linux-kernel - Re: [PATCH 11/17] drm/sun4i: tcon: Add another way for matching mixers with tcon

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Date:   Wed, 11 Jul 2018 00:12:45 +0800
From:   Chen-Yu Tsai <wens@...e.org>
To:     Jernej Skrabec <jernej.skrabec@...l.net>
Cc:     Maxime Ripard <maxime.ripard@...tlin.com>,
        Rob Herring <robh+dt@...nel.org>,
        David Airlie <airlied@...ux.ie>,
        Mark Rutland <mark.rutland@....com>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-sunxi <linux-sunxi@...glegroups.com>
Subject: Re: [PATCH 11/17] drm/sun4i: tcon: Add another way for matching
 mixers with tcon

On Sat, Jul 7, 2018 at 1:51 AM, Jernej Skrabec <jernej.skrabec@...l.net> wrote:
> Till now, new way of matching engines with TCONs was reading their
> respective ids and match them by those ids. However, with introduction
> of TCON TOP, that might not be so straightforward anymore.
> - there might be more TCONs that engines (mixers)
> - TCON ids might have non-consecutive ids
>
> Workaround that by matching mixer id with TCON index from TCON list.
>
> For example, R40 has 2 mixers and 4 TCONs. Board designer can choose
> 2 outputs, which are connected to any of those 4 TCONs. As long as there
> are only 2 TCONs enabled in DT, using index in list as alternative id,
> will allow to match them with mixer 0 and 1.
>
> Signed-off-by: Jernej Skrabec <jernej.skrabec@...l.net>

Reviewed-by: Chen-Yu Tsai <wens@...e.org>