Browse Source

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>
isee-imx_3.14.28.y
Roman Volkov 7 years ago
committed by Clemens Ladisch
parent
commit
10dd44dc88
1 changed files with 18 additions and 0 deletions
  1. +18
    -0
      sound/pci/oxygen/oxygen_io.c

+ 18
- 0
sound/pci/oxygen/oxygen_io.c View File

@ -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;


Loading…
Cancel
Save