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ARM: OMAP: Fix spurious interrupts when using timer match feature 

The OMAP DMTIMERs can generate an interrupt when the timer counter value
matches the value stored in the timer's match register. When using this
feature spurious interrupts were seen, because the compare logic is being
enabled before the match value is loaded and according to the documentation
the match value must be loaded before the compare logic is enable.

The reset value for the timer counter and match registers is 0 and hence,
by enabling the compare logic before the actual match value is loaded a
spurious interrupt can be generated as the reset values match.

Signed-off-by: Jon Hunter <jon-hunter@ti.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
This commit is contained in:
Jon Hunter 2012-10-04 18:17:42 -05:00
parent 1eaff71017
commit 991ad16a92
1 changed files with 1 additions and 1 deletions
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2
arch/arm/plat-omap/dmtimer.c
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@ -584,8 +584,8 @@ int omap_dm_timer_set_match(struct omap_dm_timer *timer, int enable,
l |= OMAP_TIMER_CTRL_CE;
else
l &= ~OMAP_TIMER_CTRL_CE;
omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
omap_dm_timer_write_reg(timer, OMAP_TIMER_MATCH_REG, match);
omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
/* Save the context */
timer->context.tclr = l;