32 lines
1.0 KiB
Diff
32 lines
1.0 KiB
Diff
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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Date: Wed, 6 Apr 2016 17:30:28 +0200
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Subject: [PATCH] ARM: imx: always use TWD on IMX6Q
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Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.6/older/patches-4.6.2-rt5.tar.xz
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There is no reason to limit the TWD to be used on SMP kernels only if the
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hardware has it available.
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On Wandboard i.MX6SOLO, running PREEMPT-RT and cyclictest I see as max
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immediately after start in idle:
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UP : ~90us
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SMP: ~50us
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UP + TWD: ~20us.
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Based on this numbers I prefer the TWD over the slightly slower MXC
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timer.
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Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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---
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arch/arm/mach-imx/Kconfig | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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--- a/arch/arm/mach-imx/Kconfig
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+++ b/arch/arm/mach-imx/Kconfig
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@@ -526,7 +526,7 @@ config SOC_IMX6Q
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bool "i.MX6 Quad/DualLite support"
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select ARM_ERRATA_764369 if SMP
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select HAVE_ARM_SCU if SMP
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- select HAVE_ARM_TWD if SMP
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+ select HAVE_ARM_TWD
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select PCI_DOMAINS if PCI
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select PINCTRL_IMX6Q
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select SOC_IMX6
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