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Date:   Wed, 22 Sep 2021 10:53:08 +0200
From:   Maxime Ripard <maxime@cerno.tech>
To:     Marek Szyprowski <m.szyprowski@samsung.com>
Cc:     Andrzej Hajda <a.hajda@samsung.com>,
        Sam Ravnborg <sam@ravnborg.org>,
        Daniel Vetter <daniel.vetter@intel.com>,
        David Airlie <airlied@linux.ie>,
        Jonas Karlman <jonas@kwiboo.se>,
        Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
        Thierry Reding <thierry.reding@gmail.com>,
        Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
        Thomas Zimmermann <tzimmermann@suse.de>,
        Neil Armstrong <narmstrong@baylibre.com>,
        Robert Foss <robert.foss@linaro.org>,
        Jernej Skrabec <jernej.skrabec@gmail.com>,
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        Kyungmin Park <kyungmin.park@samsung.com>,
        linux-kernel@vger.kernel.org,
        Xinliang Liu <xinliang.liu@linaro.org>,
        Seung-Woo Kim <sw0312.kim@samsung.com>,
        Tian Tao <tiantao6@hisilicon.com>,
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        John Stultz <john.stultz@linaro.org>,
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        Xinwei Kong <kong.kongxinwei@hisilicon.com>,
        Joonyoung Shim <jy0922.shim@samsung.com>
Subject: Re: [PATCH v4 24/24] drm/exynos: dsi: Adjust probe order
Message-ID: <20210922085308.udvhfbzpn3vpbksr@gilmour>
References: <20210910101218.1632297-1-maxime@cerno.tech>
 <CGME20210910101445eucas1p172f99ff7fe853052fc457861c3174f9e@eucas1p1.samsung.com>
 <20210910101218.1632297-25-maxime@cerno.tech>
 <29a2111d-024b-4d9e-27ef-e3399509ff32@samsung.com>
 <fc1fbd42-6ed4-9d67-2903-8f9cc2aaad43@samsung.com>
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Hi Marek,

On Fri, Sep 17, 2021 at 02:35:05PM +0200, Marek Szyprowski wrote:
> Hi,
>=20
> On 13.09.2021 12:30, Andrzej Hajda wrote:
> > W dniu 10.09.2021 o=A012:12, Maxime Ripard pisze:
> >> Without proper care and an agreement between how DSI hosts and devices
> >> drivers register their MIPI-DSI entities and potential components, we =
can
> >> end up in a situation where the drivers can never probe.
> >>
> >> Most drivers were taking evasive maneuvers to try to workaround this,
> >> but not all of them were following the same conventions, resulting in
> >> various incompatibilities between DSI hosts and devices.
> >>
> >> Now that we have a sequence agreed upon and documented, let's convert
> >> exynos to it.
> >>
> >> Signed-off-by: Maxime Ripard <maxime@cerno.tech>
> > This patch should be dropped, as it will probably break the driver.
> >
> > Exynos is already compatible with the pattern
> > register-bus-then-get-sink, but it adds/removes panel/bridge
> > dynamically, so it creates drm_device without waiting for downstream si=
nk.
>=20
> Right, this patch breaks Exynos DSI driver operation. Without it, the=20
> whole series works fine on all Exynos based test boards.

Thanks for testing. Did you have any board using one of those bridges in
your test sample?

Thanks!
Maxime

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