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target/imx: reload cmp timer outside of the reload ptimer transaction

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When running seL4 tests (https://docs.sel4.systems/projects/sel4test)
on the sabrelight platform, the timer tests fail. The arm/imx6 EPIT
timer interrupt does not fire properly, instead of a e.g. second in
can take up to a minute to finally see the interrupt.

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1263

Signed-off-by: Axel Heider <axel.heider@hensoldt.net>
Message-id: 166663118138.13362.1229967229046092876-0@git.sr.ht
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Axel Heider 2022-10-19 15:09:50 +02:00 committed by Peter Maydell
parent 7764963b92
commit 7719419deb
1 changed files with 7 additions and 2 deletions
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9
hw/timer/imx_epit.c
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@ -275,10 +275,15 @@ static void imx_epit_write(void *opaque, hwaddr offset, uint64_t value,
/* If IOVW bit is set then set the timer value */
ptimer_set_count(s->timer_reload, s->lr);
}
/*
* Commit the change to s->timer_reload, so it can propagate. Otherwise
* the timer interrupt may not fire properly. The commit must happen
* before calling imx_epit_reload_compare_timer(), which reads
* s->timer_reload internally again.
*/
ptimer_transaction_commit(s->timer_reload);
imx_epit_reload_compare_timer(s);
ptimer_transaction_commit(s->timer_cmp);
ptimer_transaction_commit(s->timer_reload);
break;
case 3: /* CMP */