linux-kernel - Re: [GIT PULL] sound fixes

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Date:	Fri, 22 May 2009 23:25:47 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [GIT PULL] sound fixes

At Fri, 22 May 2009 13:47:52 -0700 (PDT),
Linus Torvalds wrote:
> 
> 
> 
> On Fri, 22 May 2009, Takashi Iwai wrote:
> > 
> > please pull ALSA updates for v2.6.30-rc6 from:
> > 
> >   git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6.git for-linus
> > 
> > containing just the following trivial fixes.
> 
> Thanks, pulled.
> 
> I also note that you've been active on
> 
> 	http://bugzilla.kernel.org/show_bug.cgi?id=13250
> 
> but quite frankly, my opinion is that the workaround listed there isn't a 
> fix at all. Why isn't such a frontpanel configuration choice exported as a 
> switch, so that you can access it with alsamixer, rather than playing 
> crazy games with some magic sysfs files?
> 
> If it cannot be autodetected, it should still be visible as a mixer 
> option, not some magic. No?

Yeah, the method I suggested there is a typical "debug" procedure
and no right "fix" yet.

[Short background:
 Basically the HD-audio is designed in a way that BIOS could specify
 the proper h/w configuration, and the driver needs just to follow
 that.  The problem now is when the hardware doesn't match really with
 what BIOS assumes -- i.e. the driver is fooled.  In the bug above, the
 box isn't connected to the front panel as BIOS expected.  And, a
 recent fix for the Headphone volume control appears now as if a
 regression for his use case.]

We can of course add some mixer element to change the DAC assignment.
Some codecs have a mixer "Channel Mode" to change the surround mode.
In a similar way, the front HP / mic could be changed.  But, the
implementation in patch_sigmatel.c is a bit complex to put such a
mixer element into the middle, so I'm afraid it would be a bit risky
at this stage.

Alternatively, what we did in most cases for such a case are to create
a specific quirk and let user pass via model option.  For this
particular case, this would be a simpler fix because basically we just
need to give a new pin-config map like an (untested) patch below.

Anyway, I'll follow up the bug there with that patch...

thanks,

Takashi

---
diff --git a/sound/pci/hda/patch_sigmatel.c b/sound/pci/hda/patch_sigmatel.c
index 03b3646..922d05e 100644
--- a/sound/pci/hda/patch_sigmatel.c
+++ b/sound/pci/hda/patch_sigmatel.c
@@ -150,6 +150,7 @@ enum {
 	STAC_D965_REF,
 	STAC_D965_3ST,
 	STAC_D965_5ST,
+	STAC_D965_5ST_NO_FP,
 	STAC_DELL_3ST,
 	STAC_DELL_BIOS,
 	STAC_927X_MODELS
@@ -2154,6 +2155,13 @@ static unsigned int d965_5st_pin_configs[14] = {
 	0x40000100, 0x40000100
 };

+static unsigned int d965_5st_no_fp_pin_configs[14] = {
+	0x40000100, 0x40000100, 0x0181304e, 0x01014010,
+	0x01a19040, 0x01011012, 0x01016011, 0x40000100,
+	0x40000100, 0x40000100, 0x40000100, 0x01442070,
+	0x40000100, 0x40000100
+};
+
 static unsigned int dell_3st_pin_configs[14] = {
 	0x02211230, 0x02a11220, 0x01a19040, 0x01114210,
 	0x01111212, 0x01116211, 0x01813050, 0x01112214,
@@ -2166,6 +2174,7 @@ static unsigned int *stac927x_brd_tbl[STAC_927X_MODELS] = {
 	[STAC_D965_REF]  = ref927x_pin_configs,
 	[STAC_D965_3ST]  = d965_3st_pin_configs,
 	[STAC_D965_5ST]  = d965_5st_pin_configs,
+	[STAC_D965_5ST_NO_FP]  = d965_5st_no_fp_pin_configs,
 	[STAC_DELL_3ST]  = dell_3st_pin_configs,
 	[STAC_DELL_BIOS] = NULL,
 };
@@ -2176,6 +2185,7 @@ static const char *stac927x_models[STAC_927X_MODELS] = {
 	[STAC_D965_REF]		= "ref",
 	[STAC_D965_3ST]		= "3stack",
 	[STAC_D965_5ST]		= "5stack",
+	[STAC_D965_5ST_NO_FP]	= "5stack-no-fp",
 	[STAC_DELL_3ST]		= "dell-3stack",
 	[STAC_DELL_BIOS]	= "dell-bios",
 };
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