From 869e92b5c392eb6b2c7b398b878c435442b8e9dd Mon Sep 17 00:00:00 2001 From: Dmitry Osipenko Date: Mon, 6 Jun 2016 16:59:31 +0100 Subject: [PATCH] hw/ptimer: Support "on the fly" timer mode switch Allow switching between periodic <-> oneshot modes while timer is running. Signed-off-by: Dmitry Osipenko Reviewed-by: Peter Crosthwaite Message-id: f030be6e28fbd219e1e8d22297aee367bd9af5bb.1464367869.git.digetx@gmail.com Signed-off-by: Peter Maydell --- hw/core/ptimer.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) diff --git a/hw/core/ptimer.c b/hw/core/ptimer.c index 76ebe9b48cc2..d0b2f38082b6 100644 --- a/hw/core/ptimer.c +++ b/hw/core/ptimer.c @@ -163,16 +163,17 @@ void ptimer_set_count(ptimer_state *s, uint64_t count) void ptimer_run(ptimer_state *s, int oneshot) { - if (s->enabled) { - return; - } - if (s->period == 0) { + bool was_disabled = !s->enabled; + + if (was_disabled && s->period == 0) { fprintf(stderr, "Timer with period zero, disabling\n"); return; } s->enabled = oneshot ? 2 : 1; - s->next_event = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); - ptimer_reload(s); + if (was_disabled) { + s->next_event = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); + ptimer_reload(s); + } } /* Pause a timer. Note that this may cause it to "lose" time, even if it