On Mon, Nov 12, 2018 at 10:02:57AM +0100, Heiko Stuebner wrote:
> From: Heiko Stuebner <heiko.stuebner@xxxxxx>
>
> Commit 88ba95bedb79 ("backlight: pwm_bl: Compute brightness of LED linearly
> to human eye") made the parse-dt function return early when using an auto-
> generated brightness-table, but didn't take into account that some more
> settings were handled below the brightness handling, like power-on-delays
> and also setting the pdata enable-gpio to -EINVAL.
>
> This surfaces for example in the case of a backlight without any
> enable-gpio which then tries to use gpio-0 in error.
>
> Fix this by simply moving the trailing settings above the brightness
> handling.
>
> Fixes: 88ba95bedb79 ("backlight: pwm_bl: Compute brightness of LED linearly to human eye")
> Signed-off-by: Heiko Stuebner <heiko.stuebner@xxxxxx>
Acked-by: Daniel Thompson <daniel.thompson@xxxxxxxxxx>
> ---
> drivers/video/backlight/pwm_bl.c | 19 ++++++++++---------
> 1 file changed, 10 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c
> index bcd08b41765d..b7b5b31f3824 100644
> --- a/drivers/video/backlight/pwm_bl.c
> +++ b/drivers/video/backlight/pwm_bl.c
> @@ -272,6 +272,16 @@ static int pwm_backlight_parse_dt(struct device *dev,
>
> memset(data, 0, sizeof(*data));
>
> + /*
> + * These values are optional and set as 0 by default, the out values
> + * are modified only if a valid u32 value can be decoded.
> + */
> + of_property_read_u32(node, "post-pwm-on-delay-ms",
> + &data->post_pwm_on_delay);
> + of_property_read_u32(node, "pwm-off-delay-ms", &data->pwm_off_delay);
> +
> + data->enable_gpio = -EINVAL;
> +
> /*
> * Determine the number of brightness levels, if this property is not
> * set a default table of brightness levels will be used.
> @@ -384,15 +394,6 @@ static int pwm_backlight_parse_dt(struct device *dev,
> data->max_brightness--;
> }
>
> - /*
> - * These values are optional and set as 0 by default, the out values
> - * are modified only if a valid u32 value can be decoded.
> - */
> - of_property_read_u32(node, "post-pwm-on-delay-ms",
> - &data->post_pwm_on_delay);
> - of_property_read_u32(node, "pwm-off-delay-ms", &data->pwm_off_delay);
> -
> - data->enable_gpio = -EINVAL;
> return 0;
> }
>
> --
> 2.18.0
>
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