, nid, hda_dir) \ - cx_auto_add_volume_idx(codec, str, dir, cidx, nid, hda_dir, 0) + cx_auto_add_volume_idx(codec, str, dir, cidx, nid, hda_dir, 0, 3)
#define cx_auto_add_pb_volume(codec, nid, str, idx) \ cx_auto_add_volume(codec, str, " Playback", idx, nid, HDA_OUTPUT) @@ -4216,14 +4217,24 @@ static int cx_auto_add_capture_volume(struct hda_codec *codec, hda_nid_t nid, int i;
for (i = 0; i < spec->num_adc_nids; i++) { + int chs = 3; hda_nid_t adc_nid = spec->adc_nids[i]; int idx = get_input_connection(codec, adc_nid, nid); if (idx < 0) continue; if (spec->single_adc_amp) idx = 0; + + if (spec->fixup_stereo_dmic && (strcmp("Internal Mic", label) == 0)) { + /* Make two independent kcontrols */ + int err = cx_auto_add_volume_idx(codec, "Inverted Internal Mic", pfx, + cidx, adc_nid, HDA_INPUT, idx, 2); + if (err < 0) + return err; + chs = 1; + } return cx_auto_add_volume_idx(codec, label, pfx, - cidx, adc_nid, HDA_INPUT, idx); + cidx, adc_nid, HDA_INPUT, idx, chs); } return 0; } @@ -4405,22 +4416,30 @@ static void apply_pincfg(struct hda_codec *codec, const struct cxt_pincfg *cfg)
}
-static void apply_pin_fixup(struct hda_codec *codec, +enum { + CXT_PINCFG_LENOVO_X200, + CXT_FIXUP_STEREO_DMIC, +}; + +static void apply_fixup(struct hda_codec *codec, const struct snd_pci_quirk *quirk, const struct cxt_pincfg **table) { + struct conexant_spec *spec = codec->spec; + quirk = snd_pci_quirk_lookup(codec->bus->pci, quirk); - if (quirk) { + if (quirk && table[quirk->value]) { snd_printdd(KERN_INFO "hda_codec: applying pincfg for %s\n", quirk->name); apply_pincfg(codec, table[quirk->value]); } + if (quirk->value == CXT_FIXUP_STEREO_DMIC) { + snd_printdd(KERN_INFO "hda_codec: applying internal mic workaround for %s\n", + quirk->name); + spec->fixup_stereo_dmic = 1; + } }
-enum { - CXT_PINCFG_LENOVO_X200, -}; - static const struct cxt_pincfg cxt_pincfg_lenovo_x200[] = { { 0x16, 0x042140ff }, /* HP (seq# overridden) */ { 0x17, 0x21a11000 }, /* dock-mic */ @@ -4431,10 +4450,12 @@ static const struct cxt_pincfg cxt_pincfg_lenovo_x200[] = {
static const struct cxt_pincfg *cxt_pincfg_tbl[] = { [CXT_PINCFG_LENOVO_X200] = cxt_pincfg_lenovo_x200, + [CXT_FIXUP_STEREO_DMIC] = NULL, };
static const struct snd_pci_quirk cxt_fixups[] = { SND_PCI_QUIRK(0x17aa, 0x20f2, "Lenovo X200", CXT_PINCFG_LENOVO_X200), + SND_PCI_QUIRK(0x17aa, 0x3975, "Lenovo U300s", CXT_FIXUP_STEREO_DMIC), {} };
@@ -4477,7 +4498,7 @@ static int patch_conexant_auto(struct hda_codec *codec) break; }
- apply_pin_fixup(codec, cxt_fixups, cxt_pincfg_tbl); + apply_fixup(codec, cxt_fixups, cxt_pincfg_tbl);
/* Show mute-led control only on HP laptops * This is a sort of white-list: on HP laptops, EAPD corresponds