In message <[EMAIL PROTECTED]>, Takashi Iwai writes:
>we have already a method to change the spdif rate:
> snd_ac97_set_rate(ac97, AC97_SPDIF, rate);
>but it didn't work properly. so i fixed the relevant part based on
>your patch.
>to via82xx.c, the above call was just added, so that the spdif rate is
>automatically changed.
I have produced a minimal patch based upon your work in CVS to get the SPDIF
port going on A7V8X motherboards with 0.9.0rc6 until 0.9.0rc7 is released:
--- alsa-driver-0.9.0rc6/alsa-kernel/pci/via82xx.c.orig 2002-12-27 17:25:29.000000000
-0500
+++ alsa-driver-0.9.0rc6/alsa-kernel/pci/via82xx.c 2002-12-27 17:27:22.000000000
+-0500
@@ -613,6 +613,9 @@
snd_pcm_runtime_t *runtime = substream->runtime;
snd_ac97_set_rate(chip->ac97, AC97_PCM_FRONT_DAC_RATE, runtime->rate);
+ snd_ac97_set_rate(chip->ac97, AC97_PCM_SURR_DAC_RATE, runtime->rate);
+ snd_ac97_set_rate(chip->ac97, AC97_PCM_LFE_DAC_RATE, runtime->rate);
+ snd_ac97_set_rate(chip->ac97, AC97_SPDIF, runtime->rate);
if (chip->chip_type == TYPE_VIA8233 &&
chip->playback.reg_offset != VIA_REG_MULTPLAY_STATUS) {
unsigned int tmp;
--- alsa-driver-0.9.0rc6/alsa-kernel/pci/ac97/ac97_codec.c.orig 2002-12-27
17:29:08.000000000 -0500
+++ alsa-driver-0.9.0rc6/alsa-kernel/pci/ac97/ac97_codec.c 2002-12-27
+17:43:43.000000000 -0500
@@ -1942,6 +1942,45 @@
}
}
+static int set_spdif_rate(ac97_t *ac97, unsigned short rate)
+{
+ unsigned short old, bits, reg;
+
+ if (! (ac97->ext_id & AC97_EI_SPDIF))
+ return -ENODEV;
+
+ if (ac97->flags & AC97_CS_SPDIF) {
+ switch (rate) {
+ case 48000: bits = 0; break;
+ case 44100: bits = 1 << AC97_SC_SPSR_SHIFT; break;
+ default: /* invalid - disable output */
+ snd_ac97_update_bits(ac97, AC97_EXTENDED_STATUS,
+AC97_EA_SPDIF, 0);
+ return -EINVAL;
+ }
+ reg = AC97_CSR_SPDIF;
+ } else {
+ switch (rate) {
+ case 44100: bits = AC97_SC_SPSR_44K; break;
+ case 48000: bits = AC97_SC_SPSR_48K; break;
+ case 32000: bits = AC97_SC_SPSR_32K; break;
+ default: /* invalid - disable output */
+ snd_ac97_update_bits(ac97, AC97_EXTENDED_STATUS,
+AC97_EA_SPDIF, 0);
+ return -EINVAL;
+ }
+ reg = AC97_SPDIF;
+ }
+
+ spin_lock(&ac97->reg_lock);
+ old = ac97->regs[reg] & ~AC97_SC_SPSR_MASK;
+ if (old != bits) {
+ snd_ac97_update_bits_nolock(ac97, AC97_EXTENDED_STATUS, AC97_EA_SPDIF,
+0);
+ snd_ac97_update_bits_nolock(ac97, reg, AC97_SC_SPSR_MASK, bits);
+ }
+ snd_ac97_update_bits_nolock(ac97, AC97_EXTENDED_STATUS, AC97_EA_SPDIF,
+AC97_EA_SPDIF);
+ spin_unlock(&ac97->reg_lock);
+ return 0;
+}
+
/*
* PCM support
*/
@@ -1971,8 +2010,9 @@
return -EINVAL;
break;
case AC97_SPDIF:
- return 0;
- default: return -EINVAL;
+ return set_spdif_rate(ac97, rate);
+ default:
+ return -EINVAL;
}
tmp = ((unsigned int)rate * ac97->clock) / 48000;
if (tmp > 65535)
--
John GOTTS <[EMAIL PROTECTED]> http://linuxsavvy.com/staff/jgotts
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