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ALSA: oxygen: add the separate SPI waiting function 

The oxygen_wait_spi() function now performs waiting when the
SPI bus completes a transaction. Introduce the timeout error
checking and increase timeout to 200 from 40.

Signed-off-by: Roman Volkov <v1ron@mail.ru>
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
This commit is contained in:
Roman Volkov 2014-01-24 16:18:02 +04:00 committed by Clemens Ladisch
parent d8ec26d7f8
commit 10dd44dc88
1 changed files with 18 additions and 0 deletions
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18
sound/pci/oxygen/oxygen_io.c
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@ -194,6 +194,24 @@ void oxygen_write_ac97_masked(struct oxygen *chip, unsigned int codec,
}
EXPORT_SYMBOL(oxygen_write_ac97_masked);
static int oxygen_wait_spi(struct oxygen *chip)
{
unsigned int count;
/*
* Higher timeout to be sure: 200 us;
* actual transaction should not need more than 40 us.
*/
for (count = 50; count > 0; count--) {
udelay(4);
if ((oxygen_read8(chip, OXYGEN_SPI_CONTROL) &
OXYGEN_SPI_BUSY) == 0)
return 0;
}
snd_printk(KERN_ERR "oxygen: SPI wait timeout\n");
return -EIO;
}
void oxygen_write_spi(struct oxygen *chip, u8 control, unsigned int data)
{
unsigned int count;