60 lines
2.2 KiB
Diff
60 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/3.10/patches-3.10.4-rt1.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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---
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arch/arm/mach-at91/at91rm9200_time.c | 1 +
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arch/arm/mach-at91/at91sam926x_time.c | 5 ++++-
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2 files changed, 5 insertions(+), 1 deletion(-)
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Index: linux-stable/arch/arm/mach-at91/at91rm9200_time.c
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===================================================================
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--- linux-stable.orig/arch/arm/mach-at91/at91rm9200_time.c
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+++ linux-stable/arch/arm/mach-at91/at91rm9200_time.c
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@@ -134,6 +134,7 @@ 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(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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Index: linux-stable/arch/arm/mach-at91/at91sam926x_time.c
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===================================================================
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--- linux-stable.orig/arch/arm/mach-at91/at91sam926x_time.c
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+++ linux-stable/arch/arm/mach-at91/at91sam926x_time.c
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@@ -77,7 +77,7 @@ static struct clocksource pit_clk = {
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.flags = CLOCK_SOURCE_IS_CONTINUOUS,
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};
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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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@@ -86,6 +86,8 @@ pit_clkevt_mode(enum clock_event_mode mo
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{
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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(AT91_ID_SYS, &at91sam926x_pit_irq);
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/* update clocksource counter */
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pit_cnt += pit_cycle * PIT_PICNT(pit_read(AT91_PIT_PIVR));
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pit_write(AT91_PIT_MR, (pit_cycle - 1) | AT91_PIT_PITEN
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@@ -98,6 +100,7 @@ pit_clkevt_mode(enum clock_event_mode mo
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case CLOCK_EVT_MODE_UNUSED:
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/* disable irq, leaving the clocksource active */
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pit_write(AT91_PIT_MR, (pit_cycle - 1) | AT91_PIT_PITEN);
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+ remove_irq(AT91_ID_SYS, &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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