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authorJohn W. Linville <linville@tuxdriver.com>2005-09-14 09:52:42 -0400
committerLinus Torvalds <torvalds@g5.osdl.org>2005-09-14 09:37:17 -0700
commit32a3658533c6f4c6bf370dd730213e802464ef9b (patch)
treee473c32ffcfc0529c3467c9990e592a362c51d8b
parent186051d70444742bf1c2bc0257dd4696a3df66e3 (diff)
[PATCH] pci: only call pci_restore_bars at boot
Certain (SGI?) ia64 boxes object to having their PCI BARs restored unless absolutely necessary. This patch restricts calling pci_restore_bars from pci_set_power_state unless the current state is PCI_UNKNOWN, the actual (i.e. physical) state of the device is PCI_D3hot, and the device indicates that it will lose its configuration when transitioning to PCI_D0. Signed-off-by: John W. Linville <linville@tuxdriver.com> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--drivers/pci/pci.c16
1 files changed, 12 insertions, 4 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 992db89adce..259d247b755 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -309,17 +309,25 @@ pci_set_power_state(struct pci_dev *dev, pci_power_t state)
pci_read_config_word(dev, pm + PCI_PM_CTRL, &pmcsr);
- /* If we're in D3, force entire word to 0.
+ /* If we're (effectively) in D3, force entire word to 0.
* This doesn't affect PME_Status, disables PME_En, and
* sets PowerState to 0.
*/
- if (dev->current_state >= PCI_D3hot) {
- if (!(pmcsr & PCI_PM_CTRL_NO_SOFT_RESET))
+ switch (dev->current_state) {
+ case PCI_UNKNOWN: /* Boot-up */
+ if ((pmcsr & PCI_PM_CTRL_STATE_MASK) == PCI_D3hot
+ && !(pmcsr & PCI_PM_CTRL_NO_SOFT_RESET))
need_restore = 1;
+ /* Fall-through: force to D0 */
+ case PCI_D3hot:
+ case PCI_D3cold:
+ case PCI_POWER_ERROR:
pmcsr = 0;
- } else {
+ break;
+ default:
pmcsr &= ~PCI_PM_CTRL_STATE_MASK;
pmcsr |= state;
+ break;
}
/* enter specified state */