ARM: at91: rm9200 fix time support

since commit 838a2ae80a6ab52139fb1bf0a93ea8c5eff94488
Author: Shawn Guo <shawn.guo@linaro.org>
Date:   Sat Jan 12 11:50:05 2013 +0000

ARM: use clockevents_config_and_register() where possible

The timer is wrongly configured and result in a nice crash
so revert it on rm9200 timer.

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Cc: stable <stable@vger.kernel.org> # 3.8+
Cc: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>

diff --git a/arch/arm/mach-at91/at91rm9200_time.c b/arch/arm/mach-at91/at91rm9200_time.c
index 2acdff4c1dfea8c72c7106dff630a4870d6e70a9..180b3024bec3ab36cc2d7cdb62e92d7b2298d297 100644 (file)
--- a/arch/arm/mach-at91/at91rm9200_time.c
+++ b/arch/arm/mach-at91/at91rm9200_time.c
@@ -174,6 +174,7 @@ clkevt32k_next_event(unsigned long delta, struct clock_event_device *dev)
 static struct clock_event_device clkevt = {
        .name           = "at91_tick",
        .features       = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
+       .shift          = 32,
        .rating         = 150,
        .set_next_event = clkevt32k_next_event,
        .set_mode       = clkevt32k_mode,
@@ -264,9 +265,11 @@ void __init at91rm9200_timer_init(void)
        at91_st_write(AT91_ST_RTMR, 1);
 
        /* Setup timer clockevent, with minimum of two ticks (important!!) */
+       clkevt.mult = div_sc(AT91_SLOW_CLOCK, NSEC_PER_SEC, clkevt.shift);
+       clkevt.max_delta_ns = clockevent_delta2ns(AT91_ST_ALMV, &clkevt);
+       clkevt.min_delta_ns = clockevent_delta2ns(2, &clkevt) + 1;
        clkevt.cpumask = cpumask_of(0);
-       clockevents_config_and_register(&clkevt, AT91_SLOW_CLOCK,
-                                       2, AT91_ST_ALMV);
+       clockevents_register_device(&clkevt);
 
        /* register clocksource */
        clocksource_register_hz(&clk32k, AT91_SLOW_CLOCK);