Update of /cvsroot/alsa/alsa-kernel/pci/ac97
In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv19577/ac97
Modified Files:
ac97_codec.c
Log Message:
- export snd_ac97_suspend().
- mute MASTER and HEADPHONE volumes in suspend to avoid possible clicks.
Index: ac97_codec.c
===================================================================
RCS file: /cvsroot/alsa/alsa-kernel/pci/ac97/ac97_codec.c,v
retrieving revision 1.128
retrieving revision 1.129
diff -u -r1.128 -r1.129
--- ac97_codec.c 7 Apr 2004 17:48:18 -0000 1.128
+++ ac97_codec.c 14 Apr 2004 17:25:51 -0000 1.129
@@ -2001,11 +2001,19 @@
* @ac97: the ac97 instance
*
* Suspends the codec, power down the chip.
+ * MASTER and HEADPHONE registers are muted but the register cache values
+ * are not changed, so that the values can be restored in snd_ac97_resume().
*/
void snd_ac97_suspend(ac97_t *ac97)
{
unsigned short power = (ac97->regs[AC97_POWERDOWN] ^ 0x8000) & ~0x8000; /*
invert EAPD */
+ if (ac97_is_audio(ac97)) {
+ /* some codecs have stereo mute bits */
+ snd_ac97_write(ac97, AC97_MASTER, 0x9f9f);
+ snd_ac97_write(ac97, AC97_HEADPHONE, 0x9f9f);
+ }
+
power |= 0x4000; /* Headphone amplifier powerdown */
power |= 0x0300; /* ADC & DAC powerdown */
snd_ac97_write(ac97, AC97_POWERDOWN, power);
@@ -2297,6 +2305,7 @@
EXPORT_SYMBOL(snd_ac97_set_rate);
#ifdef CONFIG_PM
EXPORT_SYMBOL(snd_ac97_resume);
+EXPORT_SYMBOL(snd_ac97_suspend);
#endif
/*
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