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: <2676604.ZYCNkuCdbT@jernej-laptop>
Date:   Thu, 28 Jun 2018 06:45:56 +0200
From:   Jernej Škrabec <jernej.skrabec@...l.net>
To:     Chen-Yu Tsai <wens@...e.org>
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

Dne četrtek, 28. junij 2018 ob 03:51:31 CEST je Chen-Yu Tsai napisal(a):
> 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.

I'm not sure where this is stated. I read TCON binding again. Can you please 
point me to it?

So on TV TCONs on R40 (without channel 0) TVE would be endpoint 1 and HDMI 
endpoint 2 (or the other way around)?

Best regards,
Jernej