linux-kernel - Re: [PATCH] drm/panel: otm8009a: add delay at the end of initialization

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Message-ID: <20190403162226.GO5238@ulmo>
Date:   Wed, 3 Apr 2019 18:22:26 +0200
From:   Thierry Reding <thierry.reding@...il.com>
To:     Yannick Fertré <yannick.fertre@...com>
Cc:     Philippe Cornu <philippe.cornu@...com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com
Subject: Re: [PATCH] drm/panel: otm8009a: add delay at the end of
 initialization

On Thu, Mar 21, 2019 at 09:04:05AM +0100, Yannick Fertré wrote:
> At the end of initialization, a delay is required by the panel.
> Without this delay, the panel could received a frame early &
> generate a crash of panel (black screen).
> 
> Signed-off-by: Yannick Fertré <yannick.fertre@...com>
> ---
>  drivers/gpu/drm/panel/panel-orisetech-otm8009a.c | 3 +++
>  1 file changed, 3 insertions(+)

Applied. You might want to go over this panel and replace some of the
mdelay() calls with msleep(). There are some that busy loop for 120 ms,
which is somewhat rude. Even the mdelay(10) in this driver should be
safe to convert to msleep().

Thierry

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