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exynos: pwm: Deal with a PWM at 100%

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At present the counter never hits the comparitor in this case. Add a
special case.

This ensures that the snow backlight works when at full brightness.

Fixes: 76c2ff3e5f video: backlight: fix pwm's duty cycle calculation

Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
This commit is contained in:
Simon Glass 2021-11-03 13:21:33 -06:00 committed by Minkyu Kang
parent f8ed905900
commit dfb8470fd0
1 changed files with 4 additions and 0 deletions
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4
drivers/pwm/exynos_pwm.c
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@ -43,6 +43,10 @@ static int exynos_pwm_set_config(struct udevice *dev, uint channel,
tcnt = period_ns / rate_ns;
tcmp = duty_ns / rate_ns;
debug("%s: tcnt %u, tcmp %u\n", __func__, tcnt, tcmp);
/* Ensure that the comparitor will actually hit the target */
if (tcmp == tcnt)
tcmp = tcnt - 1;
offset = channel * 3;
writel(tcnt, &regs->tcntb0 + offset);
writel(tcmp, &regs->tcmpb0 + offset);