diff options
| author | Alex Williamson <alex.williamson@redhat.com> | 2013-08-09 00:09:24 +0400 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2013-08-10 02:47:48 +0400 |
| commit | 64e8674fbe6bc848333a9b7e19f8cc019dde9eab (patch) | |
| tree | 43321f9f0693954f38cf4b82fc0e1da3ea267d10 /drivers/pci | |
| parent | 3b2f64d00c46e1e4e9bd0bb9bb12619adac27a4b (diff) | |
| download | linux-64e8674fbe6bc848333a9b7e19f8cc019dde9eab.tar.xz | |
PCI: Add pci_reset_bridge_secondary_bus()
Move the secondary bus reset code from pci_parent_bus_reset() into its own
function. Export it as we'll later be calling it from hotplug controllers
and elsewhere.
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/pci.c | 32 |
1 files changed, 23 insertions, 9 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index e37fea6e178d..d46860898e1f 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -3215,9 +3215,30 @@ static int pci_pm_reset(struct pci_dev *dev, int probe) return 0; } -static int pci_parent_bus_reset(struct pci_dev *dev, int probe) +/** + * pci_reset_bridge_secondary_bus - Reset the secondary bus on a PCI bridge. + * @dev: Bridge device + * + * Use the bridge control register to assert reset on the secondary bus. + * Devices on the secondary bus are left in power-on state. + */ +void pci_reset_bridge_secondary_bus(struct pci_dev *dev) { u16 ctrl; + + pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &ctrl); + ctrl |= PCI_BRIDGE_CTL_BUS_RESET; + pci_write_config_word(dev, PCI_BRIDGE_CONTROL, ctrl); + msleep(100); + + ctrl &= ~PCI_BRIDGE_CTL_BUS_RESET; + pci_write_config_word(dev, PCI_BRIDGE_CONTROL, ctrl); + msleep(100); +} +EXPORT_SYMBOL_GPL(pci_reset_bridge_secondary_bus); + +static int pci_parent_bus_reset(struct pci_dev *dev, int probe) +{ struct pci_dev *pdev; if (pci_is_root_bus(dev->bus) || dev->subordinate || !dev->bus->self) @@ -3230,14 +3251,7 @@ static int pci_parent_bus_reset(struct pci_dev *dev, int probe) if (probe) return 0; - pci_read_config_word(dev->bus->self, PCI_BRIDGE_CONTROL, &ctrl); - ctrl |= PCI_BRIDGE_CTL_BUS_RESET; - pci_write_config_word(dev->bus->self, PCI_BRIDGE_CONTROL, ctrl); - msleep(100); - - ctrl &= ~PCI_BRIDGE_CTL_BUS_RESET; - pci_write_config_word(dev->bus->self, PCI_BRIDGE_CONTROL, ctrl); - msleep(100); + pci_reset_bridge_secondary_bus(dev->bus->self); return 0; } |