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[ALSA] oxygen: use AC97 interrupt

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After an AC97 register read or write, use the AC97 interrupt instead of
polling to wait for the access to be completed.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Clemens Ladisch
2008-01-28 08:34:21 +01:00
committed by Jaroslav Kysela
parent 911b499af4
commit 1e821dd276
3 changed files with 28 additions and 11 deletions
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24
sound/pci/oxygen/oxygen_io.c
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@@ -85,14 +85,22 @@ EXPORT_SYMBOL(oxygen_write32_masked);
static int oxygen_ac97_wait(struct oxygen *chip, unsigned int mask)
{
unsigned long timeout = jiffies + msecs_to_jiffies(1);
do {
udelay(5);
cond_resched();
if (oxygen_read8(chip, OXYGEN_AC97_INTERRUPT_STATUS) & mask)
return 0;
} while (time_after_eq(timeout, jiffies));
return -EIO;
u8 status = 0;
/*
* Reading the status register also clears the bits, so we have to save
* the read bits in status.
*/
wait_event_timeout(chip->ac97_waitqueue,
({ status |= oxygen_read8(chip, OXYGEN_AC97_INTERRUPT_STATUS);
status & mask; }),
msecs_to_jiffies(1) + 1);
/*
* Check even after a timeout because this function should not require
* the AC'97 interrupt to be enabled.
*/
status |= oxygen_read8(chip, OXYGEN_AC97_INTERRUPT_STATUS);
return status & mask ? 0 : -EIO;
}
/*