Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Message-ID: <16b99f4040a1837bcdbf860d0e9517eb53002aed.camel@collabora.com>
Subject: Re: [5.2][PATCH 0/3] Ingenic JZ47xx KMS driver
From:   Ezequiel Garcia <ezequiel@collabora.com>
To:     Paul Cercueil <paul@crapouillou.net>
Cc:     David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>,
        Rob Herring <robh+dt@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
        Maxime Ripard <maxime.ripard@bootlin.com>,
        Sean Paul <sean@poorly.run>, devicetree@vger.kernel.org,
        linux-mips@vger.kernel.org, dri-devel@lists.freedesktop.org,
        linux-kernel@vger.kernel.org
Date:   Tue, 16 Apr 2019 11:02:35 -0300
In-Reply-To: <1552304705.1929.0@crapouillou.net>
References: <20190228220756.20262-1-paul@crapouillou.net>
         <fce3f17981cda6a263abcce6b2902591e7984fa4.camel@collabora.com>
         <1552304705.1929.0@crapouillou.net>
Organization: Collabora
Content-Type: text/plain; charset="UTF-8"
User-Agent: Evolution 3.30.5-1 
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

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@collabora.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