It seems that there is an irq number mismatch in the "arm-at91-pit-remove-irq-handler-when-clock-is-unused.patch".
The patch adds setup_irq() and remove_irq() calls which have different irq number than the base driver.
If I'm correct, the irq number should be NR_IRQS_LEGACY + AT91_ID_SYS instead of only AT91_ID_SYS.
I have attached a fixed patch for 3.6.9-rt21. I tested it with SAMA5D35, and it removed the
"Trying to free already-free IRQ 1" boot warnings.
BR,
Sami Pietikäinen
Index: linux-stable/arch/arm/mach-at91/at91rm9200_time.c
===================================================================
--- linux-stable.orig/arch/arm/mach-at91/at91rm9200_time.c
+++ linux-stable/arch/arm/mach-at91/at91rm9200_time.c
@@ -130,6 +130,7 @@ clkevt32k_mode(enum clock_event_mode mod
break;
case CLOCK_EVT_MODE_SHUTDOWN:
case CLOCK_EVT_MODE_UNUSED:
+ remove_irq(NR_IRQS_LEGACY + AT91_ID_SYS, &at91rm9200_timer_irq);
case CLOCK_EVT_MODE_RESUME:
irqmask = 0;
break;
Index: linux-stable/arch/arm/mach-at91/at91sam926x_time.c
===================================================================
--- linux-stable.orig/arch/arm/mach-at91/at91sam926x_time.c
+++ linux-stable/arch/arm/mach-at91/at91sam926x_time.c
@@ -67,7 +67,7 @@ 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)
*/
@@ -76,6 +76,8 @@ pit_clkevt_mode(enum clock_event_mode mo
{
switch (mode) {
case CLOCK_EVT_MODE_PERIODIC:
+ /* Set up irq handler */
+ setup_irq(at91sam926x_pit_irq.irq, &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
@@ -88,6 +90,7 @@ 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(at91sam926x_pit_irq.irq, &at91sam926x_pit_irq);
break;
case CLOCK_EVT_MODE_RESUME:
break;
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