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

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Message-ID: <CAMty3ZBuPCGYrC=Poucrotvaf3ZT2PnAeCbv-iq7vnQLS=KgNQ@mail.gmail.com>
Date:   Fri, 25 Jun 2021 13:49:49 +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

On Thu, Jun 24, 2021 at 6:17 PM Laurent Pinchart
<laurent.pinchart@...asonboard.com> wrote:
>
> On Thu, Jun 24, 2021 at 06:02:36PM +0530, Jagan Teki wrote:
> > 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?
>
> Tomasz hasn't been working for Samsung for a loooong time (I've dropped
> his Samsung address from the CC list for this reason).

Okay. I think exynos drm maintainers might help out here, but not sure of it.

>
> > 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)
>
> I think it should be turned into a real drm_bridge, it's currently
> implemented based on drm_encoder.

Yes, ie what I'm trying for.

Jagan.