linux-kernel - Re: [RFC PATCH 2/9] drm: bridge: Add Samsung SEC MIPI DSIM bridge driver

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Message-ID: <CAMty3ZA=1xreRB+SZOwj6khH6+nLsE_ND5599xfV8J=LzGFYYQ@mail.gmail.com>
Date:   Thu, 24 Jun 2021 18:02:36 +0530
From:   Jagan Teki <jagan@...rulasolutions.com>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:     Fabio Estevam <festevam@...il.com>,
        Michael Tretter <m.tretter@...gutronix.de>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, Peng Fan <peng.fan@....com>,
        Francis Laniel <francis.laniel@...rulasolutions.com>,
        Matteo Lisi <matteo.lisi@...icam.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        linux-amarula <linux-amarula@...rulasolutions.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Robert Foss <robert.foss@...aro.org>,
        Andrzej Hajda <a.hajda@...sung.com>,
        DRI mailing list <dri-devel@...ts.freedesktop.org>,
        Milco Pratesi <milco.pratesi@...icam.com>,
        Anthony Brandon <anthony@...rulasolutions.com>,
        linux-phy@...ts.infradead.org, Fancy Fang <chen.fang@....com>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        NXP Linux Team <linux-imx@....com>
Subject: Re: [RFC PATCH 2/9] drm: bridge: Add Samsung SEC MIPI DSIM bridge driver

Hi Laurent,

On Thu, Jun 24, 2021 at 5:48 PM Laurent Pinchart
<laurent.pinchart@...asonboard.com> wrote:
>
> Hi Jagan,
>
> On Thu, Jun 24, 2021 at 05:42:43PM +0530, Jagan Teki wrote:
> > On Thu, Jun 24, 2021 at 8:18 AM Fabio Estevam wrote:
> > > On Wed, Jun 23, 2021 at 7:23 PM Laurent Pinchart wrote:
> > >
> > > > Looking at the register set, it seems to match the Exynos 5433,
> > > > supported by drivers/gpu/drm/exynos/exynos_drm_dsi.c. Can we leverage
> > > > that driver instead of adding a new one for the same IP core ?
> > >
> > > Yes. there was an attempt from Michael in this direction:
> > > https://patchwork.kernel.org/project/dri-devel/cover/20200911135413.3654800-1-m.tretter@pengutronix.de/
> >
> > Thanks for the reference, I will check it out and see I can send any
> > updated versions wrt my i.MX8MM platform.
>
> Thanks.
>
> I had a brief look at the exynos driver, and I think it should be turned
> into a DRM bridge as part of this rework to be used with the i.MX8MM.
>
> Is there someone from Samsung who could assist, at least to test the
> changes ?

I have hardware to verify it on i.MX8MM but from exynos I don't have
any contact from Samsung to suggest or test. Maybe I can add Tomasz
Figa while sending the changes?

I understand that there are 2 key implementations.

1. Adjust the exynos_drm_dsi.c by dropping component_ops as i.MX8MM
flow with LCDIF doesn't have component_ops (make sure it works with
exynos platform first)
2. Sec DSIM Bridge driver common cross Exynos and i.MX8MM platform
drivers or only one Sec DSIM bridge driver to handle both the
platforms by differentiating compatible and driver data

Any more suggestions would be appreciated?

Jagan.