diff options
| author | Daniel Lezcano <daniel.lezcano@linaro.org> | 2015-11-08 23:24:28 +0100 |
|---|---|---|
| committer | Daniel Lezcano <daniel.lezcano@linaro.org> | 2015-12-15 09:42:20 +0100 |
| commit | cce483e0ee70c2c9c6ff08e502b6f0bba3e15f62 (patch) | |
| tree | 48e85cacbc4bea214cf2fb817793a8d176e4cb96 /drivers/clocksource | |
| parent | 254d8b5d59516d670111e0ac14d53fed4d61118d (diff) | |
| download | linux-cce483e0ee70c2c9c6ff08e502b6f0bba3e15f62.tar.bz2 | |
clocksource/drivers/h8300_timer8: Retrieve the clock rate at init time
The current code retrieves the rate value when the timer is enabled which
occurs each time a timer is re-armed. Except if the clock frequency has changed
magically I don't see why this should be done each time.
Retrieve the clock rate value at init time only.
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Diffstat (limited to 'drivers/clocksource')
| -rw-r--r-- | drivers/clocksource/h8300_timer8.c | 26 |
1 files changed, 14 insertions, 12 deletions
diff --git a/drivers/clocksource/h8300_timer8.c b/drivers/clocksource/h8300_timer8.c index 24d91b1a5d5c..187c41619b13 100644 --- a/drivers/clocksource/h8300_timer8.c +++ b/drivers/clocksource/h8300_timer8.c @@ -34,7 +34,6 @@ struct timer8_priv { unsigned long flags; unsigned int rate; unsigned int tcora; - struct clk *pclk; }; static unsigned long timer8_get_counter(struct timer8_priv *p) @@ -92,7 +91,6 @@ static void timer8_set_next(struct timer8_priv *p, unsigned long delta) static int timer8_enable(struct timer8_priv *p) { - p->rate = clk_get_rate(p->pclk) / SCALE; ctrl_outw(0xffff, p->mapbase + TCORA); ctrl_outw(0x0000, p->mapbase + _8TCNT); ctrl_outw(0x0c02, p->mapbase + _8TCR); @@ -102,16 +100,15 @@ static int timer8_enable(struct timer8_priv *p) static int timer8_start(struct timer8_priv *p) { - int ret = 0; + int ret; - if (!(p->flags & FLAG_STARTED)) - ret = timer8_enable(p); + if ((p->flags & FLAG_STARTED)) + return 0; - if (ret) - goto out; - p->flags |= FLAG_STARTED; + ret = timer8_enable(p); + if (!ret) + p->flags |= FLAG_STARTED; - out: return ret; } @@ -217,7 +214,12 @@ static void __init h8300_8timer_init(struct device_node *node) } timer8_priv.mapbase = (unsigned long)base; - timer8_priv.pclk = clk; + + rate = clk_get_rate(clk) / SCALE; + if (!rate) { + pr_err("Failed to get rate for the clocksource\n"); + goto unmap_reg; + } ret = request_irq(irq, timer8_interrupt, IRQF_TIMER, timer8_priv.ced.name, &timer8_priv); @@ -225,10 +227,10 @@ static void __init h8300_8timer_init(struct device_node *node) pr_err("failed to request irq %d for clockevent\n", irq); goto unmap_reg; } - rate = clk_get_rate(clk) / SCALE; + clockevents_config_and_register(&timer8_priv.ced, rate, 1, 0x0000ffff); - return; + return; unmap_reg: iounmap(base); free_clk: |