diff options
| author | Shengzhou Liu <Shengzhou.Liu@freescale.com> | 2012-07-18 08:06:54 +0200 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2012-09-07 23:40:31 +0200 |
| commit | e237d83fdf0313d26af46f41b69b3b87d62669c0 (patch) | |
| tree | e7ba6db54a2d3f65d5330722dc1f30c343acd3c8 /drivers/pci | |
| parent | Linux 3.6-rc1 (diff) | |
| download | linux-e237d83fdf0313d26af46f41b69b3b87d62669c0.tar.xz linux-e237d83fdf0313d26af46f41b69b3b87d62669c0.zip | |
PCI: Use dev->irq instead of dev->pin to enable non MSI/INTx interrupt
On some platforms, root port has neither MSI/MSI-X nor INTx interrupt
generated in RC mode. In this case, we have to use other interrupt, e.g.,
system shared interrupt, for port service IRQ to have AER, Hot-plug, etc.,
services work.
Signed-off-by: Shengzhou Liu <Shengzhou.Liu@freescale.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/pcie/portdrv_core.c | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/drivers/pci/pcie/portdrv_core.c b/drivers/pci/pcie/portdrv_core.c index 75915b30ad19..eaa39fb448c4 100644 --- a/drivers/pci/pcie/portdrv_core.c +++ b/drivers/pci/pcie/portdrv_core.c @@ -200,10 +200,13 @@ static int init_service_irqs(struct pci_dev *dev, int *irqs, int mask) { int i, irq = -1; - /* We have to use INTx if MSI cannot be used for PCIe PME or pciehp. */ + /* + * If MSI cannot be used for PCIe PME or hotplug, we have to use + * INTx or other interrupts, e.g. system shared interrupt. + */ if (((mask & PCIE_PORT_SERVICE_PME) && pcie_pme_no_msi()) || ((mask & PCIE_PORT_SERVICE_HP) && pciehp_no_msi())) { - if (dev->pin) + if (dev->irq) irq = dev->irq; goto no_msi; } @@ -212,8 +215,12 @@ static int init_service_irqs(struct pci_dev *dev, int *irqs, int mask) if (!pcie_port_enable_msix(dev, irqs, mask)) return 0; - /* We're not going to use MSI-X, so try MSI and fall back to INTx */ - if (!pci_enable_msi(dev) || dev->pin) + /* + * We're not going to use MSI-X, so try MSI and fall back to INTx. + * If neither MSI/MSI-X nor INTx available, try other interrupt. On + * some platforms, root port doesn't support MSI/MSI-X/INTx in RC mode. + */ + if (!pci_enable_msi(dev) || dev->irq) irq = dev->irq; no_msi: |