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From: soren.brinkmann@xilinx.com (Soren Brinkmann)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v3 6/7] arm: zynq: Don't use arm_global_timer with cpufreq
Date: Mon,  3 Feb 2014 14:34:36 -0800	[thread overview]
Message-ID: <1391466877-28908-7-git-send-email-soren.brinkmann@xilinx.com> (raw)
In-Reply-To: <1391466877-28908-1-git-send-email-soren.brinkmann@xilinx.com>

The timer frequency of the arm_global_timer depends on the CPU
frequency. With cpufreq altering that frequency the arm_global_timer
does not maintain a stable time base. Therefore don't enable that timer
in case cpufreq is enabled.

Cc: Russell King <linux@arm.linux.org.uk>
Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
---
 arch/arm/mach-zynq/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/mach-zynq/Kconfig b/arch/arm/mach-zynq/Kconfig
index 6b04260aa142..f84fab14f0b7 100644
--- a/arch/arm/mach-zynq/Kconfig
+++ b/arch/arm/mach-zynq/Kconfig
@@ -13,6 +13,6 @@ config ARCH_ZYNQ
 	select HAVE_SMP
 	select SPARSE_IRQ
 	select CADENCE_TTC_TIMER
-	select ARM_GLOBAL_TIMER
+	select ARM_GLOBAL_TIMER if !CPU_FREQ
 	help
 	  Support for Xilinx Zynq ARM Cortex A9 Platform
-- 
1.8.5.3

  parent reply	other threads:[~2014-02-03 22:34 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-02-03 22:34 [PATCH v3 0/7] ARM: zynq: cpufreq support Soren Brinkmann
2014-02-03 22:34 ` [PATCH v3 1/7] time: Serialize calls to 'clockevents_update_freq' in the timing core Soren Brinkmann
2014-02-03 22:34 ` [PATCH v3 2/7] time: clockevents: Adjust timer interval when frequency changes Soren Brinkmann
2014-02-03 22:34 ` [PATCH v3 3/7] clocksource/cadence_ttc: Call clockevents_update_freq() with IRQs enabled Soren Brinkmann
2014-02-03 22:34 ` [PATCH v3 4/7] clocksource/cadence_ttc: Overhaul clocksource frequency adjustment Soren Brinkmann
2014-02-03 22:34 ` [PATCH v3 5/7] clocksource/cadence_ttc: Use only one counter Soren Brinkmann
2014-02-04 20:41   ` Thomas Gleixner
2014-02-10 17:46     ` Sören Brinkmann
2014-02-03 22:34 ` Soren Brinkmann [this message]
2014-02-03 22:34 ` [PATCH v3 7/7] arm: zynq: Add support for cpufreq Soren Brinkmann

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