| From: Benedikt Spranger <b.spranger@linutronix.de> |
| Date: Sat, 6 Mar 2010 17:47:10 +0100 |
| Subject: ARM: AT91: PIT: Remove irq handler when clock event is unused |
| |
| Setup and remove the interrupt handler in clock event mode selection. |
| This avoids calling the (shared) interrupt handler when the device is |
| not used. |
| |
| Signed-off-by: Benedikt Spranger <b.spranger@linutronix.de> |
| Signed-off-by: Thomas Gleixner <tglx@linutronix.de> |
| |
| --- |
| arch/arm/mach-at91/at91rm9200_time.c | 1 + |
| arch/arm/mach-at91/at91sam926x_time.c | 5 ++++- |
| 2 files changed, 5 insertions(+), 1 deletion(-) |
| |
| --- a/arch/arm/mach-at91/at91rm9200_time.c |
| +++ b/arch/arm/mach-at91/at91rm9200_time.c |
| @@ -134,6 +134,7 @@ clkevt32k_mode(enum clock_event_mode mod |
| break; |
| case CLOCK_EVT_MODE_SHUTDOWN: |
| case CLOCK_EVT_MODE_UNUSED: |
| + remove_irq(AT91_ID_SYS, &at91rm9200_timer_irq); |
| case CLOCK_EVT_MODE_RESUME: |
| irqmask = 0; |
| break; |
| --- a/arch/arm/mach-at91/at91sam926x_time.c |
| +++ b/arch/arm/mach-at91/at91sam926x_time.c |
| @@ -77,7 +77,7 @@ static struct clocksource pit_clk = { |
| .flags = CLOCK_SOURCE_IS_CONTINUOUS, |
| }; |
| |
| - |
| +static struct irqaction at91sam926x_pit_irq; |
| /* |
| * Clockevent device: interrupts every 1/HZ (== pit_cycles * MCK/16) |
| */ |
| @@ -86,6 +86,8 @@ pit_clkevt_mode(enum clock_event_mode mo |
| { |
| switch (mode) { |
| case CLOCK_EVT_MODE_PERIODIC: |
| + /* Set up irq handler */ |
| + setup_irq(AT91_ID_SYS, &at91sam926x_pit_irq); |
| /* update clocksource counter */ |
| pit_cnt += pit_cycle * PIT_PICNT(pit_read(AT91_PIT_PIVR)); |
| pit_write(AT91_PIT_MR, (pit_cycle - 1) | AT91_PIT_PITEN |
| @@ -98,6 +100,7 @@ pit_clkevt_mode(enum clock_event_mode mo |
| case CLOCK_EVT_MODE_UNUSED: |
| /* disable irq, leaving the clocksource active */ |
| pit_write(AT91_PIT_MR, (pit_cycle - 1) | AT91_PIT_PITEN); |
| + remove_irq(AT91_ID_SYS, &at91sam926x_pit_irq); |
| break; |
| case CLOCK_EVT_MODE_RESUME: |
| break; |