[PATCH AUTOSEL 4.9 138/251] pwm: meson: Don't disable PWM when setting duty repeatedly
From: Sasha Levin <sashal@kernel.org>
Date: 2020-01-16 17:39:54
Also in:
linux-amlogic, linux-pwm, lkml, stable
Subsystem:
pwm subsystem, the rest · Maintainers:
Uwe Kleine-König, Linus Torvalds
From: Bichao Zheng <redacted>
[ Upstream commit a279345807e1e0ae79567a52cfdd9d30c9174a3c ]
There is an abnormally low about 20ms,when setting duty repeatedly.
Because setting the duty will disable PWM and then enable. Delete
this operation now.
Fixes: 211ed630753d2f ("pwm: Add support for Meson PWM Controller")
Signed-off-by: Bichao Zheng <redacted>
[ Dropped code instead of hiding it behind a comment ]
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Reviewed-by: Neil Armstrong <redacted>
Signed-off-by: Thierry Reding <redacted>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/pwm/pwm-meson.c | 5 -----
1 file changed, 5 deletions(-)
diff --git a/drivers/pwm/pwm-meson.c b/drivers/pwm/pwm-meson.c
index f58a4867b519..a196439ee14c 100644
--- a/drivers/pwm/pwm-meson.c
+++ b/drivers/pwm/pwm-meson.c@@ -320,11 +320,6 @@ static int meson_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, if (state->period != channel->state.period || state->duty_cycle != channel->state.duty_cycle || state->polarity != channel->state.polarity) { - if (channel->state.enabled) { - meson_pwm_disable(meson, pwm->hwpwm); - channel->state.enabled = false; - } - if (state->polarity != channel->state.polarity) { if (state->polarity == PWM_POLARITY_NORMAL) meson->inverter_mask |= BIT(pwm->hwpwm);
--
2.20.1
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