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pwm: fix min and max duty cycle

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PD#165774: pwm: fix min and max duty cycle

When the duty equal 0% and 100%, there is one high or low
count ,the constant bit should be enabled;and constant
bit should be disabled for other duty_cycle.

Change-Id: I36eefee3613f113f6c30db076e41cd8223086c54
Signed-off-by: Jian Hu <jian.hu@amlogic.com>
This commit is contained in:
Jian Hu
2018-05-09 13:50:29 +08:00
committed by Yixun Lan
parent 0520011c45
commit 9e832877f5
1 changed files with 12 additions and 2 deletions
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14
drivers/amlogic/pwm/pwm_meson.c
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@@ -204,12 +204,12 @@ static int meson_pwm_calc(struct meson_pwm *meson,
if (duty == period) {
channel->pre_div = pre_div;
channel->hi = cnt - 1;
channel->hi = cnt;
channel->lo = 0;
} else if (duty == 0) {
channel->pre_div = pre_div;
channel->hi = 0;
channel->lo = cnt - 1;
channel->lo = cnt;
} else {
/* Then check is we can have the duty with the same pre_div */
duty_cnt = DIV_ROUND_CLOSEST_ULL((u64)duty * 1000,
@@ -226,6 +226,16 @@ static int meson_pwm_calc(struct meson_pwm *meson,
channel->hi = duty_cnt - 1;
channel->lo = cnt - duty_cnt - 1;
}
/*
* duty_cycle equal 0% and 100%,constant should be enabled,
* high and low count will not incease one;
* otherwise, high and low count increase one.
*/
if (duty == period || duty == 0)
pwm_constant_enable(meson, id);
else
pwm_constant_disable(meson, id);
return 0;
}