Commit 26f41062 authored by Kay, Allen M's avatar Kay, Allen M Committed by Jesse Barnes
Browse files

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: default avatarJean Guyader <jean.guyader@eu.citrix.com>
Signed-off-by: default avatarEric Chanudet <eric.chanudet@citrix.com>
Signed-off-by: default avatarAllen Kay <allen.m.kay@intel.com>
Signed-off-by: default avatarJesse Barnes <jbarnes@virtuousgeek.org>
parent 2debd928
......@@ -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);
......
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