linux-kernel - [PATCH 10/10] xen/apic: program the apic triggering and polarity properly

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Date:	Fri, 27 Feb 2009 18:14:08 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	the arch/x86 maintainers <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Xen-devel <xen-devel@...ts.xensource.com>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
Subject: [PATCH 10/10] xen/apic: program the apic triggering and polarity properly

From: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>

We were passing the ACPI triggering and polarity levels directly into
the apic - but they have reversed values.  The result was that
all the level-triggered interrupts were edge, and vice-versa.
It's surprising that anything worked at all, but now AHCI works
for me.

Thanks for Gerd Hoffmann for noticing this.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
---
 arch/x86/xen/pci.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/arch/x86/xen/pci.c b/arch/x86/xen/pci.c
index d661c74..fb408ce 100644
--- a/arch/x86/xen/pci.c
+++ b/arch/x86/xen/pci.c
@@ -53,7 +53,9 @@ int xen_register_gsi(u32 gsi, int triggering, int polarity)
 	printk(KERN_DEBUG "xen: --> irq=%d\n", irq);
 
 	if (irq > 0)
-		xen_set_io_apic_routing(irq, triggering, polarity);
+		xen_set_io_apic_routing(irq,
+					triggering == ACPI_EDGE_SENSITIVE ? 0 : 1,
+					polarity == ACPI_ACTIVE_HIGH ? 0 : 1);
 
 	return irq;
 }
-- 
1.6.0.6

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