linux-kernel - Re: [PATCH v2 2/2] drm/panel: s6d27a1: Add driver for Samsung S6D27A1 display panel

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Date:   Sun, 8 Aug 2021 00:37:57 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Markuss Broks <markuss.broks@...il.com>
Cc:     linux-kernel <linux-kernel@...r.kernel.org>,
        "thierry.reding@...il.com" <thierry.reding@...il.com>,
        Dave Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        "open list:DRM PANEL DRIVERS" <dri-devel@...ts.freedesktop.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, phone-devel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] drm/panel: s6d27a1: Add driver for Samsung S6D27A1
 display panel

Hi Markuss,

this is looking really good, the following is just nitty gritty details
I could fix while applying, we're mostly waiting for DT review now.

On Sat, Aug 7, 2021 at 3:31 PM Markuss Broks <markuss.broks@...il.com> wrote:

> +       /*
> +        * Exit sleep mode and initialize display - some hammering is
> +        * necessary.
> +        */
> +       mipi_dbi_command(dbi, MIPI_DCS_EXIT_SLEEP_MODE);
> +       mipi_dbi_command(dbi, MIPI_DCS_EXIT_SLEEP_MODE);

Check if this hammering is really necessary on s6d27a1, on Widechips
this is just a bug, what happens if you put just one of them?

> +       msleep(50);

This should be msleep(120) on s6d27a1 (according to board-codina-mcde.c)

Yours,
Linus Walleij