[PATCH 09/17] OMAP3: PM: Ack pending interrupts before entering suspend

Tero Kristo
2009-10-16T11:04:29Z

From: Tero Kristo <tero.kristo@nokia.com>

Suspending drivers may still generate interrupts just before their suspend is
completed. Any pending interrupts here will prevent sleep.

Signed-off-by: Tero Kristo <tero.kristo@nokia.com>
---
arch/arm/mach-omap2/irq.c | 2 +-
arch/arm/mach-omap2/pm34xx.c | 2 ++
arch/arm/plat-omap/include/mach/irqs.h | 1 +
3 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/arch/arm/mach-omap2/irq.c b/arch/arm/mach-omap2/irq.c
index aceedd8..4ed05e9 100644
--- a/arch/arm/mach-omap2/irq.c
+++ b/arch/arm/mach-omap2/irq.c
@@ -101,7 +101,7 @@ static int omap_check_spurious(unsigned int irq)
}

/* XXX: FIQ and additional INTC support (only MPU at the moment) */
-static void omap_ack_irq(unsigned int irq)
+void omap_ack_irq(unsigned int irq)
{
intc_bank_write_reg(0x1, &irq_banks[0], INTC_CONTROL);
}
diff --git a/arch/arm/mach-omap2/pm34xx.c b/arch/arm/mach-omap2/pm34xx.c
index 5854fa7..6a41811 100644
--- a/arch/arm/mach-omap2/pm34xx.c
+++ b/arch/arm/mach-omap2/pm34xx.c
@@ -778,6 +778,8 @@ static int omap3_pm_suspend(void)

omap_uart_prepare_suspend();

+ /* Ack pending IRQs, as a pending IRQ will cause the suspend to fail */
+ omap_ack_irq(0);
regset_save_on_suspend = 1;
omap_sram_idle();
regset_save_on_suspend = 0;
diff --git a/arch/arm/plat-omap/include/mach/irqs.h b/arch/arm/plat-omap/include/mach/irqs.h
index 2473910..d56be1c 100644
--- a/arch/arm/plat-omap/include/mach/irqs.h
+++ b/arch/arm/plat-omap/include/mach/irqs.h
@@ -483,6 +483,7 @@
#ifndef __ASSEMBLY__
extern void omap_init_irq(void);
extern int omap_irq_pending(void);
+extern void omap_ack_irq(unsigned int irq);
void omap3_intc_save_context(void);
void omap3_intc_restore_context(void);
#endif
--
1.5.4.3