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authorTomasz Figa <t.figa@samsung.com>2013-04-23 19:46:29 +0400
committerOlof Johansson <olof@lixom.net>2013-04-28 23:17:01 +0400
commit6fe4dfd041dadbc1cc2460ed8680f2734dc3dc95 (patch)
tree05c695f8677efcdfbaa6a3e8e84b7c57d940f172 /drivers/clocksource/samsung_pwm_timer.c
parente9b852b8a7bc0217a03afff07fad34093e087542 (diff)
downloadlinux-6fe4dfd041dadbc1cc2460ed8680f2734dc3dc95.tar.xz
clocksource: samsung_pwm_timer: Correct programming of clock events
In current code, the tick count value programmed to the hardware is always decremented by one. This is reasonable for periodic mode, since there is one extra tick between 0 and COUNT (after reloading), but it makes oneshot events happen 1 tick earlier than requested, because the interrupt is triggered on transition from 1 to 0. This patch removes the decrementation from PWM channel setup code and moves it instead to periodic timer setup, to make both periodic and oneshot modes work correctly. Signed-off-by: Tomasz Figa <t.figa@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Reviewed-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Kukjin Kim <kgene.kim@samsung.com> Signed-off-by: Olof Johansson <olof@lixom.net>
Diffstat (limited to 'drivers/clocksource/samsung_pwm_timer.c')
-rw-r--r--drivers/clocksource/samsung_pwm_timer.c6
1 files changed, 2 insertions, 4 deletions
diff --git a/drivers/clocksource/samsung_pwm_timer.c b/drivers/clocksource/samsung_pwm_timer.c
index cb866156b8b0..92b2f130ae9b 100644
--- a/drivers/clocksource/samsung_pwm_timer.c
+++ b/drivers/clocksource/samsung_pwm_timer.c
@@ -138,8 +138,6 @@ static void samsung_time_setup(unsigned int channel, unsigned long tcnt)
tcon = __raw_readl(pwm.base + REG_TCON);
- tcnt--;
-
tcon &= ~(TCON_START(tcon_chan) | TCON_AUTORELOAD(tcon_chan));
tcon |= TCON_MANUALUPDATE(tcon_chan);
@@ -187,7 +185,7 @@ static int samsung_set_next_event(unsigned long cycles,
static void samsung_timer_resume(void)
{
/* event timer restart */
- samsung_time_setup(pwm.event_id, pwm.clock_count_per_tick);
+ samsung_time_setup(pwm.event_id, pwm.clock_count_per_tick - 1);
samsung_time_start(pwm.event_id, true);
/* source timer restart */
@@ -202,7 +200,7 @@ static void samsung_set_mode(enum clock_event_mode mode,
switch (mode) {
case CLOCK_EVT_MODE_PERIODIC:
- samsung_time_setup(pwm.event_id, pwm.clock_count_per_tick);
+ samsung_time_setup(pwm.event_id, pwm.clock_count_per_tick - 1);
samsung_time_start(pwm.event_id, true);
break;