[PATCH v1] drm/bridge: simple-bridge: Add support for TI TDP158

[Maxime Ripard]

On Tue, May 28, 2024 at 10:05:50AM GMT, Arnaud Vrac wrote:
> On 28/05/2024 09:43, Maxime Ripard wrote:
> > Hi,
> > 
> > On Mon, May 27, 2024 at 06:03:56PM GMT, Marc Gonzalez wrote:
> > > From: Arnaud Vrac <avrac at freebox.fr>
> > > 
> > > The TI TDP158 is an AC-Coupled HDMI signal to TMDS Redriver supporting
> > > DVI 1.0 and HDMI 1.4b and 2.0b output signals.
> > > 
> > > Since it's an I2C-programmable bridge, it could have a proper driver,
> > > but the default settings work fine, thus simple bridge is sufficient.
> > 
> > No it doesn't. That bridge supports HDMI 2.0 which means you'll need to
> > change the TMDS clock ratio when programming a TMDS character rate
> > higher than 340MHz. And you'll need hotplug support to deal with it
> > properly too.
> > 
> > So sorry, you need a real driver there.
> 
> Hello, this is an HDMI redriver, which simply cleans up the HDMI
> signal, so no programming is needed to support HDMI 2.0.

I mean, if I'm to trust the datasheet, it is more complicated than that.
It snoops the DDC bus so it can update the TMDS clock ratio bit if it's
sent on its input side, but that wouldn't happen with DP for example.

Maxime
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