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backlight: pwm_bl: Set scale type for CIE 1931 curves

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For backlight curves calculated with the CIE 1931 algorithm set
the brightness scale type to non-linear. This makes the scale type
available to userspace via the 'scale' sysfs attribute.

Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Tested-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Acked-by: Daniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Matthias Kaehlcke 2019-07-09 12:00:06 -07:00 committed by Lee Jones
parent d55c028f8b
commit 511a204638
1 changed files with 4 additions and 1 deletions
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5
drivers/video/backlight/pwm_bl.c
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@ -536,6 +536,8 @@ static int pwm_backlight_probe(struct platform_device *pdev)
goto err_alloc;
}
memset(&props, 0, sizeof(struct backlight_properties));
if (data->levels) {
/*
* For the DT case, only when brightness levels is defined
@ -574,6 +576,8 @@ static int pwm_backlight_probe(struct platform_device *pdev)
pb->levels = data->levels;
}
props.scale = BACKLIGHT_SCALE_NON_LINEAR;
} else {
/*
* That only happens for the non-DT case, where platform data
@ -584,7 +588,6 @@ static int pwm_backlight_probe(struct platform_device *pdev)
pb->lth_brightness = data->lth_brightness * (state.period / pb->scale);
memset(&props, 0, sizeof(struct backlight_properties));
props.type = BACKLIGHT_RAW;
props.max_brightness = data->max_brightness;
bl = backlight_device_register(dev_name(&pdev->dev), &pdev->dev, pb,