linux-kernel - Re: [linux-sunxi] Re: [PATCH 10/15] drm/sun4i: tcon: Switch mux on only for composite

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Message-ID: <20170309145539.43eequth2ej7wvqk@lukather>
Date:   Thu, 9 Mar 2017 15:55:39 +0100
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     Chen-Yu Tsai <wens@...e.org>
Cc:     Mike Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Daniel Vetter <daniel.vetter@...el.com>,
        David Airlie <airlied@...ux.ie>,
        Mark Rutland <mark.rutland@....com>,
        Rob Herring <robh+dt@...nel.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-clk <linux-clk@...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: [linux-sunxi] Re: [PATCH 10/15] drm/sun4i: tcon: Switch mux on
 only for composite

On Thu, Mar 09, 2017 at 07:31:27PM +0800, Chen-Yu Tsai wrote:
> >> Additionally, the mux registers are only valid in the first TCON, meaning
> >> it must available be active in 2 pipeline chips. It's also why we'd pass
> >> "struct drm_device *" instead of "struct sun4i_tcon *".
> >
> > Hmmmm. That's going to be tricky to support. Has this been confirmed
> > somehow? Is the register used for something else on TCON1?
> 
> At this point, the only reference is Allwinner's kernel, and the old 3.4
> kernel for A10/A20. I could try getting HDMI working on the A31 to get
> some real results.
> 
> FWIW, the registers do not seem to be aliased across the two TCONs.

Then maybe we don't need to care, and we can just always write to the
mux?

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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