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SubjectRe: [PATCH 3/4] backlight: pwm_bl: Set scale type for CIE 1931 curves
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Hi Matthias,

On 13/6/19 21:43, Matthias Kaehlcke wrote:
> For backlight curves calculated with the CIE 1931 algorithm set
> the brightness scale type property accordingly. This makes the
> scale type available to userspace via the 'scale' sysfs attribute.
>
> Signed-off-by: Matthias Kaehlcke <mka@chromium.org>

Tested on Samsung Chromebook Plus which uses the CIE 1931 algorithm.

Tested-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>

> ---
> drivers/video/backlight/pwm_bl.c | 5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c
> index fb45f866b923..f067fe7aa35d 100644
> --- a/drivers/video/backlight/pwm_bl.c
> +++ b/drivers/video/backlight/pwm_bl.c
> @@ -553,6 +553,8 @@ 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
> @@ -591,6 +593,8 @@ static int pwm_backlight_probe(struct platform_device *pdev)
>
> pb->levels = data->levels;
> }
> +
> + props.scale = BACKLIGHT_SCALE_CIE1931;
> } else {
> /*
> * That only happens for the non-DT case, where platform data
> @@ -601,7 +605,6 @@ 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,
>

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