[PATCH v2 2/2] pci/aer: interrupt fixup in the quirk

Po Liu
2016-06-14T06:23:23Z

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@nxp.com>
---
changes for V2:
- Move to the quirk file

drivers/pci/quirks.c | 23 +++++++++++++++++++++++
1 file changed, 23 insertions(+)

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index ee72ebe..909d479 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 +4420,25 @@ 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;
+ struct device_node *np = NULL;
+
+ 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