static void snd_intel8x0_codec_write(struct snd_ac97 *ac97,
unsigned short reg,
unsigned short val)
{
struct intel8x0 *chip = ac97->private_data;
+ dev_info(chip->card->dev, "ac97 write %d - %.2x : %.4x\n", ac97->num, reg,
val);
if (snd_intel8x0_codec_semaphore(chip, ac97->num) < 0) {
if (! chip->in_ac97_init)
dev_err(chip->card->dev,
"codec_write %d: semaphore is not ready for
register 0x%x\n",
ac97->num, reg);
}
iaputword(chip, reg + ac97->num * 0x80, val);
}
static unsigned short snd_intel8x0_codec_read(struct snd_ac97 *ac97,
unsigned short reg)
{
struct intel8x0 *chip = ac97->private_data;
unsigned short res;
unsigned int tmp;
if (snd_intel8x0_codec_semaphore(chip, ac97->num) < 0) {
if (! chip->in_ac97_init)
dev_err(chip->card->dev,
"codec_read %d: semaphore is not ready for
register 0x%x\n",
ac97->num, reg);
res = 0xffff;
} else {
res = iagetword(chip, reg + ac97->num * 0x80);
if ((tmp = igetdword(chip, ICHREG(GLOB_STA))) & ICH_RCS) {
/* reset RCS and preserve other R/WC bits */
iputdword(chip, ICHREG(GLOB_STA), tmp &
~(chip->codec_ready_bits | ICH_GSCI));
if (! chip->in_ac97_init)
dev_err(chip->card->dev,
"codec_read %d: read timeout for
register 0x%x\n",
ac97->num, reg);
res = 0xffff;
}
}
+ dev_info(chip->card->dev, "ac97 read %d - %.2x : %.4x\n", ac97->num, reg,
res);
return res;
}
if you cannot enable LogFlowFunc of virtualbox
you need to add code to dump the value of ac97 read/write in intel8x0.c
and post the system log (dmesg)
https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/tree/sound/pci/intel8x0.c
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https://bugs.launchpad.net/bugs/1487168
Title:
[Emulated AD1980 AC97 inside Virualbox 5.0, playback] volume slider
problem
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https://bugs.launchpad.net/virtualbox/+bug/1487168/+subscriptions
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