From: Jan Weitzel Date: Thu, 17 Mar 2011 12:44:29 +0000 (+0100) Subject: ARM: mxc: Add dummy_get_cycles to avoid access before init is done X-Git-Tag: upstream/snapshot3+hdmi~10744^2^2^2~19 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=93b20e4fdbe1ddc4bef79d968cb1ba453324a499;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git ARM: mxc: Add dummy_get_cycles to avoid access before init is done this is needed to use get_cycles with sched_clock. Accessing timer without enabled clk will result in crash Signed-off-by: Jan Weitzel Signed-off-by: Sascha Hauer --- diff --git a/arch/arm/plat-mxc/time.c b/arch/arm/plat-mxc/time.c index 9f0c261..0142e4b 100644 --- a/arch/arm/plat-mxc/time.c +++ b/arch/arm/plat-mxc/time.c @@ -105,6 +105,11 @@ static void gpt_irq_acknowledge(void) __raw_writel(V2_TSTAT_OF1, timer_base + V2_TSTAT); } +static cycle_t dummy_get_cycles(struct clocksource *cs) +{ + return 0; +} + static cycle_t mx1_2_get_cycles(struct clocksource *cs) { return __raw_readl(timer_base + MX1_2_TCN); @@ -118,7 +123,7 @@ static cycle_t v2_get_cycles(struct clocksource *cs) static struct clocksource clocksource_mxc = { .name = "mxc_timer1", .rating = 200, - .read = mx1_2_get_cycles, + .read = dummy_get_cycles, .mask = CLOCKSOURCE_MASK(32), .flags = CLOCK_SOURCE_IS_CONTINUOUS, }; @@ -129,6 +134,8 @@ static int __init mxc_clocksource_init(struct clk *timer_clk) if (timer_is_v2()) clocksource_mxc.read = v2_get_cycles; + else + clocksource_mxc.read = mx1_2_get_cycles; clocksource_register_hz(&clocksource_mxc, c);