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

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Message-ID: <fdd446c6-c8ce-9dae-f7ac-e06241f76250@canonical.com>
Date:   Fri, 25 Jun 2021 11:21:34 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:     Jagan Teki <jagan@...rulasolutions.com>,
        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, 24 Jun 2021 at 14:19, 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 ?

Yes, I mentioned few guys in reply to PHY. Around the DRM drivers you
can get in touch with:
Inki Dae <inki.dae@...sung.com>
Seung-Woo Kim <sw0312.kim@...sung.com>
Marek Szyprowski <m.szyprowski@...sung.com>
Andrzej Hajda <a.hajda@...sung.com>

The easiest testing of the display stack would be on Hardkernel's Odroid
XU4 (https://www.hardkernel.com/shop/odroid-xu4-special-price/) however
you will not test the DSI/DSIM directly (it has only HDMI port).

Best regards,
Krzysztof
Best regards,
Krzysztof