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Commit 5c3db36b authored by Tero Kristo's avatar Tero Kristo Committed by Tony Lindgren
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OMAP2/3: DMTIMER: Clear pending interrupts when stopping a timer 



OMAP GP timers keep running for a few cycles after they are stopped,
which can cause the timer to expire and generate an interrupt. The
pending interrupt will prevent e.g. OMAP from entering suspend, thus
we ack it manually.  Only applicable on OMAP2/3/4.

Signed-off-by: default avatarTero Kristo <tero.kristo@nokia.com>
Signed-off-by: default avatarKevin Hilman <khilman@deeprootsystems.com>
Signed-off-by: default avatarTony Lindgren <tony@atomide.com>
parent b2d95917

arch/arm/plat-omap/dmtimer.c

+13 −0
Original line number Diff line number Diff line
@@ -551,6 +551,19 @@ void omap_dm_timer_stop(struct omap_dm_timer *timer) 
	if (l & OMAP_TIMER_CTRL_ST) {

		l &= ~0x1;

		omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);

#if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3) || \

			defined(CONFIG_ARCH_OMAP4)

		/* Readback to make sure write has completed */

		omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);

		 /*

		  * Wait for functional clock period x 3.5 to make sure that

		  * timer is stopped

		  */

		udelay(3500000 / clk_get_rate(timer->fclk) + 1);

		/* Ack possibly pending interrupt */

		omap_dm_timer_write_reg(timer, OMAP_TIMER_STAT_REG,

				OMAP_TIMER_INT_OVERFLOW);

#endif

	}

}

EXPORT_SYMBOL_GPL(omap_dm_timer_stop);