From: Soren Brinkmann <soren.brinkmann@xilinx.com>
To: Thomas Gleixner <tglx@linutronix.de>,
Daniel Lezcano <daniel.lezcano@linaro.org>,
Michal Simek <michal.simek@xilinx.com>
Cc: linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
"Sören Brinkmann" <soren.brinkmann@xilinx.com>,
"Russell King" <linux@arm.linux.org.uk>
Subject: [PATCH v4 3/4] arm: zynq: Don't use arm_global_timer with cpufreq
Date: Wed, 19 Feb 2014 15:14:43 -0800 [thread overview]
Message-ID: <1392851684-29950-4-git-send-email-soren.brinkmann@xilinx.com> (raw)
In-Reply-To: <1392851684-29950-1-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>
---
v4:
- no change
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
--
1.9.0.1.g4196000
next prev parent reply other threads:[~2014-02-19 23:15 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-02-19 23:14 [PATCH v4 0/4] ARM: zynq: cpufreq support Soren Brinkmann
2014-02-19 23:14 ` [PATCH v4 1/4] clocksource/cadence_ttc: Call clockevents_update_freq() with IRQs enabled Soren Brinkmann
2014-02-19 23:14 ` [PATCH v4 2/4] clocksource/cadence_ttc: Overhaul clocksource frequency adjustment Soren Brinkmann
2014-02-19 23:14 ` Soren Brinkmann [this message]
2014-02-19 23:14 ` [PATCH v4 4/4] arm: zynq: Add support for cpufreq Soren Brinkmann
2014-02-27 17:52 ` [PATCH v4 0/4] ARM: zynq: cpufreq support Sören Brinkmann
2014-02-28 6:58 ` Daniel Lezcano
[not found] ` <20140227175217.GW13293@xsjandreislx>
2014-02-28 6:26 ` Michal Simek
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