From: Feng Tang <feng.tang@intel.com>
To: Ingo Molnar <mingo@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
"H. Peter Anvin" <hpa@zytor.com>,
linux-kernel@vger.kernel.org
Cc: Clemens Ladisch <clemens@ladisch.de>,
John Stultz <john.stultz@linaro.org>,
Feng Tang <feng.tang@intel.com>
Subject: [PATCH 2/2] x86: Add quirk to disable HPET for baytrail platform
Date: Thu, 24 Apr 2014 16:18:18 +0800
Message-ID: <1398327498-13163-2-git-send-email-feng.tang@intel.com> (raw)
In-Reply-To: <1398327498-13163-1-git-send-email-feng.tang@intel.com>
HPET on current Baytrail platform has accuracy problem to be used as
reliable clocksource/clockevent, so add a early quirk to disable it.
Signed-off-by: Feng Tang <feng.tang@intel.com>
---
arch/x86/kernel/early-quirks.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/arch/x86/kernel/early-quirks.c b/arch/x86/kernel/early-quirks.c
index 6e2537c..67c33fd 100644
--- a/arch/x86/kernel/early-quirks.c
+++ b/arch/x86/kernel/early-quirks.c
@@ -17,6 +17,7 @@
#include <asm/dma.h>
#include <asm/io_apic.h>
#include <asm/apic.h>
+#include <asm/hpet.h>
#include <asm/iommu.h>
#include <asm/gart.h>
#include <asm/irq_remapping.h>
@@ -530,6 +531,15 @@ static void __init intel_graphics_stolen(int num, int slot, int func)
}
}
+static void __init force_disable_hpet(int num, int slot, int func)
+{
+#ifdef CONFIG_HPET_TIMER
+ boot_hpet_disable = 1;
+ pr_info("Will Disable HPET for this platform\n");
+#endif
+}
+
+
#define QFLAG_APPLY_ONCE 0x1
#define QFLAG_APPLIED 0x2
#define QFLAG_DONE (QFLAG_APPLY_ONCE|QFLAG_APPLIED)
@@ -567,6 +577,12 @@ static struct chipset early_qrk[] __initdata = {
PCI_BASE_CLASS_BRIDGE, 0, intel_remapping_check },
{ PCI_VENDOR_ID_INTEL, PCI_ANY_ID, PCI_CLASS_DISPLAY_VGA, PCI_ANY_ID,
QFLAG_APPLY_ONCE, intel_graphics_stolen },
+ /*
+ * HPET on current version of Baytrail platform has accuracy
+ * problem, disable it for now
+ */
+ { PCI_VENDOR_ID_INTEL, 0x0f00,
+ PCI_CLASS_BRIDGE_HOST, PCI_ANY_ID, 0, force_disable_hpet},
{}
};
--
1.7.9.5
next prev parent reply index
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-04-24 8:18 [PATCH 1/2] x86, hpet: Make boot_hpet_disable extern Feng Tang
2014-04-24 8:18 ` Feng Tang [this message]
2014-05-08 10:45 ` [tip:x86/urgent] x86/intel: Add quirk to disable HPET for the Baytrail platform tip-bot for Feng Tang
2014-05-08 6:28 ` [PATCH 1/2] x86, hpet: Make boot_hpet_disable extern Feng Tang
2014-05-08 6:32 ` Ingo Molnar
2014-05-08 10:45 ` [tip:x86/urgent] x86/hpet: " tip-bot for Feng Tang
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