commit 6583080ed87ea218acae59f1c52b7b11ffec240d
author Peter Maydell <peter.maydell@linaro.org> Mon Jul 09 14:51:34 2018 +0100
committer Peter Maydell <peter.maydell@linaro.org> Mon Jul 09 14:51:34 2018 +0100
tree 257f2c55bcd4fe901a75fefc132a002e52ca3276
parent 086ede32afc9c70de3d75c4fb91c63db790cbd5c

hw/timer/cmsdk-apb-timer: Correct ptimer policy settings

The CMSDK timer interrupt triggers when the counter goes from 1 to 0,
so we want to trigger immediately, rather than waiting for a
clock cycle. Drop the incorrect NO_IMMEDIATE_TRIGGER setting.
We also do not want to get an interrupt if the guest sets the
counter directly to zero, so use the new TRIGGER_ONLY_ON_DECREMENT
policy.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Message-id: 20180703171044.9503-3-peter.maydell@linaro.org

hw/timer/cmsdk-apb-timer.c

diff --git a/hw/timer/cmsdk-apb-timer.c b/hw/timer/cmsdk-apb-timer.c
index 9878746..1f99081 100644
--- a/hw/timer/cmsdk-apb-timer.c
+++ b/hw/timer/cmsdk-apb-timer.c
@@ -201,7 +201,7 @@
     bh = qemu_bh_new(cmsdk_apb_timer_tick, s);
     s->timer = ptimer_init(bh,
                            PTIMER_POLICY_WRAP_AFTER_ONE_PERIOD |
-                           PTIMER_POLICY_NO_IMMEDIATE_TRIGGER |
+                           PTIMER_POLICY_TRIGGER_ONLY_ON_DECREMENT |
                            PTIMER_POLICY_NO_IMMEDIATE_RELOAD |
                            PTIMER_POLICY_NO_COUNTER_ROUND_DOWN);