ACPI / resources: call acpi_get_override_irq() only for legacy IRQ resources

acpi_get_override_irq() was added because there was a problem with
buggy BIOSes passing wrong IRQ() resource for the RTC IRQ.  The
commit that added the workaround was 61fd47e0c8476 (ACPI: fix two
IRQ8 issues in IOAPIC mode).

With ACPI 5 enumerated devices there are typically one or more
extended IRQ resources per device (and these IRQs can be shared).
However, the acpi_get_override_irq() workaround forces all IRQs in
range 0 - 15 (the legacy ISA IRQs) to be edge triggered, active high
as can be seen from the dmesg below:

	ACPI: IRQ 6 override to edge, high
	ACPI: IRQ 7 override to edge, high
	ACPI: IRQ 7 override to edge, high
	ACPI: IRQ 13 override to edge, high

Also /proc/interrupts for the I2C controllers (INT33C2 and INT33C3) shows
the same thing:

	7:          4          0          0          0   IO-APIC-edge INT33C2:00, INT33C3:00

The _CSR method for INT33C2 (and INT33C3) device returns following
resource:

	Interrupt (ResourceConsumer, Level, ActiveLow, Shared,,, )
	{
		0x00000007,
	}

which states that this is supposed to be level triggered, active low,
shared IRQ instead.

Fix this by making sure that acpi_get_override_irq() gets only called
when we are dealing with legacy IRQ() or IRQNoFlags() descriptors.

While we are there, correct pr_warning() to print the right triggering
value.

This change turns out to be necessary to make DMA work correctly on
systems based on the Intel Lynxpoint PCH (Platform Controller Hub).

[rjw: Changelog]
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Cc: 3.9+ <stable@vger.kernel.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 11 insertions, 5 deletions

diff --git a/drivers/acpi/resource.c b/drivers/acpi/resource.c
index a3868f6c222a..3322b47ab7ca 100644
--- a/drivers/acpi/resource.c
+++ b/drivers/acpi/resource.c
@@ -304,7 +304,8 @@ static void acpi_dev_irqresource_disabled(struct resource *res, u32 gsi)
 }
 
 static void acpi_dev_get_irqresource(struct resource *res, u32 gsi,
-                                     u8 triggering, u8 polarity, u8 shareable)
+                                     u8 triggering, u8 polarity, u8 shareable,
+                                     bool legacy)
 {
         int irq, p, t;
 
@@ -317,14 +318,19 @@ static void acpi_dev_get_irqresource(struct resource *res, u32 gsi,
          * In IO-APIC mode, use overrided attribute. Two reasons:
          * 1. BIOS bug in DSDT
          * 2. BIOS uses IO-APIC mode Interrupt Source Override
+         *
+         * We do this only if we are dealing with IRQ() or IRQNoFlags()
+         * resource (the legacy ISA resources). With modern ACPI 5 devices
+         * using extended IRQ descriptors we take the IRQ configuration
+         * from _CRS directly.
          */
-        if (!acpi_get_override_irq(gsi, &t, &p)) {
+        if (legacy && !acpi_get_override_irq(gsi, &t, &p)) {
                 u8 trig = t ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE;
                 u8 pol = p ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH;
 
                 if (triggering != trig || polarity != pol) {
                         pr_warning("ACPI: IRQ %d override to %s, %s\n", gsi,
-                                   t ? "edge" : "level", p ? "low" : "high");
+                                   t ? "level" : "edge", p ? "low" : "high");
                         triggering = trig;
                         polarity = pol;
                 }
@@ -373,7 +379,7 @@ bool acpi_dev_resource_interrupt(struct acpi_resource *ares, int index,
                 }
                 acpi_dev_get_irqresource(res, irq->interrupts[index],
                                          irq->triggering, irq->polarity,
-                                         irq->sharable);
+                                         irq->sharable, true);
                 break;
         case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
                 ext_irq = &ares->data.extended_irq;
@@ -383,7 +389,7 @@ bool acpi_dev_resource_interrupt(struct acpi_resource *ares, int index,
                 }
                 acpi_dev_get_irqresource(res, ext_irq->interrupts[index],
                                          ext_irq->triggering, ext_irq->polarity,
-                                         ext_irq->sharable);
+                                         ext_irq->sharable, false);
                 break;
         default:
                 return false;