[PATCH V2 2/5] drm/panel-elida-kd35t133: hold panel in reset for unprepare

[Jessica Zhang]

On 11/17/2023 11:44 AM, Chris Morgan wrote:
> From: Chris Morgan <macromorgan at hotmail.com>
> 
> For devices like the Anbernic RG351M and RG351P the panel is wired to
> an always on regulator. When the device suspends and wakes up, there
> are some slight artifacts on the screen that go away over time. If
> instead we hold the panel in reset status after it is unprepared,
> this does not happen.
> 
> Fixes: 5b6603360c12 ("drm/panel: add panel driver for Elida KD35T133 panels")
> Signed-off-by: Chris Morgan <macromorgan at hotmail.com>

Reviewed-by: Jessica Zhang <quic_jesszhan at quicinc.com>

> ---
>   drivers/gpu/drm/panel/panel-elida-kd35t133.c | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/gpu/drm/panel/panel-elida-kd35t133.c b/drivers/gpu/drm/panel/panel-elida-kd35t133.c
> index 6cd8536c09ff..f1fc4a26f447 100644
> --- a/drivers/gpu/drm/panel/panel-elida-kd35t133.c
> +++ b/drivers/gpu/drm/panel/panel-elida-kd35t133.c
> @@ -104,6 +104,8 @@ static int kd35t133_unprepare(struct drm_panel *panel)
>   		return ret;
>   	}
>   
> +	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
> +
>   	regulator_disable(ctx->iovcc);
>   	regulator_disable(ctx->vdd);
>   
> -- 
> 2.34.1
>