diff mbox

[v11,3/7] hw/ptimer: Update .delta on period/freq change

Message ID ee1f0c74b440ec31814bf0c8b8c84d4e4e1097fa.1453402860.git.digetx@gmail.com (mailing list archive)
State New, archived
Headers show

Commit Message

Dmitry Osipenko Jan. 21, 2016, 7:03 p.m. UTC 
Delta value must be updated on period/freq change, otherwise running timer
would be restarted (counter reloaded with old delta). Only m68k/mcf520x
and arm/arm_timer devices are currently doing freq change correctly, i.e.
stopping the timer. Perform delta update to fix affected devices and
eliminate potential further mistakes.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Reviewed-by: Peter Crosthwaite <crosthwaite.peter@gmail.com>
---
 hw/core/ptimer.c | 2 ++
 1 file changed, 2 insertions(+)
diff mbox

Patch

diff --git a/hw/core/ptimer.c b/hw/core/ptimer.c
index cb50d30..904a77b 100644
--- a/hw/core/ptimer.c
+++ b/hw/core/ptimer.c
@@ -189,6 +189,7 @@  void ptimer_stop(ptimer_state *s)
 /* Set counter increment interval in nanoseconds.  */
 void ptimer_set_period(ptimer_state *s, int64_t period)
 {
+    s->delta = ptimer_get_count(s);
     s->period = period;
     s->period_frac = 0;
     if (s->enabled) {
@@ -200,6 +201,7 @@  void ptimer_set_period(ptimer_state *s, int64_t period)
 /* Set counter frequency in Hz.  */
 void ptimer_set_freq(ptimer_state *s, uint32_t freq)
 {
+    s->delta = ptimer_get_count(s);
     s->period = 1000000000ll / freq;
     s->period_frac = (1000000000ll << 32) / freq;
     if (s->enabled) {