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authorLokesh Vutla <lokeshvutla@ti.com>2020-03-12 09:52:08 +0530
committerThierry Reding <thierry.reding@gmail.com>2020-03-30 18:03:07 +0200
commit867beb60d131f7a5cde88ba375338285fdc6ddb8 (patch)
tree4d4f2a8f396989c859611fe915829a1f25e5bb49 /drivers/pwm
parent348fb6f7fb4cc7ebc35d1cde6e5c2ada64b683c6 (diff)
downloadlinux-867beb60d131f7a5cde88ba375338285fdc6ddb8.tar.bz2
pwm: omap-dmtimer: Fix PWM enabling sequence
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>
Diffstat (limited to 'drivers/pwm')
-rw-r--r--drivers/pwm/pwm-omap-dmtimer.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/drivers/pwm/pwm-omap-dmtimer.c b/drivers/pwm/pwm-omap-dmtimer.c
index 92aac6c86b95..85b17b49980b 100644
--- a/drivers/pwm/pwm-omap-dmtimer.c
+++ b/drivers/pwm/pwm-omap-dmtimer.c
@@ -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);