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Code Issues Releases Wiki Activity

backlight: ktd253: Bring up in a known state

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The KTD253 backlight might already be on when the driver
is probed: then we don't really know what the current
ratio is and all light intensity settings will be off
relative to what it was at boot.

To fix this, bring up the backlight OFF then move it to
the default backlight from there so we know the state.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Linus Walleij 2021-01-26 22:32:00 +01:00 committed by Lee Jones
parent 4a98e5ef88
commit 57e0d7b7f8
1 changed files with 3 additions and 9 deletions
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12
drivers/video/backlight/ktd253-backlight.c
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@ -137,15 +137,7 @@ static int ktd253_backlight_probe(struct platform_device *pdev)
brightness = max_brightness;
}
if (brightness)
/* This will be the default ratio when the KTD253 is enabled */
ktd253->ratio = KTD253_MAX_RATIO;
else
ktd253->ratio = 0;
ktd253->gpiod = devm_gpiod_get(dev, "enable",
brightness ? GPIOD_OUT_HIGH :
GPIOD_OUT_LOW);
ktd253->gpiod = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW);
if (IS_ERR(ktd253->gpiod)) {
ret = PTR_ERR(ktd253->gpiod);
if (ret != -EPROBE_DEFER)
@ -153,6 +145,8 @@ static int ktd253_backlight_probe(struct platform_device *pdev)
return ret;
}
gpiod_set_consumer_name(ktd253->gpiod, dev_name(dev));
/* Bring backlight to a known off state */
msleep(KTD253_T_OFF_MS);
bl = devm_backlight_device_register(dev, dev_name(dev), dev, ktd253,
&ktd253_backlight_ops, NULL);