[PATCH] Add Mac mini sound support

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Per Christian Henden

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Apr 9, 2005, 8:00:17 AM4/9/05
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The patch below adds sound support on the Mac Mini by making a small change to the PowerMac sound card detection code.

Details:

Original code:
From sound/ppc/pmac.c __init snd_pmac_detect(pmac_t *chip) :

chip->model = PMAC_AWACS;
...
if (device_is_compatible(sound, "AOAKeylargo")) {
...
chip->model = PMAC_SNAPPER;
...
}

The chip model is first set to AWACS, then because the check above returns true, it gets set to SNAPPER.
Using AWACS gives perfect sound, using SNAPPER gives no sound at all, so it should use AWACS instead.
Note that the mixer still doesn't work.

My simple patch makes the mentioned check return false on a Mac Mini.

Patch against 2.6.12-rc2:

diff -urpN -X dontdiff linux-2.6.12-rc2.orig/sound/ppc/pmac.c linux-2.6.12-rc2/sound/ppc/pmac.c
--- linux-2.6.12-rc2.orig/sound/ppc/pmac.c 2005-04-09 11:59:18.000000000 +0200
+++ linux-2.6.12-rc2/sound/ppc/pmac.c 2005-04-09 12:35:50.000000000 +0200
@@ -904,6 +904,8 @@ static int __init snd_pmac_detect(pmac_t
else if (machine_is_compatible("PowerBook1,1")
|| machine_is_compatible("AAPL,PowerBook1998"))
chip->is_pbook_G3 = 1;
+ else if (machine_is_compatible("PowerMac10,1"))
+ chip->is_macmini = 1;
chip->node = find_devices("awacs");
if (chip->node)
return 0; /* ok */
@@ -961,7 +963,7 @@ static int __init snd_pmac_detect(pmac_t
chip->freq_table = tumbler_freqs;
chip->control_mask = MASK_IEPC | 0x11; /* disable IEE */
}
- if (device_is_compatible(sound, "AOAKeylargo")) {
+ if (device_is_compatible(sound, "AOAKeylargo") && chip->is_macmini!=1) {
/* Seems to support the stock AWACS frequencies, but has
a snapper mixer */
chip->model = PMAC_SNAPPER;
diff -urpN -X dontdiff linux-2.6.12-rc2.orig/sound/ppc/pmac.h linux-2.6.12-rc2/sound/ppc/pmac.h
--- linux-2.6.12-rc2.orig/sound/ppc/pmac.h 2005-03-02 08:38:12.000000000 +0100
+++ linux-2.6.12-rc2/sound/ppc/pmac.h 2005-04-09 12:04:42.000000000 +0200
@@ -110,6 +110,7 @@ struct snd_pmac {
unsigned int has_iic : 1;
unsigned int is_pbook_3400 : 1;
unsigned int is_pbook_G3 : 1;
+ unsigned int is_macmini : 1;

unsigned int can_byte_swap : 1;
unsigned int can_duplex : 1;


-------------

The patch was tested by checking if I got sound support with the patch applied on my Mac Mini.

Thanks to Owen Stampflee at Yellowdog Linux for discovering that sound works when setting chip->model=PMAC_AWACS on the mini.

Please CC replies.

Cheers,
Per Christian Henden
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Benjamin Herrenschmidt

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Apr 9, 2005, 7:40:09 PM4/9/05
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On Sat, 2005-04-09 at 13:51 +0200, Per Christian Henden wrote:
> The patch below adds sound support on the Mac Mini by making a small change to the PowerMac sound card detection code.
>
> Details:
>
> Original code:
> >From sound/ppc/pmac.c __init snd_pmac_detect(pmac_t *chip) :
>
> chip->model = PMAC_AWACS;
> ...
> if (device_is_compatible(sound, "AOAKeylargo")) {
> ...
> chip->model = PMAC_SNAPPER;
> ...
> }
>
> The chip model is first set to AWACS, then because the check above returns true, it gets set to SNAPPER.
> Using AWACS gives perfect sound, using SNAPPER gives no sound at all, so it should use AWACS instead.
> Note that the mixer still doesn't work.
>
> My simple patch makes the mentioned check return false on a Mac Mini.

And is not correct. It might appear to work but it is not the right
thing to do. There is no AWACS chip in there. There is a fixed function
codec controlled by a couple of GPIOs afaik. I'm working on a major
rework of the alsa driver that will include support for the mini and the
G5s.

Ben.

Per Christian Henden

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Apr 11, 2005, 1:30:15 PM4/11/05
to
On Sunday 10 April 2005 01:28, Benjamin Herrenschmidt wrote:
> On Sat, 2005-04-09 at 13:51 +0200, Per Christian Henden wrote:
> > The patch below adds sound support on the Mac Mini by making a small
change to the PowerMac sound card detection code.
[Snip, details]

> And is not correct. It might appear to work but it is not the right
> thing to do. There is no AWACS chip in there. There is a fixed function
> codec controlled by a couple of GPIOs afaik. I'm working on a major
> rework of the alsa driver that will include support for the mini and the
> G5s.

Ok. It /does/ work, I've been using the AWACS driver for weeks now, and I
don't have any stability or audio issues (that I notice), and my Mini is on
24/7.

People that want sound support on their Minis right away can use this patch
while waiting for the rework of the drivers, without fear of their computer
exploding or so.

Cheers,

PER

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