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linux/arch/arm/mach-exynos
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Marek Szyprowski 2106cd3463 ARM: EXYNOS: Fix coupled CPU idle freeze on Exynos4210 
commit a7480dbcf9 upstream.

Since commit 04c8b0f82c ("irqchip/gic: Make locking a BL_SWITCHER only
feature") coupled CPU idle freezes from time to time on Exynos4210. Later
commit 313c8c16ee ("PM / CPU: replace raw_notifier with atomic_notifier")
changed the context in which the CPU idle code is executed, what results
in fully reproducible freeze all the time. However, almost the same coupled
CPU idle code works fine on Exynos3250 regardless of the changes made in
the mentioned commits.

It turned out that the IPI call used on Exynos4210 is conflicting with the
change done in the first mentioned commit in GIC. Fix this by using the
same code path as for Exynos3250, instead of the IPI call for
synchronization with second CPU core, call dsb_sev() directly.

Tested on Exynos4210-based Trats and Origen boards.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
CC: <stable@vger.kernel.org> # v4.13+
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Acked-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2018-04-24 09:36:24 +02:00
..
include/mach ARM: EXYNOS: Remove unused DMC and CMU offsets and their mappings 2016-08-24 06:42:27 +02:00
common.h ARM: SAMSUNG: Fix missing s5p_init_cpu() declaration 2016-06-22 12:33:14 +02:00
exynos-smc.S ARM: EXYNOS: Add support for secure monitor calls 2013-04-09 01:52:06 +09:00
exynos.c ARM: EXYNOS: Remove Exynos4415 arch code (SoC not supported anymore) 2017-01-18 20:48:00 +02:00
firmware.c ARM: 8641/1: treewide: Replace uses of virt_to_phys with __pa_symbol 2017-02-28 11:06:10 +00:00
headsmp.S ARM: EXYNOS: Fixups for big-endian operation 2016-06-21 13:25:58 +02:00
Kconfig ARM: EXYNOS: Remove Exynos4415 arch code (SoC not supported anymore) 2017-01-18 20:48:00 +02:00
Makefile Topic branch for Exynos MFC changes for v4.8: 2016-06-19 22:39:15 -07:00
mcpm-exynos.c Merge branch 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm 2017-02-28 11:50:53 -08:00
platsmp.c Merge branch 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm 2017-02-28 11:50:53 -08:00
pm.c ARM: EXYNOS: Fix coupled CPU idle freeze on Exynos4210 2018-04-24 09:36:24 +02:00
sleep.S ARM: align .data section 2017-08-14 16:22:55 +01:00
smc.h ARM: EXYNOS: add AFTR mode support for Exynos3250 2015-03-27 02:35:48 +09:00
suspend.c ARM: Convert to using %pOF instead of full_name 2017-08-16 22:25:30 +02:00