Merge tag 'pwm/for-5.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm

Pull pwm updates from Thierry Reding:
 "This set is mostly small fixes and cleanups, so more of a janitorial
  update for this cycle"

* tag 'pwm/for-5.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm:
  pwm: vt8500: Rename pwm_busy_wait() to make it obviously driver-specific
  dt-bindings: pwm: tpu: Add R-Car M3-W+ device tree bindings
  dt-bindings: pwm: tpu: Add R-Car V3U device tree bindings
  pwm: pwm-samsung: Trigger manual update when disabling PWM
  pwm: visconti: Simplify using devm_pwmchip_add()
  pwm: samsung: Describe driver in Kconfig
  pwm: Make it explicit that pwm_apply_state() might sleep
  pwm: Add might_sleep() annotations for !CONFIG_PWM API functions
  pwm: atmel: Drop unused header

1 files changed, 22 insertions, 8 deletions

diff --git a/drivers/pwm/pwm-samsung.c b/drivers/pwm/pwm-samsung.c
index dd94c4312a0c..0a4ff55fad04 100644
--- a/drivers/pwm/pwm-samsung.c
+++ b/drivers/pwm/pwm-samsung.c
@@ -117,6 +117,20 @@ static inline unsigned int to_tcon_channel(unsigned int channel)
 	return (channel == 0) ? 0 : (channel + 1);
 }
 
+static void __pwm_samsung_manual_update(struct samsung_pwm_chip *chip,
+				      struct pwm_device *pwm)
+{
+	unsigned int tcon_chan = to_tcon_channel(pwm->hwpwm);
+	u32 tcon;
+
+	tcon = readl(chip->base + REG_TCON);
+	tcon |= TCON_MANUALUPDATE(tcon_chan);
+	writel(tcon, chip->base + REG_TCON);
+
+	tcon &= ~TCON_MANUALUPDATE(tcon_chan);
+	writel(tcon, chip->base + REG_TCON);
+}
+
 static void pwm_samsung_set_divisor(struct samsung_pwm_chip *pwm,
 				    unsigned int channel, u8 divisor)
 {
@@ -276,6 +290,13 @@ static void pwm_samsung_disable(struct pwm_chip *chip, struct pwm_device *pwm)
 	tcon &= ~TCON_AUTORELOAD(tcon_chan);
 	writel(tcon, our_chip->base + REG_TCON);
 
+	/*
+	 * In case the PWM is at 100% duty cycle, force a manual
+	 * update to prevent the signal from staying high.
+	 */
+	if (readl(our_chip->base + REG_TCMPB(pwm->hwpwm)) == (u32)-1U)
+		__pwm_samsung_manual_update(our_chip, pwm);
+
 	our_chip->disabled_mask |= BIT(pwm->hwpwm);
 
 	spin_unlock_irqrestore(&samsung_pwm_lock, flags);
@@ -284,18 +305,11 @@ static void pwm_samsung_disable(struct pwm_chip *chip, struct pwm_device *pwm)
 static void pwm_samsung_manual_update(struct samsung_pwm_chip *chip,
 				      struct pwm_device *pwm)
 {
-	unsigned int tcon_chan = to_tcon_channel(pwm->hwpwm);
-	u32 tcon;
 	unsigned long flags;
 
 	spin_lock_irqsave(&samsung_pwm_lock, flags);
 
-	tcon = readl(chip->base + REG_TCON);
-	tcon |= TCON_MANUALUPDATE(tcon_chan);
-	writel(tcon, chip->base + REG_TCON);
-
-	tcon &= ~TCON_MANUALUPDATE(tcon_chan);
-	writel(tcon, chip->base + REG_TCON);
+	__pwm_samsung_manual_update(chip, pwm);
 
 	spin_unlock_irqrestore(&samsung_pwm_lock, flags);
 }