Author: jhb
Date: Tue Jul 16 14:42:16 2013
New Revision: 253392
URL: http://svnweb.freebsd.org/changeset/base/253392
Log:
Workaround some broken BIOSes that specify edge-sensitive but active-low
settings for ACPI-enumerated serial ports by forcing any IRQs that use
an ISA IRQ value with these settings to active-high instead of active-low.
This is known to occur with the BIOS on an Intel D2500CCE motherboard.
Tested by: Robert Ames <roberta...@hotmail.com>, lev
Submitted by: Juergen Weiss weiss at uni-mainz.de (original patch)
Modified:
head/sys/dev/acpica/acpi_resource.c
Modified: head/sys/dev/acpica/acpi_resource.c
==============================================================================
--- head/sys/dev/acpica/acpi_resource.c Tue Jul 16 12:22:36 2013
(r253391)
+++ head/sys/dev/acpica/acpi_resource.c Tue Jul 16 14:42:16 2013
(r253392)
@@ -135,6 +135,17 @@ acpi_config_intr(device_t dev, ACPI_RESO
default:
panic("%s: bad resource type %u", __func__, res->Type);
}
+
+#if defined(__amd64__) || defined(__i386__)
+ /*
+ * XXX: Certain BIOSes have buggy AML that specify an IRQ that is
+ * edge-sensitive and active-lo. However, edge-sensitive IRQs
+ * should be active-hi. Force IRQs with an ISA IRQ value to be
+ * active-hi instead.
+ */
+ if (irq < 16 && trig == ACPI_EDGE_SENSITIVE && pol == ACPI_ACTIVE_LOW)
+ pol = ACPI_ACTIVE_HIGH;
+#endif
BUS_CONFIG_INTR(dev, irq, (trig == ACPI_EDGE_SENSITIVE) ?
INTR_TRIGGER_EDGE : INTR_TRIGGER_LEVEL, (pol == ACPI_ACTIVE_HIGH) ?
INTR_POLARITY_HIGH : INTR_POLARITY_LOW);
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