linux-kernel - Re: [PATCH v1 7/8] drm: rcar-du: dsi: Add r8A779g0 support

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Message-ID: <8d848493-24a8-4ffb-239e-9e7baa232a42@ideasonboard.com>
Date:   Thu, 17 Nov 2022 17:49:36 +0200
From:   Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
To:     Kieran Bingham <kieran.bingham+renesas@...asonboard.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Magnus Damm <magnus.damm@...il.com>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org
Cc:     Andrzej Hajda <andrzej.hajda@...el.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Robert Foss <robert.foss@...aro.org>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Tomi Valkeinen <tomi.valkeinen+renesas@...asonboard.com>
Subject: Re: [PATCH v1 7/8] drm: rcar-du: dsi: Add r8A779g0 support

On 17/11/2022 17:46, Kieran Bingham wrote:
>> +       if (ret)
>> +               return ret;
>> +
>> +       if (setup_info->hsfreq <= MHZ(1000))
>> +               ret = WRITE_PHTW(0x01020100, 0x01910170, 0x01020171,
>> +                                0x01110172);
> The <=1Gbps reads:
> 
> <=1Gbps
> 
> Set PHTW=H’01020100
> Set PHTW=H’01010172
> Set PHTW=H’01570170
> Set PHTW=H’01060171
> Set PHTW=H’01110172
> 
> Is it clear why theres a difference here?

What doc is that? Mine (R19UH0172EJ0054 Rev.0.54) says:

Set PHTW=H’01020100
Set PHTW=H’01910170
Set PHTW=H’01020171
Set PHTW=H’01110172

  Tomi