[ALSA] intel8x0 - wait for ICH_RESETREGS
Modules: Intel8x0 driver
It seems that hardware requires some time to reset bus master registers.
We need to wait until ICH_RESETREGS bit is not released.
The suggestion and symptom was described by Mike Gorchak <lestat@i.com.ua>.
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
diff --git a/sound/pci/intel8x0.c b/sound/pci/intel8x0.c
index da024ff..ebbf2cf 100644
--- a/sound/pci/intel8x0.c
+++ b/sound/pci/intel8x0.c
@@ -2351,7 +2351,7 @@
static int snd_intel8x0_chip_init(struct intel8x0 *chip, int probing)
{
- unsigned int i;
+ unsigned int i, timeout;
int err;
if (chip->device_type != DEVICE_ALI) {
@@ -2369,6 +2369,15 @@
/* reset channels */
for (i = 0; i < chip->bdbars_count; i++)
iputbyte(chip, ICH_REG_OFF_CR + chip->ichd[i].reg_offset, ICH_RESETREGS);
+ for (i = 0; i < chip->bdbars_count; i++) {
+ timeout = 100000;
+ while (--timeout != 0) {
+ if ((igetbyte(chip, ICH_REG_OFF_CR + chip->ichd[i].reg_offset) & ICH_RESETREGS) == 0)
+ break;
+ }
+ if (timeout == 0)
+ printk(KERN_ERR "intel8x0: reset of registers failed?\n");
+ }
/* initialize Buffer Descriptor Lists */
for (i = 0; i < chip->bdbars_count; i++)
iputdword(chip, ICH_REG_OFF_BDBAR + chip->ichd[i].reg_offset,