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[PATCH] PCI: reverse pci config space restore order 

According to Intel ICH spec, there are several rules that Base Address
should be programmed before IOSE  (PCICMD register ) enabled.

For example ICH7:

12.1.3  SATA : the base address register for the bus master register
               should be programmed before this bit is set.

11.1.3:  PCICMD (USB): The base address register for USB should be
                       programmed before this bit is set.
....

To make sure kernel code follow this rule , and prevent unnecessary
confusion. I proposal this patch.

Signed-off-by: Luming Yu <luming.yu@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
hifive-unleashed-5.1
Yu, Luming 2006-04-25 00:00:34 -07:00 committed by Greg Kroah-Hartman
parent 04d9c1a110
commit 8b8c8d280a
1 changed files with 5 additions and 1 deletions
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6
drivers/pci/pci.c
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@ -463,7 +463,11 @@ pci_restore_state(struct pci_dev *dev)
int i;
int val;
for (i = 0; i < 16; i++) {
/*
* The Base Address register should be programmed before the command
* register(s)
*/
for (i = 15; i >= 0; i--) {
pci_read_config_dword(dev, i * 4, &val);
if (val != dev->saved_config_space[i]) {
printk(KERN_DEBUG "PM: Writing back config space on "