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| author |   Yu, Luming <luming.yu@intel.com> | 2006-04-25 00:00:34 -0700 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@suse.de> | 2006-06-11 14:02:27 -0700 |
| commit | 8b8c8d280ab2d18fe6e42d671f60d4ffed451cdc (patch) | |
| tree | 83702395aa09b3a4497758e3cf0e5c52761c798a | |
| parent | [PATCH] PCI: Improve PCI config space writeback (diff) | |
| download | linux-dev-8b8c8d280ab2d18fe6e42d671f60d4ffed451cdc.tar.xz linux-dev-8b8c8d280ab2d18fe6e42d671f60d4ffed451cdc.zip | |
[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>
| -rw-r--r-- | drivers/pci/pci.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index d2520451f36b..12286275b1c8 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -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 " |