[PATCH RT 04/11] ARM: imx: always use TWD on IMX6Q

From	Steven Rostedt <rostedt@goodmis.org>
Newsgroups	linux.kernel
Subject	[PATCH RT 04/11] ARM: imx: always use TWD on IMX6Q
Date	2016-07-12 19:00 +0200
Message-ID	<rU9cl-7AG-1@gated-at.bofh.it> (permalink)
References	<rU9cl-7AG-3@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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3.12.61-rt82-rc1 stable review patch.
If anyone has any objections, please let me know.

------------------

From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

There is no reason to limit the TWD to be used on SMP kernels only if the
hardware has it available.
On Wandboard i.MX6SOLO, running PREEMPT-RT and cyclictest I see as max
immediately after start in idle:
UP : ~90us
SMP: ~50us
UP + TWD: ~20us.
Based on this numbers I prefer the TWD over the slightly slower MXC
timer.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
 arch/arm/mach-imx/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/mach-imx/Kconfig b/arch/arm/mach-imx/Kconfig
index 29a8af6922a8..79671485618a 100644
--- a/arch/arm/mach-imx/Kconfig
+++ b/arch/arm/mach-imx/Kconfig
@@ -794,7 +794,7 @@ config SOC_IMX6Q
 	select COMMON_CLK
 	select CPU_V7
 	select HAVE_ARM_SCU if SMP
-	select HAVE_ARM_TWD if SMP
+	select HAVE_ARM_TWD
 	select HAVE_IMX_ANATOP
 	select HAVE_IMX_GPC
 	select HAVE_IMX_MMDC
-- 
2.8.1

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[PATCH RT 04/11] ARM: imx: always use TWD on IMX6Q Steven Rostedt <rostedt@goodmis.org> - 2016-07-12 19:00 +0200

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