Re: [PATCH v6 11/13] drm/panel: st7703: Assert reset prior to powering down the regulators

[Guido Günther]

Hi,
On Wed, Jul 01, 2020 at 12:31:24PM +0200, Ondrej Jirman wrote:
> The reset pin is inverted, so if we don't assert reset, the actual gpio
> will be high and may keep driving the IO port of the panel.

Reviewed-by: Guido Günther <agx@xxxxxxxxxxx>

> 
> Signed-off-by: Ondrej Jirman <megous@xxxxxxxxxx>
> Reviewed-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
> ---
>  drivers/gpu/drm/panel/panel-sitronix-st7703.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/gpu/drm/panel/panel-sitronix-st7703.c b/drivers/gpu/drm/panel/panel-sitronix-st7703.c
> index 0c4167994d01..e303b7b1a215 100644
> --- a/drivers/gpu/drm/panel/panel-sitronix-st7703.c
> +++ b/drivers/gpu/drm/panel/panel-sitronix-st7703.c
> @@ -417,6 +417,7 @@ static int st7703_unprepare(struct drm_panel *panel)
>  	if (!ctx->prepared)
>  		return 0;
>  
> +	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
>  	regulator_disable(ctx->iovcc);
>  	regulator_disable(ctx->vcc);
>  	ctx->prepared = false;
> -- 
> 2.27.0
>