Messages in this thread Patch in this message | | | From | Feng Tang <> | Subject | [PATCH 2/2] x86: Add quirk to disable HPET for baytrail platform | Date | Thu, 24 Apr 2014 16:18:18 +0800 |
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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
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