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authorRoman Volkov <v1ron@mail.ru>2014-01-24 16:18:02 +0400
committerClemens Ladisch <clemens@ladisch.de>2014-01-29 20:45:43 +0100
commit10dd44dc88419ba5278435669ac9e35f9f410c7e (patch)
tree9f9de11ed1b86e7bdd266aaa291fe1324b5e4aed /sound/pci/oxygen/oxygen_io.c
parentd8ec26d7f8287f5788a494f56e8814210f0e64be (diff)
downloadblackbird-op-linux-10dd44dc88419ba5278435669ac9e35f9f410c7e.tar.gz
blackbird-op-linux-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/pci/oxygen/oxygen_io.c')
-rw-r--r--sound/pci/oxygen/oxygen_io.c18
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;
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