linux-kernel - Re: [5.2][PATCH 0/3] Ingenic JZ47xx KMS driver

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Date:   Tue, 16 Apr 2019 11:02:35 -0300
From:   Ezequiel Garcia <ezequiel@...labora.com>
To:     Paul Cercueil <paul@...pouillou.net>
Cc:     David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Sean Paul <sean@...rly.run>, devicetree@...r.kernel.org,
        linux-mips@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [5.2][PATCH 0/3] Ingenic JZ47xx KMS driver

On Mon, 2019-03-11 at 12:45 +0100, Paul Cercueil wrote:
> Hi Ezequiel,
> 
> On Mon, Mar 11, 2019 at 1:02 AM, Ezequiel Garcia 
> <ezequiel@...labora.com> wrote:
> > On Thu, 2019-02-28 at 19:07 -0300, Paul Cercueil wrote:
> > >  Hi,
> > > 
> > >  This is a first attempt at a KMS driver for the JZ47xx MIPS SoCs by
> > >  Ingenic. It is aimed to replace the aging jz4740-fb driver.
> > > 
> > >  The driver will later be updated with new features (overlays, TV-out
> > >  etc.), that's why I didn't go with the simple/tiny DRM driver.
> > > 
> > >  The driver has been tested on the Ben Nanonote (JZ4740) and the
> > >  RetroMini RS-90 (JZ4725B) handheld gaming console.
> > > 
> > 
> > Does this support JZ4780? Or otherwise,
> > is there any similarity with JZ4780 display controller?
> > 
> > Thanks,
> > Eze
> 
> The JZ4780 LCD controller would in theory work with this driver, but
> to test on the CI20 you'd need to add support for HDMI first.
> 

After reviewing a bit this driver and the JZ480 one on the CI20 repo,
there seems to be some differences.

To begin with, the JZ480 apparently has a new 8-word descriptor.

The HDMI looks pretty much a Synopsys DW HDMI, mostly compatible
with the dw-hdmi encoder.

I'll try to put together some patches to enable JZ4780 support.
Won't happen anytime soon, so if anyone wants to give it
a shot, be my guest :-)

Regards,
Eze