linux-kernel - [PATCH v3 4/9] regulator: rpi-panel: Ensure the backlight is off during probe.

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Message-Id: <20220124220129.158891-5-detlev.casanova@collabora.com>
Date:   Mon, 24 Jan 2022 17:01:24 -0500
From:   Detlev Casanova <detlev.casanova@...labora.com>
To:     linux-kernel@...r.kernel.org
Cc:     Dave Stevenson <dave.stevenson@...pberrypi.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Detlev Casanova <detlev.casanova@...labora.com>
Subject: [PATCH v3 4/9] regulator: rpi-panel: Ensure the backlight is off during probe.

From: Dave Stevenson <dave.stevenson@...pberrypi.com>

The initial state of the Atmel is not defined, so ensure the
backlight PWM is set to 0 by default.

Signed-off-by: Dave Stevenson <dave.stevenson@...pberrypi.com>
Signed-off-by: Detlev Casanova <detlev.casanova@...labora.com>
---
 drivers/regulator/rpi-panel-attiny-regulator.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/regulator/rpi-panel-attiny-regulator.c b/drivers/regulator/rpi-panel-attiny-regulator.c
index a4af7adad2b5..b3629a1e0e50 100644
--- a/drivers/regulator/rpi-panel-attiny-regulator.c
+++ b/drivers/regulator/rpi-panel-attiny-regulator.c
@@ -250,6 +250,7 @@ static int attiny_i2c_probe(struct i2c_client *i2c,
 
 	regmap_write(regmap, REG_POWERON, 0);
 	msleep(30);
+	regmap_write(regmap, REG_PWM, 0);
 
 	config.dev = &i2c->dev;
 	config.regmap = regmap;
-- 
2.34.1