Comment 28 for bug 1037642

At Thu, 20 Sep 2012 15:41:21 +0200,
David Henningsson wrote:
>
> On the Thinkpad W520 - and probably several other machines with
> Conexant 506x chips - the Dock Mic and Mic are connected to the
> same two selector nodes. This patch will make Dock Mic take one
> selector node and Mic take the other, when possible.
>
> Without the patch, both paths would take the first selector,
> leading to the normal Mic's volume being controlled by
> "Dock Mic Boost".
> (On other machines, this could instead fixup similar problems between
> Mic and Line In, for example.)
>
> BugLink: https://bugs.launchpad.net/bugs/1037642
> Signed-off-by: David Henningsson <email address hidden>

Applied now, thanks.

> ---
>
> I asked for alsa-info on this one but got Ubuntu apport info instead,
> see e g
> https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/1037642/+attachment/3323954/+files/Card0.Codecs.codec.0.txt
>
> In general I guess this could be sent to stable but it always feels scary
> when it's generic code :-) what do you think?

I think it doesn't need to be in stable in this case, as this will
result in the mixer element renames. If anything is missing, it'd be
good to fix in stable. But, this is a mis-assigned name, but still
controllable.

Takashi

>
> sound/pci/hda/patch_conexant.c | 20 ++++++++++++++++----
> 1 file changed, 16 insertions(+), 4 deletions(-)
>
> diff --git a/sound/pci/hda/patch_conexant.c b/sound/pci/hda/patch_conexant.c
> index b871b013..c03d3b8 100644
> --- a/sound/pci/hda/patch_conexant.c
> +++ b/sound/pci/hda/patch_conexant.c
> @@ -3540,8 +3540,9 @@ static int __select_input_connection(struct hda_codec *codec, hda_nid_t mux,
> hda_nid_t pin, hda_nid_t *srcp,
> bool do_select, int depth)
> {
> + struct conexant_spec *spec = codec->spec;
> hda_nid_t conn[HDA_MAX_NUM_INPUTS];
> - int i, nums;
> + int startidx, i, nums;
>
> switch (get_wcaps_type(get_wcaps(codec, mux))) {
> case AC_WID_AUD_IN:
> @@ -3565,14 +3566,25 @@ static int __select_input_connection(struct hda_codec *codec, hda_nid_t mux,
> depth++;
> if (depth == 2)
> return -1;
> +
> + /* Try to rotate around connections to avoid one boost controlling
> + another input path as well */
> + startidx = 0;
> + for (i = 0; i < spec->private_imux.num_items; i++)
> + if (spec->imux_info[i].pin == pin) {
> + startidx = i;
> + break;
> + }
> +
> for (i = 0; i < nums; i++) {
> - int ret = __select_input_connection(codec, conn[i], pin, srcp,
> + int j = (i + startidx) % nums;
> + int ret = __select_input_connection(codec, conn[j], pin, srcp,
> do_select, depth);
> if (ret >= 0) {
> if (do_select)
> snd_hda_codec_write(codec, mux, 0,
> - AC_VERB_SET_CONNECT_SEL, i);
> - return i;
> + AC_VERB_SET_CONNECT_SEL, j);
> + return j;
> }
> }
> return -1;
> --
> 1.7.9.5
>