Commit e64e9db5 authored by Bjorn Helgaas's avatar Bjorn Helgaas Committed by Len Brown
Browse files

ACPI: PCI: always use the PCI INTx pin values, not the _PRT ones 



This patch changes pci_irq.c to always use PCI INTx pin encodings
instead of a mix of PCI and _PRT encodings.

The PCI INTx pin numbers from the PCI_INTERRUPT_PIN config register
are 0=device doesn't use interrupts, 1=INTA, ..., 4=INTD.  But the
_PRT table uses 0=INTA, ..., 3=INTD.

This patch converts the _PRT encoding to the PCI encoding immediately
when we add a _PRT entry to the global list.  All the rest of the
code can then use the PCI encoding consistently.

The point of this is to make the interrupt swizzling look the same
as on other architectures, so someday we can unify them.

Signed-off-by: default avatarBjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent cf68b80b

drivers/acpi/pci_irq.c

+8 −7
Original line number Diff line number Diff line
@@ -62,7 +62,7 @@ static DEFINE_SPINLOCK(acpi_prt_lock); 


static inline char pin_name(int pin)

{

	return 'A' + pin;

	return 'A' + pin - 1;

}



/* --------------------------------------------------------------------------
@@ -203,10 +203,15 @@ acpi_pci_irq_add_entry(acpi_handle handle, 
	if (!entry)

		return -ENOMEM;



	/*

	 * Note that the _PRT uses 0=INTA, 1=INTB, etc, while PCI uses

	 * 1=INTA, 2=INTB.  We use the PCI encoding throughout, so convert

	 * it here.

	 */

	entry->id.segment = segment;

	entry->id.bus = bus;

	entry->id.device = (prt->address >> 16) & 0xFFFF;

	entry->pin = prt->pin;

	entry->pin = prt->pin + 1;



	do_prt_fixups(entry, prt);
@@ -425,7 +430,7 @@ acpi_pci_irq_derive(struct pci_dev *dev, 
	 * PCI interrupt routing entry (eg. yenta bridge and add-in card bridge).

	 */

	while (irq < 0 && bridge->bus->self) {

		pin = (pin + PCI_SLOT(bridge->devfn)) % 4;

		pin = (((pin - 1) + PCI_SLOT(bridge->devfn)) % 4) + 1;

		bridge = bridge->bus->self;



		if ((bridge->class >> 8) == PCI_CLASS_BRIDGE_CARDBUS) {
@@ -437,8 +442,6 @@ acpi_pci_irq_derive(struct pci_dev *dev, 
						  pci_name(bridge)));

				return -1;

			}

			/* Pin is from 0 to 3 */

			bridge_pin--;

			pin = bridge_pin;

		}
@@ -483,7 +486,6 @@ int acpi_pci_irq_enable(struct pci_dev *dev) 
				  pci_name(dev)));

		return 0;

	}

	pin--;



	/* 

	 * First we check the PCI IRQ routing table (PRT) for an IRQ.  PRT
@@ -566,7 +568,6 @@ void acpi_pci_irq_disable(struct pci_dev *dev) 
	pin = dev->pin;

	if (!pin)

		return;

	pin--;



	/*

	 * First we check the PCI IRQ routing table (PRT) for an IRQ.

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