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Subject[PATCH] AC97 WM9713 power and audio changes
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Hi,

I've attached a patch against 2.4.25 that improves performance and power
levels in the WM9713.

Jeff, this depends on the previous AC97 patch I sent.

Changes:-

o Lower power consumption
o Better quality playback and record.
o Codec specific init() is now done after initialisation of the mixer
channel volumes. This prevents any init settings being clobbered by the
mixer volumes.


Liam
diff -urN a/drivers/sound/ac97_codec.c b/drivers/sound/ac97_codec.c
--- a/drivers/sound/ac97_codec.c 2004-03-04 10:24:26.000000000 +0000
+++ b/drivers/sound/ac97_codec.c 2004-03-04 10:29:17.000000000 +0000
@@ -932,11 +932,6 @@
codec->recmask_io = ac97_recmask_io;
codec->mixer_ioctl = ac97_mixer_ioctl;

- /* codec specific initialization for 4-6 channel output or secondary codec stuff */
- if (codec->codec_ops->init != NULL) {
- codec->codec_ops->init(codec);
- }
-
/* initialize mixer channel volumes */
for (i = 0; i < SOUND_MIXER_NRDEVICES; i++) {
struct mixer_defaults *md = &mixer_defaults[i];
@@ -947,6 +942,11 @@
ac97_set_mixer(codec, md->mixer, md->value);
}

+ /* codec specific initialization for 4-6 channel output or secondary codec stuff */
+ if (codec->codec_ops->init != NULL) {
+ codec->codec_ops->init(codec);
+ }
+
/*
* Volume is MUTE only on this device. We have to initialise
* it but its useless beyond that.
@@ -1104,10 +1104,12 @@
/* WM9713 */
static int wolfson_init13(struct ac97_codec * codec)
{
- codec->codec_write(codec, AC97_MASTER_VOL_STEREO, 0x0000);
- codec->codec_write(codec, AC97_HEADPHONE_VOL, 0x0000);
codec->codec_write(codec, AC97_RECORD_GAIN, 0x00a0);
- codec->codec_write(codec, AC97_EXTEND_MODEM_STAT, 0x0000);
+ codec->codec_write(codec, AC97_POWER_CONTROL, 0x0000);
+ codec->codec_write(codec, AC97_EXTENDED_MODEM_ID, 0xDA00);
+ codec->codec_write(codec, AC97_EXTEND_MODEM_STAT, 0x3810);
+ codec->codec_write(codec, AC97_PHONE_VOL, 0x0808);
+ codec->codec_write(codec, AC97_PCBEEP_VOL, 0x0808);
return 0;
}
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