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authorShengzhou Liu <Shengzhou.Liu@freescale.com>2012-07-18 10:06:54 +0400
committerBjorn Helgaas <bhelgaas@google.com>2012-09-08 01:40:31 +0400
commite237d83fdf0313d26af46f41b69b3b87d62669c0 (patch)
treee7ba6db54a2d3f65d5330722dc1f30c343acd3c8 /drivers/pci
parent0d7614f09c1ebdbaa1599a5aba7593f147bf96ee (diff)
downloadlinux-e237d83fdf0313d26af46f41b69b3b87d62669c0.tar.xz
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.c15
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: