Re: [PATCH 0/2] pwm: mtk-disp: Fix backlight configuration at boot

[Adrian Ratiu]

On Mon, 23 Jan 2023, AngeloGioacchino Del Regno 
<angelogioacchino.delregno@xxxxxxxxxxxxx> wrote:
> Since the pwm-mtk-disp driver was fixed to get PWM_EN state from 
> the right register, an old two-wrongs-make-one-right issue 
> emerged: as a result, MT8192 Asurada Spherion got no backlight 
> at boot unless a suspend/resume cycle was performed.  Also, the 
> backlight would sometimes not get updated with the requested 
> value, requiring the user to change it back and forth until it 
> worked. 
>
> This series fixes both of the aforementioned issues found on 
> MT8192. 

Thanks for the series. This also improves backlight on MT8183.

I've been testing using the panfrost driver on a ChromiumOS 
userspace on a jacuzzi board and I've had issues like the screen 
going blank then not coming back, which these patches appear to 
solve. Many thanks!

Tested-by: Adrian Ratiu <adrian.ratiu@xxxxxxxxxxxxx>

> AngeloGioacchino Del Regno (2):
>   pwm: mtk-disp: Disable shadow registers before setting backlight
>     values
>   pwm: mtk-disp: Configure double buffering before reading in
>     .get_state()
>
>  drivers/pwm/pwm-mtk-disp.c | 34 +++++++++++++++++++++++-----------
>  1 file changed, 23 insertions(+), 11 deletions(-)
>
> --
> 2.39.0