diff options
| author | Jean Delvare <khali@linux-fr.org> | 2006-04-18 14:15:59 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2006-04-24 09:56:04 -0700 |
| commit | 8b5218c3859d26c13649272074b81d4b2beb7b49 (patch) | |
| tree | fc2398a651e1b5fa4a9300908f257a10abb0c5cc | |
| parent | 9bab38e4ffd67ba44073f8074318e32309f4debd (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>
| -rw-r--r-- | drivers/i2c/busses/i2c-i801.c | 5 |
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) |