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pwm: omap-dmtimer: Fix PWM enabling sequence

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To configure DM timer in PWM mode the following needs to be set in
OMAP_TIMER_CTRL_REG using set_pwm callback:
- Set toggle mode on PORTIMERPWM output pin
- Set trigger on overflow and match on PORTIMERPWM output pin.
- Set auto reload

This is a one time configuration and needs to be set before the start of
the DM timer. But the current driver tries to set the same configuration
for every period/duty cycle update, which is not needed. So move the PWM
setup before enabling timer and do not update it in
pwm_omap_dmtimer_config().

Tested-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
This commit is contained in:
Lokesh Vutla 2020-03-12 09:52:08 +05:30 committed by Thierry Reding
parent 348fb6f7fb
commit 867beb60d1
1 changed files with 5 additions and 5 deletions
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10
drivers/pwm/pwm-omap-dmtimer.c
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@ -81,6 +81,11 @@ static int pwm_omap_dmtimer_enable(struct pwm_chip *chip,
struct pwm_omap_dmtimer_chip *omap = to_pwm_omap_dmtimer_chip(chip);
mutex_lock(&omap->mutex);
omap->pdata->set_pwm(omap->dm_timer,
pwm_get_polarity(pwm) == PWM_POLARITY_INVERSED,
true, OMAP_TIMER_TRIGGER_OVERFLOW_AND_COMPARE,
true);
pwm_omap_dmtimer_start(omap);
mutex_unlock(&omap->mutex);
@ -197,11 +202,6 @@ static int pwm_omap_dmtimer_config(struct pwm_chip *chip,
dev_dbg(chip->dev, "load value: %#08x (%d), match value: %#08x (%d)\n",
load_value, load_value, match_value, match_value);
omap->pdata->set_pwm(omap->dm_timer,
pwm_get_polarity(pwm) == PWM_POLARITY_INVERSED,
true, OMAP_TIMER_TRIGGER_OVERFLOW_AND_COMPARE,
true);
/* If config was called while timer was running it must be reenabled. */
if (timer_active)
pwm_omap_dmtimer_start(omap);