linux-kernel - Re: [PATCH 1/6] sound/pci/hda: Fix Amp-In count for widgets with implied selector

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Date:	Thu, 05 Apr 2012 16:28:28 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	Michael Karcher <kernel@...rcher.dialup.fu-berlin.de>
Cc:	Jaroslav Kysela <perex@...ex.cz>, alsa-devel@...a-project.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/6] sound/pci/hda: Fix Amp-In count for widgets with implied selector

At Thu, 05 Apr 2012 15:29:56 +0200,
Michael Karcher wrote:
> 
> A selector widget with AC_WCAP_IN_AMP has multiple input amplifiers (if
> the selector widget would have only one common amp, it would be labeled
> as "output amplifier" instead). This is just like mixer widgets.
> 
> If a non-mixer/selector widget has an input amplifier, it is only one
> input amplifier, even if it has a connection list with more than one
> entry. The implied selector is placed before the single input amplifier.
> 
> At least that is how I read the HDA specs, and what Conexant implements in
> their CX20549 codec.

It's rather cx20549-specific behavior.  If you take a look at the BIOS
auto-parser, spec->single_adc_amp is set as a workaround.

Yes, the proc file output should be fixed as well, but you can't
change it globally for all codecs.


Takashi

> diff --git a/sound/pci/hda/hda_proc.c b/sound/pci/hda/hda_proc.c
> index 254ab52..9b942f0 100644
> --- a/sound/pci/hda/hda_proc.c
> +++ b/sound/pci/hda/hda_proc.c
> @@ -653,7 +653,7 @@ static void print_codec_info(struct snd_info_entry *entry,
>  			snd_iprintf(buffer, "  Amp-In vals: ");
>  			print_amp_vals(buffer, codec, nid, HDA_INPUT,
>  				       wid_caps & AC_WCAP_STEREO,
> -				       wid_type == AC_WID_PIN ? 1 : conn_len);
> +				       (wid_type == AC_WID_AUD_SEL || wid_type == AC_WID_AUD_MIX) ? conn_len : 1);
>  		}
>  		if (wid_caps & AC_WCAP_OUT_AMP) {
>  			snd_iprintf(buffer, "  Amp-Out caps: ");
> -- 
> 1.7.9.1
> 
> 
> 
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