4.14-stable review patch. If anyone has any objections, please let me know.
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From: Marek Szyprowski m.szyprowski@samsung.com
commit a7480dbcf983c31d8111f864c848e8a75116a87d upstream.
Since commit 04c8b0f82c7d ("irqchip/gic: Make locking a BL_SWITCHER only feature") coupled CPU idle freezes from time to time on Exynos4210. Later commit 313c8c16ee62 ("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
--- arch/arm/mach-exynos/pm.c | 6 +----- 1 file changed, 1 insertion(+), 5 deletions(-)
--- a/arch/arm/mach-exynos/pm.c +++ b/arch/arm/mach-exynos/pm.c @@ -276,11 +276,7 @@ abort: goto fail;
call_firmware_op(cpu_boot, 1); - - if (soc_is_exynos3250()) - dsb_sev(); - else - arch_send_wakeup_ipi_mask(cpumask_of(1)); + dsb_sev(); } } fail: