* [PATCH] i2c-i801: Retry on lost arbitration
@ 2009-11-01 12:25 Jean Delvare
0 siblings, 0 replies; only message in thread
From: Jean Delvare @ 2009-11-01 12:25 UTC (permalink / raw)
To: Linux I2C
The Intel 82801 is sometimes used on systems with a BMC connected. The
BMC can access the SMBus, resulting in lost arbitration for the 82801.
We should let i2c-core retry transactions for us in this case.
Signed-off-by: Jean Delvare <khali-PUYAD+kWke1g9hUCZPvPmw@public.gmane.org>
---
drivers/i2c/busses/i2c-i801.c | 3 +++
1 file changed, 3 insertions(+)
--- linux-2.6.32-rc5.orig/drivers/i2c/busses/i2c-i801.c 2009-10-05 10:45:49.000000000 +0200
+++ linux-2.6.32-rc5/drivers/i2c/busses/i2c-i801.c 2009-11-01 11:33:29.000000000 +0100
@@ -767,6 +767,9 @@ static int __devinit i801_probe(struct p
/* set up the sysfs linkage to our parent device */
i801_adapter.dev.parent = &dev->dev;
+ /* Retry up to 3 times on arbitration loss */
+ i801_adapter.retries = 3;
+
snprintf(i801_adapter.name, sizeof(i801_adapter.name),
"SMBus I801 adapter at %04lx", i801_smba);
err = i2c_add_adapter(&i801_adapter);
--
Jean Delvare
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