Merge branch 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...

[mirror_ubuntu-artful-kernel.git] / arch / x86 / pci / intel_mid_pci.c

diff --git a/arch/x86/pci/intel_mid_pci.c b/arch/x86/pci/intel_mid_pci.c
index 22aaefb4f1cadf5bc136b4a72af08939fc4aae30..0d24e7c101454057f432dd976ea7e3d537e0a38c 100644 (file)
--- a/arch/x86/pci/intel_mid_pci.c
+++ b/arch/x86/pci/intel_mid_pci.c
@@ -35,6 +35,9 @@
 
 #define PCIE_CAP_OFFSET        0x100
 
+/* Quirks for the listed devices */
+#define PCI_DEVICE_ID_INTEL_MRFL_MMC   0x1190
+
 /* Fixed BAR fields */
 #define PCIE_VNDR_CAP_ID_FIXED_BAR 0x00        /* Fixed BAR (TBD) */
 #define PCI_FIXED_BAR_0_SIZE   0x04
@@ -210,22 +213,41 @@ static int intel_mid_pci_irq_enable(struct pci_dev *dev)
 {
        struct irq_alloc_info info;
        int polarity;
+       int ret;
 
        if (pci_has_managed_irq(dev))
                return 0;
 
-       if (intel_mid_identify_cpu() == INTEL_MID_CPU_CHIP_TANGIER)
-               polarity = 0; /* active high */
-       else
-               polarity = 1; /* active low */
+       switch (intel_mid_identify_cpu()) {
+       case INTEL_MID_CPU_CHIP_TANGIER:
+               polarity = IOAPIC_POL_HIGH;
+
+               /* Special treatment for IRQ0 */
+               if (dev->irq == 0) {
+                       /*
+                        * TNG has IRQ0 assigned to eMMC controller. But there
+                        * are also other devices with bogus PCI configuration
+                        * that have IRQ0 assigned. This check ensures that
+                        * eMMC gets it.
+                        */
+                       if (dev->device != PCI_DEVICE_ID_INTEL_MRFL_MMC)
+                               return -EBUSY;
+               }
+               break;
+       default:
+               polarity = IOAPIC_POL_LOW;
+               break;
+       }
+
        ioapic_set_alloc_attr(&info, dev_to_node(&dev->dev), 1, polarity);
 
        /*
         * MRST only have IOAPIC, the PCI irq lines are 1:1 mapped to
         * IOAPIC RTE entries, so we just enable RTE for the device.
         */
-       if (mp_map_gsi_to_irq(dev->irq, IOAPIC_MAP_ALLOC, &info) < 0)
-               return -EBUSY;
+       ret = mp_map_gsi_to_irq(dev->irq, IOAPIC_MAP_ALLOC, &info);
+       if (ret < 0)
+               return ret;
 
        dev->irq_managed = 1;
 
@@ -244,7 +266,7 @@ static void intel_mid_pci_irq_disable(struct pci_dev *dev)
        }
 }
 
-struct pci_ops intel_mid_pci_ops = {
+static struct pci_ops intel_mid_pci_ops = {
        .read = pci_read,
        .write = pci_write,
 };