[PATCH 06/16] pwm: lpss: Add debug prints, test patch for moving i915 to atomic PWM

[Hans de Goede]

Add debug prints, test patch for moving i915 to atomic PWM.

Signed-off-by: Hans de Goede <hdegoede at redhat.com>
---
 drivers/pwm/pwm-lpss.c | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/drivers/pwm/pwm-lpss.c b/drivers/pwm/pwm-lpss.c
index 2cb0e2a9c08c..c1f8e6da0cd7 100644
--- a/drivers/pwm/pwm-lpss.c
+++ b/drivers/pwm/pwm-lpss.c
@@ -119,6 +119,8 @@ static void pwm_lpss_prepare(struct pwm_lpss_chip *lpwm, struct pwm_device *pwm,
 		ctrl |= PWM_ENABLE;
 
 	if (orig_ctrl != ctrl) {
+		dev_err(pwm->chip->dev, "prepare 0x%08x -> 0x%08lx\n",
+			orig_ctrl, ctrl | PWM_SW_UPDATE);
 		pwm_lpss_write(pwm, ctrl);
 		pwm_lpss_write(pwm, ctrl | PWM_SW_UPDATE);
 	}
@@ -126,8 +128,15 @@ static void pwm_lpss_prepare(struct pwm_lpss_chip *lpwm, struct pwm_device *pwm,
 
 static inline void pwm_lpss_cond_enable(struct pwm_device *pwm, bool cond)
 {
-	if (cond)
-		pwm_lpss_write(pwm, pwm_lpss_read(pwm) | PWM_ENABLE);
+	if (cond) {
+		u32 orig_ctrl, ctrl;
+
+		orig_ctrl = ctrl = pwm_lpss_read(pwm);
+		ctrl |= PWM_ENABLE;
+		dev_err(pwm->chip->dev, "enable 0x%08x -> 0x%08x\n",
+			orig_ctrl, ctrl);
+		pwm_lpss_write(pwm, ctrl);
+	}
 }
 
 static int pwm_lpss_apply(struct pwm_chip *chip, struct pwm_device *pwm,
@@ -200,6 +209,9 @@ static void pwm_lpss_get_state(struct pwm_chip *chip, struct pwm_device *pwm,
 	state->enabled = !!(ctrl & PWM_ENABLE);
 
 	pm_runtime_put(chip->dev);
+
+	dev_err(pwm->chip->dev, "initial state 0x%08x period %d duty_cycle %d enabled %d\n",
+		ctrl, state->period, state->duty_cycle, state->enabled);
 }
 
 static const struct pwm_ops pwm_lpss_ops = {
-- 
2.26.2