ARM: imx: always use TWD on IMX6Q

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: Shawn Guo <shawnguo@kernel.org>

diff --git a/arch/arm/mach-imx/Kconfig b/arch/arm/mach-imx/Kconfig
index 8973fae25436b1fcd5424dd5c7ed994ae68ed43a..dd905b9602a02d53ebe86764aaf00dbbc4dbe1da 100644 (file)
--- a/arch/arm/mach-imx/Kconfig
+++ b/arch/arm/mach-imx/Kconfig
@@ -526,7 +526,7 @@ config SOC_IMX6Q
        bool "i.MX6 Quad/DualLite support"
        select ARM_ERRATA_764369 if SMP
        select HAVE_ARM_SCU if SMP
-       select HAVE_ARM_TWD if SMP
+       select HAVE_ARM_TWD
        select PCI_DOMAINS if PCI
        select PINCTRL_IMX6Q
        select SOC_IMX6