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pwm: omap-dmtimer: Add debug message for effective period and duty cycle

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After going through the math and constraints checking to compute load
and match values, it is helpful to know what the resultant period and
duty cycle are.

Signed-off-by: David Rivshin <drivshin@allworx.com>
Acked-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
This commit is contained in:
David Rivshin 2016-01-29 23:26:54 -05:00 committed by Thierry Reding
parent 7b0883f338
commit 922201d129
1 changed files with 8 additions and 1 deletions
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9
drivers/pwm/pwm-omap-dmtimer.c
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@ -102,7 +102,8 @@ static int pwm_omap_dmtimer_config(struct pwm_chip *chip,
unsigned long clk_rate;
bool timer_active;
dev_dbg(chip->dev, "duty cycle: %d, period %d\n", duty_ns, period_ns);
dev_dbg(chip->dev, "requested duty cycle: %d ns, period: %d ns\n",
duty_ns, period_ns);
mutex_lock(&omap->mutex);
if (duty_ns == pwm_get_duty_cycle(pwm) &&
@ -166,6 +167,12 @@ static int pwm_omap_dmtimer_config(struct pwm_chip *chip,
duty_cycles = period_cycles - 1;
}
dev_dbg(chip->dev, "effective duty cycle: %lld ns, period: %lld ns\n",
DIV_ROUND_CLOSEST_ULL((u64)NSEC_PER_SEC * duty_cycles,
clk_rate),
DIV_ROUND_CLOSEST_ULL((u64)NSEC_PER_SEC * period_cycles,
clk_rate));
load_value = (DM_TIMER_MAX - period_cycles) + 1;
match_value = load_value + duty_cycles - 1;