clocksource: sh_cmt: compute mult and shift before registration

commit f4d7c3565c1692c54d9152b52090fe73f0029e37 upstream.

Based on the sh_tmu change in 66f49121ffa41a19c59965b31b046d8368fec3c7
("clocksource: sh_tmu: compute mult and shift before registration").
The same issues impact the sh_cmt driver, so we take the same approach
here.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/clocksource/sh_cmt.c b/drivers/clocksource/sh_cmt.c
index 6fe4f7701188c87423fb3fb85987f76cd95a5f41..234d9f6bc69692b7d987500a9fd5de4d99772912 100644 (file)
--- a/drivers/clocksource/sh_cmt.c
+++ b/drivers/clocksource/sh_cmt.c
@@ -413,18 +413,10 @@ static cycle_t sh_cmt_clocksource_read(struct clocksource *cs)
 static int sh_cmt_clocksource_enable(struct clocksource *cs)
 {
        struct sh_cmt_priv *p = cs_to_sh_cmt(cs);
-       int ret;
 
        p->total_cycles = 0;
 
-       ret = sh_cmt_start(p, FLAG_CLOCKSOURCE);
-       if (ret)
-               return ret;
-
-       /* TODO: calculate good shift from rate and counter bit width */
-       cs->shift = 0;
-       cs->mult = clocksource_hz2mult(p->rate, cs->shift);
-       return 0;
+       return sh_cmt_start(p, FLAG_CLOCKSOURCE);
 }
 
 static void sh_cmt_clocksource_disable(struct clocksource *cs)
@@ -444,7 +436,18 @@ static int sh_cmt_register_clocksource(struct sh_cmt_priv *p,
        cs->disable = sh_cmt_clocksource_disable;
        cs->mask = CLOCKSOURCE_MASK(sizeof(unsigned long) * 8);
        cs->flags = CLOCK_SOURCE_IS_CONTINUOUS;
+
+       /* clk_get_rate() needs an enabled clock */
+       clk_enable(p->clk);
+       p->rate = clk_get_rate(p->clk) / (p->width == 16) ? 512 : 8;
+       clk_disable(p->clk);
+
+       /* TODO: calculate good shift from rate and counter bit width */
+       cs->shift = 10;
+       cs->mult = clocksource_hz2mult(p->rate, cs->shift);
+
        pr_info("sh_cmt: %s used as clock source\n", cs->name);
+
        clocksource_register(cs);
        return 0;
 }