From df51a84d93e776b7481d937ccd60be1b27d320c5 Mon Sep 17 00:00:00 2001 From: Imre Deak Date: Mon, 25 Sep 2006 12:41:21 +0300 Subject: ARM: OMAP: timer32k: fix tick count calculation when reprogramming Reprogramming takes places before putting the CPU into idle mode if the dynamic tick option is enabled. The timer is then set to expire at the next pending timer event. Because some time has already passed since the last reported jiffy we have to wait less than the time specified in jiffies. Also make sure we don't set a load value of 0 whose outcome is unspecified according to the TRM. Signed-off-by: Imre Deak Signed-off-by: Juha Yrjola Signed-off-by: Tony Lindgren --- arch/arm/plat-omap/timer32k.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) (limited to 'arch') diff --git a/arch/arm/plat-omap/timer32k.c b/arch/arm/plat-omap/timer32k.c index 281ecc7fcdf..f7b4e89de51 100644 --- a/arch/arm/plat-omap/timer32k.c +++ b/arch/arm/plat-omap/timer32k.c @@ -105,6 +105,8 @@ static inline unsigned long omap_32k_timer_read(int reg) static inline void omap_32k_timer_start(unsigned long load_val) { + if (!load_val) + load_val = 1; omap_32k_timer_write(load_val, OMAP1_32K_TIMER_TVR); omap_32k_timer_write(0x0f, OMAP1_32K_TIMER_CR); } @@ -230,7 +232,15 @@ static irqreturn_t omap_32k_timer_interrupt(int irq, void *dev_id, */ void omap_32k_timer_reprogram(unsigned long next_tick) { - omap_32k_timer_start(JIFFIES_TO_HW_TICKS(next_tick, 32768) + 1); + unsigned long ticks = JIFFIES_TO_HW_TICKS(next_tick, 32768) + 1; + unsigned long now = omap_32k_sync_timer_read(); + unsigned long idled = now - omap_32k_last_tick; + + if (idled + 1 < ticks) + ticks -= idled; + else + ticks = 1; + omap_32k_timer_start(ticks); } static struct irqaction omap_32k_timer_irq; -- cgit v1.2.3