[ALSA] Fix resume of intel8x0

Intel8x0 driver,AC97 Codec
Fix resume of intel8x0 driver.  The ac97 codec didn't restore some registers
properly, and the restore of ICH4 SPDIF and SDIN settings was missing.
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/ac97/ac97_codec.c

@@ -367,6 +367,7 @@ int snd_ac97_update(ac97_t *ac97, unsigned short reg, unsigned short value)
 		ac97->regs[reg] = value;
 		ac97->bus->ops->write(ac97, reg, value);
 	}
+	set_bit(reg, ac97->reg_accessed);
 	up(&ac97->reg_mutex);
 	return change;
 }
@@ -410,6 +411,7 @@ int snd_ac97_update_bits_nolock(ac97_t *ac97, unsigned short reg,
 		ac97->regs[reg] = new;
 		ac97->bus->ops->write(ac97, reg, new);
 	}
+	set_bit(reg, ac97->reg_accessed);
 	return change;
 }
 

sound/pci/intel8x0.c

@@ -424,6 +424,7 @@ struct _snd_intel8x0 {
 	unsigned xbox: 1;		/* workaround for Xbox AC'97 detection */
 
 	int spdif_idx;	/* SPDIF BAR index; *_SPBAR or -1 if use PCMOUT */
+	unsigned int sdm_saved;	/* SDM reg value */
 
 	ac97_bus_t *ac97_bus;
 	ac97_t *ac97[3];
@@ -2373,6 +2374,8 @@ static int intel8x0_suspend(snd_card_t *card, pm_message_t state)
 	for (i = 0; i < 3; i++)
 		if (chip->ac97[i])
 			snd_ac97_suspend(chip->ac97[i]);
+	if (chip->device_type == DEVICE_INTEL_ICH4)
+		chip->sdm_saved = igetbyte(chip, ICHREG(SDM));
 	pci_disable_device(chip->pci);
 	return 0;
 }
@@ -2386,6 +2389,16 @@ static int intel8x0_resume(snd_card_t *card)
 	pci_set_master(chip->pci);
 	snd_intel8x0_chip_init(chip, 0);
 
+	/* re-initialize mixer stuff */
+	if (chip->device_type == DEVICE_INTEL_ICH4) {
+		/* enable separate SDINs for ICH4 */
+		iputbyte(chip, ICHREG(SDM), chip->sdm_saved);
+		/* use slot 10/11 for SPDIF */
+		iputdword(chip, ICHREG(GLOB_CNT),
+			  (igetdword(chip, ICHREG(GLOB_CNT)) & ~ICH_PCM_SPDIF_MASK) |
+			  ICH_PCM_SPDIF_1011);
+	}
+
 	/* refill nocache */
 	if (chip->fix_nocache)
 		fill_nocache(chip->bdbars.area, chip->bdbars.bytes, 1);