diff options
Diffstat (limited to 'drivers/pwm')
| -rw-r--r-- | drivers/pwm/pwm-meson.c | 16 |
1 files changed, 10 insertions, 6 deletions
diff --git a/drivers/pwm/pwm-meson.c b/drivers/pwm/pwm-meson.c index defc27d..cb845ed 100644 --- a/drivers/pwm/pwm-meson.c +++ b/drivers/pwm/pwm-meson.c @@ -163,7 +163,8 @@ static int meson_pwm_calc(struct meson_pwm *meson, unsigned int duty, unsigned int period) { unsigned int pre_div, cnt, duty_cnt; - unsigned long fin_freq = -1, fin_ns; + unsigned long fin_freq = -1; + u64 fin_ps; if (~(meson->inverter_mask >> id) & 0x1) duty = period - duty; @@ -179,13 +180,15 @@ static int meson_pwm_calc(struct meson_pwm *meson, } dev_dbg(meson->chip.dev, "fin_freq: %lu Hz\n", fin_freq); - fin_ns = NSEC_PER_SEC / fin_freq; + fin_ps = (u64)NSEC_PER_SEC * 1000; + do_div(fin_ps, fin_freq); /* Calc pre_div with the period */ for (pre_div = 0; pre_div < MISC_CLK_DIV_MASK; pre_div++) { - cnt = DIV_ROUND_CLOSEST(period, fin_ns * (pre_div + 1)); - dev_dbg(meson->chip.dev, "fin_ns=%lu pre_div=%u cnt=%u\n", - fin_ns, pre_div, cnt); + cnt = DIV_ROUND_CLOSEST_ULL((u64)period * 1000, + fin_ps * (pre_div + 1)); + dev_dbg(meson->chip.dev, "fin_ps=%llu pre_div=%u cnt=%u\n", + fin_ps, pre_div, cnt); if (cnt <= 0xffff) break; } @@ -208,7 +211,8 @@ static int meson_pwm_calc(struct meson_pwm *meson, channel->lo = cnt; } else { /* Then check is we can have the duty with the same pre_div */ - duty_cnt = DIV_ROUND_CLOSEST(duty, fin_ns * (pre_div + 1)); + duty_cnt = DIV_ROUND_CLOSEST_ULL((u64)duty * 1000, + fin_ps * (pre_div + 1)); if (duty_cnt > 0xffff) { dev_err(meson->chip.dev, "unable to get duty cycle\n"); return -EINVAL; |
