Re: [PATCH v5 11/13] drm/panel: st7703: Assert reset prior to powering down the regulators

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Subject: Re: [PATCH v5 11/13] drm/panel: st7703: Assert reset prior to powering down the regulators
From: Linus Walleij <linus.walleij@xxxxxxxxxx>
Date: Wed, 1 Jul 2020 09:51:40 +0200
Cc: linux-sunxi <linux-sunxi@xxxxxxxxxxxxxxxx>, Thierry Reding <thierry.reding@xxxxxxxxx>, Sam Ravnborg <sam@xxxxxxxxxxxx>, David Airlie <airlied@xxxxxxxx>, Daniel Vetter <daniel@xxxxxxxx>, Guido Günther <agx@xxxxxxxxxxx>, Purism Kernel Team <kernel@xxxxxxx>, Rob Herring <robh+dt@xxxxxxxxxx>, Maxime Ripard <mripard@xxxxxxxxxx>, Chen-Yu Tsai <wens@xxxxxxxx>, Icenowy Zheng <icenowy@xxxxxxx>, "open list:DRM PANEL DRIVERS" <dri-devel@xxxxxxxxxxxxxxxxxxxxx>, "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" <devicetree@xxxxxxxxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, Linux ARM <linux-arm-kernel@xxxxxxxxxxxxxxxxxxx>, Samuel Holland <samuel@xxxxxxxxxxxx>, Martijn Braam <martijn@xxxxxxxxx>, Luca Weiss <luca@xxxxxxxxx>, Bhushan Shah <bshah@xxxxxxx>
In-reply-to: <20200626005601.241022-12-megous@megous.com>

On Fri, Jun 26, 2020 at 2:56 AM Ondrej Jirman <megous@xxxxxxxxxx> 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.
>
> Signed-off-by: Ondrej Jirman <megous@xxxxxxxxxx>

Reviewed-by: Linus Walleij <linus.walleij@xxxxxxxxxx>

Yours,
Linus Walleij

References:
- [PATCH v5 00/13] Add support for PinePhone LCD panel
  - From: Ondrej Jirman
- [PATCH v5 11/13] drm/panel: st7703: Assert reset prior to powering down the regulators
  - From: Ondrej Jirman

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