gpio: mvebu: make pwm .get_state closer to idempotent

Round up the divisions in .get_state() to make applying the read out
configuration idempotent in most cases as .apply rounds down.

Reported-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Reviewed-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>

diff --git a/drivers/gpio/gpio-mvebu.c b/drivers/gpio/gpio-mvebu.c
index c424d88..8673ba7 100644 (file)
--- a/drivers/gpio/gpio-mvebu.c
+++ b/drivers/gpio/gpio-mvebu.c
@@ -668,7 +668,7 @@ static void mvebu_pwm_get_state(struct pwm_chip *chip,
 
        regmap_read(mvpwm->regs, mvebu_pwmreg_blink_on_duration(mvpwm), &u);
        val = (unsigned long long) u * NSEC_PER_SEC;
-       do_div(val, mvpwm->clk_rate);
+       val = DIV_ROUND_UP_ULL(val, mvpwm->clk_rate);
        if (val > UINT_MAX)
                state->duty_cycle = UINT_MAX;
        else if (val)
@@ -680,7 +680,7 @@ static void mvebu_pwm_get_state(struct pwm_chip *chip,
        regmap_read(mvpwm->regs, mvebu_pwmreg_blink_off_duration(mvpwm), &u);
        val += (unsigned long long) u; /* period = on + off duration */
        val *= NSEC_PER_SEC;
-       do_div(val, mvpwm->clk_rate);
+       val = DIV_ROUND_UP_ULL(val, mvpwm->clk_rate);
        if (val > UINT_MAX)
                state->period = UINT_MAX;
        else if (val)