linux-kernel - Re: [PATCH v3 09/24] drm/sun4i: Don't skip TCONs if they don't have channel 0

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Message-ID: <CAGb2v64EkVK+AEngEuadBzAZagyU7eyOhHhBh0iFrxS+-BbCYQ@mail.gmail.com>
Date:   Thu, 28 Jun 2018 09:51:31 +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>,
        Gustavo Padovan <gustavo@...ovan.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Sean Paul <seanpaul@...omium.org>,
        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-clk <linux-clk@...r.kernel.org>,
        linux-sunxi <linux-sunxi@...glegroups.com>
Subject: Re: [PATCH v3 09/24] drm/sun4i: Don't skip TCONs if they don't have
 channel 0

On Mon, Jun 25, 2018 at 8:02 PM, Jernej Skrabec <jernej.skrabec@...l.net> wrote:
> TV TCONs (channel 1 only) are always connected to TV or HDMI encoder.
> Because of that, all output endpoints on such TCON node will point to a
> encoder which is part of component framework.
>
> Correct current graph traversing algorithm in such way that it doesn't
> skip output enpoints with id 0 on TV TCONs.

No. Our bindings say that endpoint 0 _is_ channel 0. For TCONs that don't
have channel 0, it must be skipped.

ChenYu