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Commit 62187910 authored by Feng Tang's avatar Feng Tang Committed by Ingo Molnar
Browse files

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: default avatarFeng 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: default avatarIngo Molnar <mingo@kernel.org>
parent f10f383d

arch/x86/kernel/early-quirks.c

+16 −0
Original line number Diff line number Diff line
@@ -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("x86/hpet: Will disable the HPET for this platform because it's not reliable\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

	 * problems, disable it for now:

	 */

	{ PCI_VENDOR_ID_INTEL, 0x0f00,

		PCI_CLASS_BRIDGE_HOST, PCI_ANY_ID, 0, force_disable_hpet},

	{}

};