aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorClemens Ladisch <clemens@ladisch.de>2009-09-07 10:18:54 +0200
committerGreg Kroah-Hartman <gregkh@suse.de>2009-09-24 08:27:17 -0700
commit852a95da5412bb513bf83ad1daa39992fa72b81e (patch)
tree956a0a2a44f26aa4c1d5cd6a63b88390d2a8e5db
parent23b7ff36511e0aea0b054d0c7236f8f91509da07 (diff)
downloadlinux-linaro-stable-852a95da5412bb513bf83ad1daa39992fa72b81e.tar.gz
sound: oxygen: work around MCE when changing volume
commit f1bc07af9a9edc5c1d4bdd971f7099316ed2e405 upstream. When the volume is changed continuously (e.g., when the user drags a volume slider with the mouse), the driver does lots of I2C writes. Apparently, the sound chip can get confused when we poll the I2C status register too much, and fails to complete a read from it. On the PCI-E models, the PCI-E/PCI bridge gets upset by this and generates a machine check exception. To avoid this, this patch replaces the polling with an unconditional wait that is guaranteed to be long enough. Signed-off-by: Clemens Ladisch <clemens@ladisch.de> Tested-by: Johann Messner <johann.messner at jku.at> Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--sound/pci/oxygen/oxygen_io.c11
1 files changed, 1 insertions, 10 deletions
diff --git a/sound/pci/oxygen/oxygen_io.c b/sound/pci/oxygen/oxygen_io.c
index c1eb923f2ac9..09b2b2a36df5 100644
--- a/sound/pci/oxygen/oxygen_io.c
+++ b/sound/pci/oxygen/oxygen_io.c
@@ -215,17 +215,8 @@ EXPORT_SYMBOL(oxygen_write_spi);
void oxygen_write_i2c(struct oxygen *chip, u8 device, u8 map, u8 data)
{
- unsigned long timeout;
-
/* should not need more than about 300 us */
- timeout = jiffies + msecs_to_jiffies(1);
- do {
- if (!(oxygen_read16(chip, OXYGEN_2WIRE_BUS_STATUS)
- & OXYGEN_2WIRE_BUSY))
- break;
- udelay(1);
- cond_resched();
- } while (time_after_eq(timeout, jiffies));
+ msleep(1);
oxygen_write8(chip, OXYGEN_2WIRE_MAP, map);
oxygen_write8(chip, OXYGEN_2WIRE_DATA, data);