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Commit 922201d1 authored by David Rivshin's avatar David Rivshin Committed by Thierry Reding
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pwm: omap-dmtimer: Add debug message for effective period and duty cycle 



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: default avatarDavid Rivshin <drivshin@allworx.com>
Acked-by: default avatarNeil Armstrong <narmstrong@baylibre.com>
Signed-off-by: default avatarThierry Reding <thierry.reding@gmail.com>
parent 7b0883f3

drivers/pwm/pwm-omap-dmtimer.c

+8 −1
Original line number Diff line number Diff line
@@ -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;