Re: [PATCH v4 00/24] drm/bridge: Make panel and bridge probe order consistent

From: Maxime Ripard <maxime@cerno.tech>
To: John Stultz <john.stultz@linaro.org>
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>,
	Sean Paul <sean@poorly.run>,
	"open list:DRM DRIVER FOR MSM ADRENO GPU" 
	<freedreno@lists.freedesktop.org>,
	Kyungmin Park <kyungmin.park@samsung.com>,
	lkml <linux-kernel@vger.kernel.org>,
	Xinliang Liu <xinliang.liu@linaro.org>,
	Seung-Woo Kim <sw0312.kim@samsung.com>,
	Tian Tao <tiantao6@hisilicon.com>,
	Inki Dae <inki.dae@samsung.com>,
	Linux Samsung SOC <linux-samsung-soc@vger.kernel.org>,
	linux-arm-msm <linux-arm-msm@vger.kernel.org>,
	Rob Clark <robdclark@gmail.com>,
	dri-devel <dri-devel@lists.freedesktop.org>,
	Chen Feng <puck.chen@hisilicon.com>,
	Xinwei Kong <kong.kongxinwei@hisilicon.com>,
	Joonyoung Shim <jy0922.shim@samsung.com>
Subject: Re: [PATCH v4 00/24] drm/bridge: Make panel and bridge probe order consistent
Date: Wed, 13 Oct 2021 15:45:13 +0200	[thread overview]
Message-ID: <20211013134513.hm6ftktkbh4kpudv@gilmour> (raw)
In-Reply-To: <CALAqxLW=dJSmfaHAL=BfYVVxZHQvzJWu4UjMixwgM=Nh85JVNw@mail.gmail.com>

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Hi John,

On Wed, Sep 29, 2021 at 04:29:42PM -0700, John Stultz wrote:
> On Wed, Sep 29, 2021 at 2:51 PM John Stultz <john.stultz@linaro.org> wrote:
> >
> > On Wed, Sep 29, 2021 at 2:32 PM John Stultz <john.stultz@linaro.org> wrote:
> > > On Wed, Sep 29, 2021 at 2:27 PM John Stultz <john.stultz@linaro.org> wrote:
> > > > On Fri, Sep 10, 2021 at 3:12 AM Maxime Ripard <maxime@cerno.tech> wrote:
> > > > > The best practice to avoid those issues is to register its functions only after
> > > > > all its dependencies are live. We also shouldn't wait any longer than we should
> > > > > to play nice with the other components that are waiting for us, so in our case
> > > > > that would mean moving the DSI device registration to the bridge probe.
> > > > >
> > > > > I also had a look at all the DSI hosts, and it seems that exynos, kirin and msm
> > > > > would be affected by this and wouldn't probe anymore after those changes.
> > > > > Exynos and kirin seems to be simple enough for a mechanical change (that still
> > > > > requires to be tested), but the changes in msm seemed to be far more important
> > > > > and I wasn't confortable doing them.
> > > >
> > > >
> > > > Hey Maxime,
> > > >   Sorry for taking so long to get to this, but now that plumbers is
> > > > over I've had a chance to check it out on kirin
> > > >
> > > > Rob Clark pointed me to his branch with some fixups here:
> > > >    https://gitlab.freedesktop.org/robclark/msm/-/commits/for-mripard/bridge-rework
> > > >
> > > > But trying to boot hikey with that, I see the following loop indefinitely:
> > > > [    4.632132] adv7511 2-0039: supply avdd not found, using dummy regulator
> > > > [    4.638961] adv7511 2-0039: supply dvdd not found, using dummy regulator
> > > > [    4.645741] adv7511 2-0039: supply pvdd not found, using dummy regulator
> > > > [    4.652483] adv7511 2-0039: supply a2vdd not found, using dummy regulator
> > > > [    4.659342] adv7511 2-0039: supply v3p3 not found, using dummy regulator
> > > > [    4.666086] adv7511 2-0039: supply v1p2 not found, using dummy regulator
> > > > [    4.681898] adv7511 2-0039: failed to find dsi host
> > >
> > > I just realized Rob's tree is missing the kirin patch. My apologies!
> > > I'll retest and let you know.
> >
> > Ok, just retested including the kirin patch and unfortunately I'm
> > still seeing the same thing.  :(
> >
> > Will dig a bit and let you know when I find more.
> 
> Hey Maxime!
>   I chased down the issue. The dsi probe code was still calling
> drm_of_find_panel_or_bridge() in order to succeed.
> 
> I've moved the logic that looks for the bridge into the bridge_init
> and with that it seems to work.
> 
> Feel free (assuming it looks ok) to fold this change into your kirin patch:
>   https://git.linaro.org/people/john.stultz/android-dev.git/commit/?id=4a35ccc4d7a53f68d6d93da3b47e232a7c75b91d

Thanks for testing, I've picked and squashed your fixup

Maxime

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