mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-05 02:19:51 +00:00
[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. The most simple fix is to clear the PEC bit after after every transaction. That's what this driver was doing up to 2.6.15 (inclusive). Thanks to Daniele Gaffuri for the very good report. Signed-off-by: Jean Delvare <khali@linux-fr.org> Cc: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
parent
7daa0c4f51
commit
c79cfbacca
1 changed files with 5 additions and 0 deletions
|
@ -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)
|
||||
|
|
Loading…
Reference in a new issue