[alsa-devel] [PATCH 1/1] ALSA: hda - bug fix for invalid connection list of Haswell HDMI codec pin

Lin, Mengdong mengdong.lin at intel.com
Fri Dec 14 08:26:28 CET 2012

> -----Original Message-----
> From: alsa-devel-bounces at alsa-project.org
> [mailto:alsa-devel-bounces at alsa-project.org] On Behalf Of Takashi Iwai
> Sent: Friday, December 14, 2012 3:10 PM

> > +static void intel_haswell_fixup_connect_list(struct hda_codec *codec,
> > +			       const struct hda_fixup *fix, int action) {
> > +	hda_nid_t list[3] = {0x2, 0x3, 0x4};
> > +	unsigned int vendor_param;
> > +
> > +	if (action != HDA_FIXUP_ACT_PROBE)
> > +		return;
> Is this ACT_PROBE, that is, applied only after parsing the codec?
> Usually a fixup for overriding the connection list is applied before parsing the
> tree.

Yes, this fixup is applied after parsing the codec.
Because during parsing, the pin nid#6 may still report invalid connection list entries 0x00000000
in snd_hda_get_raw_connections(), which should be 0x00040302 to stand for 3 output convertors.
So we need to overwrite its connection list with the proper value.

But, do you mean we can change this to the pre-probe stage, so that snd_hda_get_raw_connections()
need not be called during the parsing the codec? I'll do a test.


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