clocksource: sh_tmu: compute mult and shift before registration
Since commit 98962465ed
("nohz: Prevent
clocksource wrapping during idle"), the CPU of an R2D board never goes
to idle. This commit assumes that mult and shift are assigned before
the clocksource is registered. As a consequence the safe maximum sleep
time is negative and the CPU never goes into idle.
This patch fixes the problem by moving mult and shift initialization
from sh_tmu_clocksource_enable() to sh_tmu_register_clocksource().
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Cc: stable@kernel.org
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Родитель
019e2574f9
Коммит
66f49121ff
|
@ -199,16 +199,8 @@ static cycle_t sh_tmu_clocksource_read(struct clocksource *cs)
|
|||
static int sh_tmu_clocksource_enable(struct clocksource *cs)
|
||||
{
|
||||
struct sh_tmu_priv *p = cs_to_sh_tmu(cs);
|
||||
int ret;
|
||||
|
||||
ret = sh_tmu_enable(p);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
/* TODO: calculate good shift from rate and counter bit width */
|
||||
cs->shift = 10;
|
||||
cs->mult = clocksource_hz2mult(p->rate, cs->shift);
|
||||
return 0;
|
||||
return sh_tmu_enable(p);
|
||||
}
|
||||
|
||||
static void sh_tmu_clocksource_disable(struct clocksource *cs)
|
||||
|
@ -228,6 +220,16 @@ static int sh_tmu_register_clocksource(struct sh_tmu_priv *p,
|
|||
cs->disable = sh_tmu_clocksource_disable;
|
||||
cs->mask = CLOCKSOURCE_MASK(32);
|
||||
cs->flags = CLOCK_SOURCE_IS_CONTINUOUS;
|
||||
|
||||
/* clk_get_rate() needs an enabled clock */
|
||||
clk_enable(p->clk);
|
||||
/* channel will be configured at parent clock / 4 */
|
||||
p->rate = clk_get_rate(p->clk) / 4;
|
||||
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;
|
||||
|
|
Загрузка…
Ссылка в новой задаче