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From: Feng Tang <feng.tang@intel.com>
To: tglx@linutronix.de, mingo@elte.hu, hpa@zytor.com,
	linux-kernel@vger.kernel.org,
	John Stultz <john.stultz@linaro.org>
Cc: Clemens Ladisch <clemens@ladisch.de>,
	Andy Lutomirski <luto@amacapital.net>,
	Feng Tang <feng.tang@intel.com>
Subject: [PATCH v2] x86: hpet: Don't default CONFIG_HPET_TIMER to be y for X86_64
Date: Fri, 28 Mar 2014 10:55:16 +0800	[thread overview]
Message-ID: <1395975316-4795-1-git-send-email-feng.tang@intel.com> (raw)

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@intel.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


             reply	other threads:[~2014-03-28  2:56 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-03-28  2:55 Feng Tang [this message]
2014-03-28  7:17 ` [PATCH v2] x86: hpet: Don't default CONFIG_HPET_TIMER to be y for X86_64 Ingo Molnar
2014-03-28  7:37   ` Feng Tang
2014-03-28  8:08     ` Clemens Ladisch
2014-03-28  8:11       ` Ingo Molnar
2014-03-28  8:20         ` Feng Tang
2014-04-15  7:44         ` Feng Tang
2014-04-15  9:00           ` Ingo Molnar
2014-04-15  9:55             ` Feng Tang
2014-04-15 10:42               ` Ingo Molnar
2014-04-15 14:12                 ` Feng Tang
2014-04-16  6:51                   ` Ingo Molnar
2014-04-18  7:18                     ` Feng Tang
2014-04-18  7:49                     ` [RFC PATCH] x86, hpet: Add quirk to disable HPET for baytrail platform Feng Tang
2014-04-18  8:15                       ` Ingo Molnar

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