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authorClemens Ladisch <clemens@ladisch.de>2009-09-07 10:18:54 +0200
committerTakashi Iwai <tiwai@suse.de>2009-09-07 12:15:43 +0200
commitf1bc07af9a9edc5c1d4bdd971f7099316ed2e405 (patch)
tree687bafab754de6ff5a1857b81fdfe33b77219fb0 /sound/pci/oxygen
parent92653453c3015c083b9fe0ad48261c6b2267d482 (diff)
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sound: oxygen: work around MCE when changing volume
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> Cc: <stable@kernel.org> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/pci/oxygen')
-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 c1eb923f2ac..09b2b2a36df 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);