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x86/intel: Add quirk to disable HPET for the Baytrail platform
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> Cc: Clemens Ladisch <clemens@ladisch.de> Cc: John Stultz <john.stultz@linaro.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: http://lkml.kernel.org/r/1398327498-13163-2-git-send-email-feng.tang@intel.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
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1 changed files with 16 additions and 0 deletions
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@ -17,6 +17,7 @@
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#include <asm/dma.h>
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#include <asm/io_apic.h>
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#include <asm/apic.h>
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#include <asm/hpet.h>
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#include <asm/iommu.h>
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#include <asm/gart.h>
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#include <asm/irq_remapping.h>
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@ -530,6 +531,15 @@ static void __init intel_graphics_stolen(int num, int slot, int func)
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}
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}
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static void __init force_disable_hpet(int num, int slot, int func)
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{
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#ifdef CONFIG_HPET_TIMER
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boot_hpet_disable = 1;
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pr_info("x86/hpet: Will disable the HPET for this platform because it's not reliable\n");
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#endif
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}
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#define QFLAG_APPLY_ONCE 0x1
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#define QFLAG_APPLIED 0x2
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#define QFLAG_DONE (QFLAG_APPLY_ONCE|QFLAG_APPLIED)
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@ -567,6 +577,12 @@ static struct chipset early_qrk[] __initdata = {
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PCI_BASE_CLASS_BRIDGE, 0, intel_remapping_check },
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{ PCI_VENDOR_ID_INTEL, PCI_ANY_ID, PCI_CLASS_DISPLAY_VGA, PCI_ANY_ID,
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QFLAG_APPLY_ONCE, intel_graphics_stolen },
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/*
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* HPET on current version of Baytrail platform has accuracy
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* problems, disable it for now:
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*/
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{ PCI_VENDOR_ID_INTEL, 0x0f00,
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PCI_CLASS_BRIDGE_HOST, PCI_ANY_ID, 0, force_disable_hpet},
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{}
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};
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