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[01/13] OMAP2/3: DMTIMER: Clear pending interrupts when stopping a timer

Message ID 1262973571-25796-2-git-send-email-khilman@deeprootsystems.com (mailing list archive)
State Accepted
Delegated to: Kevin Hilman
Headers show

Commit Message

Kevin Hilman Jan. 8, 2010, 5:59 p.m. UTC
None
diff mbox

Patch

diff --git a/arch/arm/plat-omap/dmtimer.c b/arch/arm/plat-omap/dmtimer.c
index 64f407e..5502ce8 100644
--- a/arch/arm/plat-omap/dmtimer.c
+++ b/arch/arm/plat-omap/dmtimer.c
@@ -551,6 +551,16 @@  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);
+		/* 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);
 	}
 }
 EXPORT_SYMBOL_GPL(omap_dm_timer_stop);