58 lines
2.2 KiB
Diff
58 lines
2.2 KiB
Diff
From: Benedikt Spranger <b.spranger@linutronix.de>
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Date: Sat, 6 Mar 2010 17:47:10 +0100
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Subject: ARM: AT91: PIT: Remove irq handler when clock event is unused
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Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.0/patches-4.0.5-rt3.tar.xz
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Setup and remove the interrupt handler in clock event mode selection.
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This avoids calling the (shared) interrupt handler when the device is
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not used.
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Signed-off-by: Benedikt Spranger <b.spranger@linutronix.de>
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Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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[bigeasy: redo the patch with NR_IRQS_LEGACY which is probably required since
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commit 8fe82a55 ("ARM: at91: sparse irq support") which is included since v3.6.
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Patch based on what Sami Pietikäinen <Sami.Pietikainen@wapice.com> suggested].
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Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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---
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arch/arm/mach-at91/at91rm9200_time.c | 1 +
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drivers/clocksource/timer-atmel-pit.c | 4 ++++
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2 files changed, 5 insertions(+)
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--- a/arch/arm/mach-at91/at91rm9200_time.c
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+++ b/arch/arm/mach-at91/at91rm9200_time.c
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@@ -135,6 +135,7 @@ clkevt32k_mode(enum clock_event_mode mod
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break;
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case CLOCK_EVT_MODE_SHUTDOWN:
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case CLOCK_EVT_MODE_UNUSED:
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+ remove_irq(NR_IRQS_LEGACY + AT91_ID_SYS, &at91rm9200_timer_irq);
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case CLOCK_EVT_MODE_RESUME:
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irqmask = 0;
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break;
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--- a/drivers/clocksource/timer-atmel-pit.c
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+++ b/drivers/clocksource/timer-atmel-pit.c
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@@ -90,6 +90,7 @@ static cycle_t read_pit_clk(struct clock
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return elapsed;
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}
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+static struct irqaction at91sam926x_pit_irq;
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/*
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* Clockevent device: interrupts every 1/HZ (== pit_cycles * MCK/16)
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*/
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@@ -100,6 +101,8 @@ pit_clkevt_mode(enum clock_event_mode mo
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switch (mode) {
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case CLOCK_EVT_MODE_PERIODIC:
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+ /* Set up irq handler */
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+ setup_irq(at91sam926x_pit_irq.irq, &at91sam926x_pit_irq);
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/* update clocksource counter */
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data->cnt += data->cycle * PIT_PICNT(pit_read(data->base, AT91_PIT_PIVR));
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pit_write(data->base, AT91_PIT_MR,
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@@ -113,6 +116,7 @@ pit_clkevt_mode(enum clock_event_mode mo
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/* disable irq, leaving the clocksource active */
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pit_write(data->base, AT91_PIT_MR,
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(data->cycle - 1) | AT91_PIT_PITEN);
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+ remove_irq(at91sam926x_pit_irq.irq, &at91sam926x_pit_irq);
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break;
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case CLOCK_EVT_MODE_RESUME:
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break;
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