| From | Daniel Lezcano <> | Subject | [PATCH 60/71] clocksource: qcom: Implement read_current_timer for udelay | Date | Fri, 23 May 2014 12:31:40 +0200 |
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From: Stephen Boyd <sboyd@codeaurora.org>
Setup the same timer used as the clocksource to be used as the read_current_timer implementation. This allows us to support a stable udelay implementation on MSMs where it's possible for the CPUs to scale speeds independently of one another.
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> --- drivers/clocksource/qcom-timer.c | 13 +++++++++++++ 1 file changed, 13 insertions(+)
diff --git a/drivers/clocksource/qcom-timer.c b/drivers/clocksource/qcom-timer.c index e807acf..8d115db 100644 --- a/drivers/clocksource/qcom-timer.c +++ b/drivers/clocksource/qcom-timer.c @@ -26,6 +26,8 @@ #include <linux/of_irq.h> #include <linux/sched_clock.h> +#include <asm/delay.h> + #define TIMER_MATCH_VAL 0x0000 #define TIMER_COUNT_VAL 0x0004 #define TIMER_ENABLE 0x0008 @@ -179,6 +181,15 @@ static u64 notrace msm_sched_clock_read(void) return msm_clocksource.read(&msm_clocksource); } +static unsigned long msm_read_current_timer(void) +{ + return msm_clocksource.read(&msm_clocksource); +} + +static struct delay_timer msm_delay_timer = { + .read_current_timer = msm_read_current_timer, +}; + static void __init msm_timer_init(u32 dgt_hz, int sched_bits, int irq, bool percpu) { @@ -217,6 +228,8 @@ err: if (res) pr_err("clocksource_register failed\n"); sched_clock_register(msm_sched_clock_read, sched_bits, dgt_hz); + msm_delay_timer.freq = dgt_hz; + register_current_timer_delay(&msm_delay_timer); } #ifdef CONFIG_ARCH_QCOM -- 1.7.9.5
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