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authorPaul Mundt <lethal@linux-sh.org>2010-06-02 17:10:44 +0900
committerPaul Mundt <lethal@linux-sh.org>2010-06-02 17:10:44 +0900
commitf4d7c3565c1692c54d9152b52090fe73f0029e37 (patch)
tree1bda3fdcdd3b706542f9464aed84d346fa5fab25 /drivers/clocksource
parent66f49121ffa41a19c59965b31b046d8368fec3c7 (diff)
downloadlinux-f4d7c3565c1692c54d9152b52090fe73f0029e37.tar.bz2
clocksource: sh_cmt: compute mult and shift before registration
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. Cc: stable@kernel.org Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'drivers/clocksource')
-rw-r--r--drivers/clocksource/sh_cmt.c22
1 files changed, 13 insertions, 9 deletions
diff --git a/drivers/clocksource/sh_cmt.c b/drivers/clocksource/sh_cmt.c
index f6677cb19789..f3d3898898ed 100644
--- a/drivers/clocksource/sh_cmt.c
+++ b/drivers/clocksource/sh_cmt.c
@@ -412,18 +412,10 @@ 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)
@@ -450,8 +442,20 @@ static int sh_cmt_register_clocksource(struct sh_cmt_priv *p,
cs->resume = sh_cmt_clocksource_resume;
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);
+
dev_info(&p->pdev->dev, "used as clock source\n");
+
clocksource_register(cs);
+
return 0;
}