From: Matthias Kaehlcke Date: Tue, 9 Jul 2019 19:00:06 +0000 (-0700) Subject: backlight: pwm_bl: Set scale type for CIE 1931 curves X-Git-Tag: v5.4-rc1~62^2~1 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=511a204638d7d750f859c332635d09f38273b4f0;p=thirdparty%2Flinux.git 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 Tested-by: Enric Balletbo i Serra Acked-by: Daniel Thompson Signed-off-by: Lee Jones --- diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c index 2201b8c786419..d6d2b6407d7e1 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,