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| author | Roman Volkov <v1ron@mail.ru> | 2014-01-24 16:18:02 +0400 |
|---|---|---|
| committer | Clemens Ladisch <clemens@ladisch.de> | 2014-01-29 20:45:43 +0100 |
| commit | 10dd44dc88419ba5278435669ac9e35f9f410c7e (patch) | |
| tree | 9f9de11ed1b86e7bdd266aaa291fe1324b5e4aed /sound | |
| parent | d8ec26d7f8287f5788a494f56e8814210f0e64be (diff) | |
| download | linux-stable-10dd44dc88419ba5278435669ac9e35f9f410c7e.tar.gz linux-stable-10dd44dc88419ba5278435669ac9e35f9f410c7e.tar.bz2 linux-stable-10dd44dc88419ba5278435669ac9e35f9f410c7e.zip | |
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>
Diffstat (limited to 'sound')
| -rw-r--r-- | sound/pci/oxygen/oxygen_io.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/sound/pci/oxygen/oxygen_io.c b/sound/pci/oxygen/oxygen_io.c index 521eae458348..4b88c7a332e4 100644 --- a/sound/pci/oxygen/oxygen_io.c +++ b/sound/pci/oxygen/oxygen_io.c @@ -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; |