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PCI: check for pci bar restore completion and retry 

On some OEM systems, pci_restore_state() is called while FLR has not yet
completed.  As a result, PCI BAR register restore is not successful.  This fix
reads back the restored value and compares it with saved value and re-tries 10
times before giving up.

Signed-off-by: Jean Guyader <jean.guyader@eu.citrix.com>
Signed-off-by: Eric Chanudet <eric.chanudet@citrix.com>
Signed-off-by: Allen Kay <allen.m.kay@intel.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Kay, Allen M 2012-01-26 10:25:53 -08:00 committed by Jesse Barnes
parent 2debd92899
commit 26f41062f2
1 changed files with 6 additions and 1 deletions
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7
drivers/pci/pci.c
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@ -959,6 +959,7 @@ void pci_restore_state(struct pci_dev *dev)
{
int i;
u32 val;
int tries;
if (!dev->state_saved)
return;
@ -973,12 +974,16 @@ void pci_restore_state(struct pci_dev *dev)
*/
for (i = 15; i >= 0; i--) {
pci_read_config_dword(dev, i * 4, &val);
if (val != dev->saved_config_space[i]) {
tries = 10;
while (tries && val != dev->saved_config_space[i]) {
dev_dbg(&dev->dev, "restoring config "
"space at offset %#x (was %#x, writing %#x)\n",
i, val, (int)dev->saved_config_space[i]);
pci_write_config_dword(dev,i * 4,
dev->saved_config_space[i]);
pci_read_config_dword(dev, i * 4, &val);
mdelay(10);
tries--;
}
}
pci_restore_pcix_state(dev);