releases/4.4.177/clocksource-drivers-exynos_mct-clear-timer-interrupt-when-shutdown.patch

   1 From d2f276c8d3c224d5b493c42b6cf006ae4e64fb1c Mon Sep 17 00:00:00 2001
   2 From: Stuart Menefy <stuart.menefy@mathembedded.com>
   3 Date: Sun, 10 Feb 2019 22:51:14 +0000
   4 Subject: clocksource/drivers/exynos_mct: Clear timer interrupt when shutdown
   5
   6 From: Stuart Menefy <stuart.menefy@mathembedded.com>
   7
   8 commit d2f276c8d3c224d5b493c42b6cf006ae4e64fb1c upstream.
   9
  10 When shutting down the timer, ensure that after we have stopped the
  11 timer any pending interrupts are cleared. This fixes a problem when
  12 suspending, as interrupts are disabled before the timer is stopped,
  13 so the timer interrupt may still be asserted, preventing the system
  14 entering a low power state when the wfi is executed.
  15
  16 Signed-off-by: Stuart Menefy <stuart.menefy@mathembedded.com>
  17 Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
  18 Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
  19 Cc: <stable@vger.kernel.org> # v4.3+
  20 Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
  21 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  22
  23 ---
  24  drivers/clocksource/exynos_mct.c |    1 +
  25  1 file changed, 1 insertion(+)
  26
  27 --- a/drivers/clocksource/exynos_mct.c
  28 +++ b/drivers/clocksource/exynos_mct.c
  29 @@ -402,6 +402,7 @@ static int set_state_shutdown(struct clo
  30
  31         mevt = container_of(evt, struct mct_clock_event_device, evt);
  32         exynos4_mct_tick_stop(mevt);
  33 +       exynos4_mct_tick_clear(mevt);
  34         return 0;
  35  }
  36