[PATCH v3 2/2] pci/aer: interrupt fixup in the quirk
From: Po Liu <hidden>
Date: 2016-06-14 08:49:54
Also in:
linux-arm-kernel, linux-pci, lkml
Subsystem:
pci subsystem, the rest · Maintainers:
Bjorn Helgaas, Linus Torvalds
On some platforms, root port doesn't support MSI/MSI-X/INTx in RC mode. When chip support the aer interrupt with none MSI/MSI-X/INTx mode, maybe there is interrupt line for aer pme etc. Search the interrupt number in the fdt file. Then fixup the dev->irq with it. Signed-off-by: Po Liu <redacted> --- changes for V3: - Move to quirk; - Only correct the irq in RC mode; drivers/pci/quirks.c | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+)
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index ee72ebe..8b39cce 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c@@ -25,6 +25,7 @@ #include <linux/sched.h> #include <linux/ktime.h> #include <linux/mm.h> +#include <linux/of_irq.h> #include <asm/dma.h> /* isa_dma_bridge_buggy */ #include "pci.h"
@@ -4419,3 +4420,31 @@ static void quirk_intel_qat_vf_cap(struct pci_dev *pdev) } } DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0x443, quirk_intel_qat_vf_cap); + +/* If root port doesn't support MSI/MSI-X/INTx in RC mode, + * but use standalone irq. Read the device tree for the aer + * interrupt number. + */ +static void quirk_aer_interrupt(struct pci_dev *dev) +{ + int ret; + u8 header_type; + struct device_node *np = NULL; + + /* Only for the RC mode device */ + pci_read_config_byte(dev, PCI_HEADER_TYPE, &header_type); + if ((header_type & 0x7F) != PCI_HEADER_TYPE_BRIDGE) + return; + + if (dev->bus->dev.of_node) + np = dev->bus->dev.of_node; + + if (IS_ENABLED(CONFIG_OF_IRQ) && np) { + ret = of_irq_get_byname(np, "aer"); + if (ret > 0) { + dev->no_msi = 1; + dev->irq = ret; + } + } +} +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_FREESCALE, PCI_ANY_ID, quirk_aer_interrupt);
--
2.1.0.27.g96db324