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 <po.liu@xxxxxxx>
---
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
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