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authorJean Delvare <khali@linux-fr.org>2006-04-18 14:15:59 +0200
committerGreg Kroah-Hartman <gregkh@suse.de>2006-04-24 09:56:04 -0700
commit8b5218c3859d26c13649272074b81d4b2beb7b49 (patch)
treefc2398a651e1b5fa4a9300908f257a10abb0c5cc /drivers
parent9bab38e4ffd67ba44073f8074318e32309f4debd (diff)
[PATCH] i2c-i801: Fix resume when PEC is used
Fix for bug #6395: Fail to resume on Tecra M2 with ADM1032 and Intel 82801DBM The BIOS of the Tecra M2 doesn't like it when it has to reboot or resume after the i2c-i801 driver has left the SMBus in PEC mode. I have a more complete fix for 2.6.17 but the simple approach of leaving the SMBus in non-PEC mode after every transaction should do for -stable. That's what the i2c-i801 driver was doing up to 2.6.15 (inclusive). Signed-off-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/i2c/busses/i2c-i801.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/i2c/busses/i2c-i801.c b/drivers/i2c/busses/i2c-i801.c
index 8e0f3158215f..dfca74933625 100644
--- a/drivers/i2c/busses/i2c-i801.c
+++ b/drivers/i2c/busses/i2c-i801.c
@@ -478,6 +478,11 @@ static s32 i801_access(struct i2c_adapter * adap, u16 addr,
ret = i801_transaction();
}
+ /* Some BIOSes don't like it when PEC is enabled at reboot or resume
+ time, so we forcibly disable it after every transaction. */
+ if (hwpec)
+ outb_p(0, SMBAUXCTL);
+
if(block)
return ret;
if(ret)