linux-kernel - Re: [RFC PATCH v2 3/9] drm/panel: nv3052c: Sleep for 150ms after reset

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Message-ID: <ZQi8Z45VCqr-GqN6@titan>
Date:   Tue, 19 Sep 2023 07:08:55 +1000
From:   John Watts <contact@...kia.org>
To:     Paul Cercueil <paul@...pouillou.net>
Cc:     Jessica Zhang <quic_jesszhan@...cinc.com>,
        dri-devel@...ts.freedesktop.org,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Sam Ravnborg <sam@...nborg.org>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Chris Morgan <macromorgan@...mail.com>,
        Jagan Teki <jagan@...eble.ai>,
        Christophe Branchereau <cbranchereau@...il.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v2 3/9] drm/panel: nv3052c: Sleep for 150ms after
 reset

On Mon, Sep 18, 2023 at 11:01:15PM +0200, Paul Cercueil wrote:
> The datasheet does say a 5ms sleep time is necesary after a reset. I
> assume the 120ms delay you quote is when a *software* reset is
> performed in Sleep-out mode. The code here does a hard-reset.
> 
> Cheers,
> -Paul

Hello Paul,

Section 7.3 of the data sheet (AC characteristic) says that the reset can take
up to 120ms to complete if the reset is applied during sleep out mode.

John.