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>

diff --git a/sound/pci/oxygen/oxygen_io.c b/sound/pci/oxygen/oxygen_io.c
index 521eae4..4b88c7a 100644 (file)
--- 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;