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authorDaniel Lezcano <daniel.lezcano@linaro.org>2015-11-09 01:24:28 +0300
committerDaniel Lezcano <daniel.lezcano@linaro.org>2015-12-15 11:42:20 +0300
commitcce483e0ee70c2c9c6ff08e502b6f0bba3e15f62 (patch)
tree48e85cacbc4bea214cf2fb817793a8d176e4cb96 /drivers/clocksource/h8300_timer8.c
parent254d8b5d59516d670111e0ac14d53fed4d61118d (diff)
downloadlinux-cce483e0ee70c2c9c6ff08e502b6f0bba3e15f62.tar.xz
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/h8300_timer8.c')
-rw-r--r--drivers/clocksource/h8300_timer8.c26
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: