# Re: \[PATCH v2\] backlight: pwm\_bl: Fix brightness levels for non-DT case.

- From: Uwe Kleine-König \<hidden\>
- Date: 2018-11-06 20:53:18 
- List: linux-fbdev
- Page: https://ratatoskr.run/linux-fbdev/2018/11/5425490
- Thread: https://ratatoskr.run/stable/2018/10/5418948/t.md

```text
On Tue, Oct 30, 2018 at 11:34:41AM +0100, Enric Balletbo i Serra wrote:
> Commit '88ba95bedb79 ("backlight: pwm_bl: Compute brightness of LED
> linearly to human eye")' allows the possibility to compute a default
> brightness table when there isn't the brightness-levels property in the
> DT. Unfortunately the changes made broke the pwm backlight for the
> non-DT boards.
> 
> Usually, the non-DT boards don't pass the brightness levels via platform
> data, instead, it sets the max_brightness in their platform data and the
> driver calculates the level without a table. The ofending patch assumed

s/ofending/offending/

> hat when there is no brightness levels table we should create one, but this

s/hat/that/

> is clearly wrong for the non-DT case.
> 
> After this patch the code handles the DT and the non-DT case taking in
> consideration also if max_brightness is set or not.
> 
> Fixes: '88ba95bedb79 ("backlight: pwm_bl: Compute brightness of LED linearly to human eye")'

These ' are unusual.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
```