[i2c] [PATCH 3/4] i2c-i801: Clear special mode bits as needed

[Jean Delvare]

Clear special mode bits (PEC, block buffer) at driver load time,
you never know in which state the device was left by its last user.

Also make sure that we reset the block buffer mode at the end of every
transaction, not only when PEC was used.

Signed-off-by: Jean Delvare <khali at linux-fr.org>
---
 drivers/i2c/busses/i2c-i801.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

--- linux-2.6.24-rc5.orig/drivers/i2c/busses/i2c-i801.c	2007-12-15 20:54:34.000000000 +0100
+++ linux-2.6.24-rc5/drivers/i2c/busses/i2c-i801.c	2007-12-15 21:01:55.000000000 +0100
@@ -502,7 +502,7 @@ static s32 i801_access(struct i2c_adapte
 	/* Some BIOSes don't like it when PEC is enabled at reboot or resume
 	   time, so we forcibly disable it after every transaction. Turn off
 	   E32B for the same reason. */
-	if (hwpec)
+	if (hwpec || block)
 		outb_p(inb_p(SMBAUXCTL) & ~(SMBAUXCTL_CRC | SMBAUXCTL_E32B),
 		       SMBAUXCTL);
 
@@ -625,6 +625,11 @@ static int __devinit i801_probe(struct p
 	else
 		dev_dbg(&dev->dev, "SMBus using PCI Interrupt\n");
 
+	/* Clear special mode bits */
+	if (i801_features & (FEATURE_SMBUS_PEC | FEATURE_BLOCK_BUFFER))
+		outb_p(inb_p(SMBAUXCTL) & ~(SMBAUXCTL_CRC | SMBAUXCTL_E32B),
+		       SMBAUXCTL);
+
 	/* set up the sysfs linkage to our parent device */
 	i801_adapter.dev.parent = &dev->dev;
 

-- 
Jean Delvare