linux-kernel - [PATCH v2] x86: hpet: Don't default CONFIG_HPET_TIMER to be y for X86

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Date:	Fri, 28 Mar 2014 10:55:16 +0800
From:	Feng Tang <feng.tang@...el.com>
To:	tglx@...utronix.de, mingo@...e.hu, hpa@...or.com,
	linux-kernel@...r.kernel.org, John Stultz <john.stultz@...aro.org>
Cc:	Clemens Ladisch <clemens@...isch.de>,
	Andy Lutomirski <luto@...capital.net>,
	Feng Tang <feng.tang@...el.com>
Subject: [PATCH v2] x86: hpet: Don't default CONFIG_HPET_TIMER to be y for X86_64

On many new phone/tablet platforms like Baytrail/Merrifield etc,
the HPET are either defeatured or has some problem to be used
as a reliable timer. As these platforms also have X86_64, we
should not make HPET_TIMER default y for all X86_64.

Signed-off-by: Feng Tang <feng.tang@...el.com>
---
 arch/x86/Kconfig |    7 +++----
 1 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 0af5250..7f2fb4b 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -695,8 +695,7 @@ config X86_CYCLONE_TIMER
 source "arch/x86/Kconfig.cpu"
 
 config HPET_TIMER
-	def_bool X86_64
-	prompt "HPET Timer Support" if X86_32
+	prompt "HPET Timer Support"
 	---help---
 	  Use the IA-PC HPET (High Precision Event Timer) to manage
 	  time in preference to the PIT and RTC, if a HPET is
@@ -709,9 +708,9 @@ config HPET_TIMER
 
 	  You can safely choose Y here.  However, HPET will only be
 	  activated if the platform and the BIOS support this feature.
-	  Otherwise the 8254 will be used for timing services.
 
-	  Choose N to continue using the legacy 8254 timer.
+	  Choose N to use the legacy 8254 timer or the latest
+	  lapic_timer+tsc solution.
 
 config HPET_EMULATE_RTC
 	def_bool y
-- 
1.7.0.4

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