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authorMatthias Kaehlcke <mka@chromium.org>2019-07-09 22:00:06 +0300
committerLee Jones <lee.jones@linaro.org>2019-09-02 17:55:11 +0300
commit511a204638d7d750f859c332635d09f38273b4f0 (patch)
tree8b7006b351fe99a23df34284317da4ea3553d4fc /drivers/video
parentd55c028f8b25bdaaba9ae08026052b5b44d031b0 (diff)
downloadlinux-511a204638d7d750f859c332635d09f38273b4f0.tar.xz
backlight: pwm_bl: Set scale type for CIE 1931 curves
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>
Diffstat (limited to 'drivers/video')
-rw-r--r--drivers/video/backlight/pwm_bl.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c
index 2201b8c78641..d6d2b6407d7e 100644
--- a/drivers/video/backlight/pwm_bl.c
+++ b/drivers/video/backlight/pwm_bl.c
@@ -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,