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| author | John W. Linville <linville@tuxdriver.com> | 2005-09-14 15:52:42 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-09-14 18:37:17 +0200 |
| commit | 32a3658533c6f4c6bf370dd730213e802464ef9b (patch) | |
| tree | e473c32ffcfc0529c3467c9990e592a362c51d8b /drivers/pci | |
| parent | Merge branch 'upstream-fixes' of master.kernel.org:/pub/scm/linux/kernel/git/... (diff) | |
| download | linux-32a3658533c6f4c6bf370dd730213e802464ef9b.tar.xz linux-32a3658533c6f4c6bf370dd730213e802464ef9b.zip | |
[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>
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/pci.c | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 992db89adce7..259d247b7551 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 */ |