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 10:46:25 +0200
From:   Maxime Ripard <maxime@...no.tech>
To:     Marek Szyprowski <m.szyprowski@...sung.com>,
        Rob Clark <robdclark@...il.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>,
        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

On Fri, Oct 29, 2021 at 10:36:00AM +0200, Marek Szyprowski wrote:
> Hi Mexime,
> 
> On 29.10.2021 10:05, Maxime Ripard wrote:
> > On Fri, Oct 29, 2021 at 08:23:45AM +0200, Marek Szyprowski wrote:
> >> 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?
> 
> Yes, I did my test directly on linux next-20211028, which also contains 
> it. What might be important in my case, my DragonBoard 410c doesn't have 
> any display attached.
> 
> I've also noticed the following error during boot:
> 
> [   23.847651] msm_mdp 1a01000.mdp: Adding to iommu group 3
> [   23.866044] msm_mdp 1a01000.mdp: No interconnect support may cause 
> display underflows!
> [   23.957949] irq: no irq domain found for mdss@...0000 !
> [   23.958014] msm_dsi 1a98000.dsi: failed to request IRQ0: -22
> [   23.962229] msm_dsi: probe of 1a98000.dsi failed with error -22
> 
> The above errors appeared in next-20211028 for the first time. I assume 
> that they are related.

Yeah, it's likely that the DSI host cannot probe anymore, and the DSI
bridge thus cannot find its DSI host. Rob, do you know what could be
going on?

Maxime

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