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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
This commit is contained in:
Peter Maydell 2018-07-09 14:51:34 +01:00
parent 086ede32af
commit 6583080ed8
1 changed files with 1 additions and 1 deletions
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hw/timer/cmsdk-apb-timer.c
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@ -201,7 +201,7 @@ static void cmsdk_apb_timer_realize(DeviceState *dev, Error **errp)
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);