linux-kernel - Re: [v6,02/21] drm/bridge: adv7511: Register and attach our DSI device at probe

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Date:   Fri, 29 Oct 2021 10:05:21 +0200
From:   Maxime Ripard <maxime@...no.tech>
To:     Marek Szyprowski <m.szyprowski@...sung.com>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Robert Foss <robert.foss@...aro.org>,
        Jonas Karlman <jonas@...boo.se>,
        Daniel Vetter <daniel.vetter@...el.com>,
        David Airlie <airlied@...ux.ie>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Sam Ravnborg <sam@...nborg.org>,
        Neil Armstrong <narmstrong@...libre.com>,
        Seung-Woo Kim <sw0312.kim@...sung.com>,
        linux-arm-msm@...r.kernel.org,
        Joonyoung Shim <jy0922.shim@...sung.com>,
        Rob Clark <robdclark@...il.com>,
        Tian Tao <tiantao6@...ilicon.com>,
        Chen Feng <puck.chen@...ilicon.com>,
        Xinwei Kong <kong.kongxinwei@...ilicon.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        linux-samsung-soc@...r.kernel.org,
        Xinliang Liu <xinliang.liu@...aro.org>,
        John Stultz <john.stultz@...aro.org>,
        linux-kernel@...r.kernel.org, Inki Dae <inki.dae@...sung.com>,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        Sean Paul <sean@...rly.run>
Subject: Re: [v6,02/21] drm/bridge: adv7511: Register and attach our DSI
 device at probe

Hi Marek,

On Fri, Oct 29, 2021 at 08:23:45AM +0200, Marek Szyprowski wrote:
> Hi,
> 
> On 25.10.2021 17:15, Maxime Ripard wrote:
> > In order to avoid any probe ordering issue, the best practice is to move
> > the secondary MIPI-DSI device registration and attachment to the
> > MIPI-DSI host at probe time. Let's do this.
> >
> > Acked-by: Sam Ravnborg <sam@...nborg.org>
> > Tested-by: John Stultz <john.stultz@...aro.org>
> > Signed-off-by: Maxime Ripard <maxime@...no.tech>
>
> This patch landed in linux-next as commit 864c49a31d6b ("drm/bridge:
> adv7511: Register and attach our DSI device at probe"). Sadly it causes
> endless probe-fail-defer loop on DragonBoard 410c board
> (arch/arm64/boot/dts/qcom/apq8016-sbc.dts):

I'm sorry to hear that (but would have been surprised if it didn't occur)

This is supposed to be fixed by 8f59ee9a570c ("drm/msm/dsi: Adjust probe
order"). Do you have that patch applied?

Maxime

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