msm: timer: compensate for timer shift in msm_read_timer_count

Some msm targets have timers whose lower bits are unreliable. So, we
present our timers as lower frequency than they actually are, and ignore
the bottom 5 bits on such targets. This compensation was erroneously
removed from the msm_read_timer_count function, so restore it.

This was broken by 94790ec25 "msm: timer: SMP timer support for msm".

Signed-off-by: Jeff Ohlstein <johlstei@codeaurora.org>

diff --git a/arch/arm/mach-msm/timer.c b/arch/arm/mach-msm/timer.c
index 9bfdd5a..2232032 100644 (file)
--- a/arch/arm/mach-msm/timer.c
+++ b/arch/arm/mach-msm/timer.c
@@ -102,7 +102,11 @@ static cycle_t msm_read_timer_count(struct clocksource *cs)
 {
        struct msm_clock *clk = container_of(cs, struct msm_clock, clocksource);
 
-       return readl(clk->global_counter);
+       /*
+        * Shift timer count down by a constant due to unreliable lower bits
+        * on some targets.
+        */
+       return readl(clk->global_counter) >> clk->shift;
 }
 
 static struct msm_clock *clockevent_to_clock(struct clock_event_device *evt)