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From 207935003bda17515d6cb323b192e3c00f0463fa Mon Sep 17 00:00:00 2001
From: Thomas Gleixner <tglx@linutronix.de>
Date: Fri, 30 Sep 2011 20:03:37 +0200
Subject: [PATCH 005/270] x86: hpet: Disable MSI on Lenovo W510
MSI based per cpu timers lose interrupts when intel_idle() is enabled
- independent of the c-state. With idle=poll the problem cannot be
observed. We have no idea yet, whether this is a W510 specific issue
or a general chipset oddity. Blacklist the known problem machine.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
arch/x86/kernel/hpet.c | 27 +++++++++++++++++++++++++++
1 file changed, 27 insertions(+)
diff --git a/arch/x86/kernel/hpet.c b/arch/x86/kernel/hpet.c
index ad0de0c..230a200 100644
--- a/arch/x86/kernel/hpet.c
+++ b/arch/x86/kernel/hpet.c
@@ -8,6 +8,7 @@
#include <linux/slab.h>
#include <linux/hpet.h>
#include <linux/init.h>
+#include <linux/dmi.h>
#include <linux/cpu.h>
#include <linux/pm.h>
#include <linux/io.h>
@@ -570,6 +571,30 @@ static void init_one_hpet_msi_clockevent(struct hpet_dev *hdev, int cpu)
#define RESERVE_TIMERS 0
#endif
+static int __init dmi_disable_hpet_msi(const struct dmi_system_id *d)
+{
+ hpet_msi_disable = 1;
+ return 0;
+}
+
+static struct dmi_system_id __initdata dmi_hpet_table[] = {
+ /*
+ * MSI based per cpu timers lose interrupts when intel_idle()
+ * is enabled - independent of the c-state. With idle=poll the
+ * problem cannot be observed. We have no idea yet, whether
+ * this is a W510 specific issue or a general chipset oddity.
+ */
+ {
+ .callback = dmi_disable_hpet_msi,
+ .ident = "Lenovo W510",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
+ DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad W510"),
+ },
+ },
+ {}
+};
+
static void hpet_msi_capability_lookup(unsigned int start_timer)
{
unsigned int id;
@@ -577,6 +602,8 @@ static void hpet_msi_capability_lookup(unsigned int start_timer)
unsigned int num_timers_used = 0;
int i;
+ dmi_check_system(dmi_hpet_table);
+
if (hpet_msi_disable)
return;
--
1.7.10.4
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