linux-kernel - [PATCH v3] backlight: lp855x: Switch to atomic PWM API

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Date:   Sat, 30 Oct 2021 10:35:05 -0300
From:   Maíra Canal <maira.canal@....br>
To:     lee.jones@...aro.org, daniel.thompson@...aro.org,
        jingoohan1@...il.com, thierry.reding@...il.com,
        u.kleine-koenig@...gutronix.de
Cc:     dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-pwm@...r.kernel.org
Subject: [PATCH v3] backlight: lp855x: Switch to atomic PWM API

Remove legacy PWM interface (pwm_config, pwm_enable, pwm_disable) and
replace it for the atomic PWM API.

Signed-off-by: Maíra Canal <maira.canal@....br>
---
V1 -> V2: Initialize variable and simply conditional loop
V2 -> V3: Fix assignment of NULL variable
---
 drivers/video/backlight/lp855x_bl.c | 23 ++++++++++-------------
 1 file changed, 10 insertions(+), 13 deletions(-)

diff --git a/drivers/video/backlight/lp855x_bl.c b/drivers/video/backlight/lp855x_bl.c
index e94932c69f54..627a31d05691 100644
--- a/drivers/video/backlight/lp855x_bl.c
+++ b/drivers/video/backlight/lp855x_bl.c
@@ -233,9 +233,8 @@ static int lp855x_configure(struct lp855x *lp)
 
 static void lp855x_pwm_ctrl(struct lp855x *lp, int br, int max_br)
 {
-	unsigned int period = lp->pdata->period_ns;
-	unsigned int duty = br * period / max_br;
-	struct pwm_device *pwm;
+	struct pwm_device *pwm = NULL;
+	struct pwm_state state;
 
 	/* request pwm device with the consumer name */
 	if (!lp->pwm) {
@@ -245,18 +244,16 @@ static void lp855x_pwm_ctrl(struct lp855x *lp, int br, int max_br)
 
 		lp->pwm = pwm;
 
-		/*
-		 * FIXME: pwm_apply_args() should be removed when switching to
-		 * the atomic PWM API.
-		 */
-		pwm_apply_args(pwm);
+		pwm_init_state(lp->pwm, &state);
+		state.period = lp->pdata->period_ns;
 	}
 
-	pwm_config(lp->pwm, duty, period);
-	if (duty)
-		pwm_enable(lp->pwm);
-	else
-		pwm_disable(lp->pwm);
+	pwm_get_state(lp->pwm, &state);
+
+	state.duty_cycle = br * state.period / max_br;
+	state.enabled = state.duty_cycle;
+
+	pwm_apply_state(lp->pwm, &state);
 }
 
 static int lp855x_bl_update_status(struct backlight_device *bl)
-- 
2.31.1