From: Maxime Ripard <maxime@cerno.tech>
To: Peter Robinson <pbrobinson@gmail.com>
Cc: stefan.wahren@i2se.com, Peter Mattern <pmattern@arcor.de>,
dri-devel@lists.freedesktop.org
Subject: Re: drm/vc4: module dysfunctional on Raspberry Pi 3B as of 5.18.0
Date: Thu, 9 Jun 2022 11:23:51 +0200 [thread overview]
Message-ID: <20220609092351.t2muybqjnqaqzemz@houat> (raw)
In-Reply-To: <20220608153608.ntgyokt67f3m7pn6@houat>
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On Wed, Jun 08, 2022 at 05:36:08PM +0200, Maxime Ripard wrote:
> On Wed, Jun 08, 2022 at 04:14:22PM +0100, Peter Robinson wrote:
> > > > > As of Linux 5.18.0, module vc4 apparently isn't working on Raspberry Pi
> > > > > 3B any more.
> > > > >
> > > > > If a monitor is attached to the device, the boot messages show up as
> > > > > usual, but right when KMS starts, the screen turns black. Similarly, the
> > > > > screen also turns black when the module is blacklisted at boot time and
> > > > > loaded from the running system.
> > > > > The problem looks quite similar to the one posted some months ago in [1].
> > >
> > > If I understand you properly, it results in a blank screen if the
> > > monitor is connected, but the system is still responsive?
> >
> > Yes, it boots fine, I see all serial console output and the module
> > loads etc, without a screen I didn't notice the issue
> >
> > > If so, it's a very different problem than the link you provided, since
> > > it was occurring when no monitor was connected and resulted in a total
> > > system hang.
> > >
> > > > > Unfortunately, looking through systemd's journal didn't seem to yield
> > > > > any real hint. Nevertheless, the results from grepping vc4 are
> > > >
> > > > I'm seeing the same issue with vc4 on a RPi3 on 5.18.1 on Fedora so
> > > > can confirm the regression. Maxime would know what might be up here?
> > >
> > > I tested on 5.18 on my 3B and it works well. Could you paste your kernel
> > > configuration and config.txt somewhere?
> >
> > It boots with output on 5.17.13, and not on 5.18.
>
> Interestingly, it works for 5.18 in my case but doesn't for the current
> drm-misc-next branch with similar symptoms.
>
> I'll look into that one and see if the two might be related.
Actually, it was because drm-misc-next was missing 88110a9f6209, and
thus the DRM driver wouldn't load.
Once that patch is applied, 5.18 and all -rc work fine on my side.
Could you start a bisection maybe?
Maxime
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next prev parent reply other threads:[~2022-06-09 9:23 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-05 18:01 drm/vc4: module dysfunctional on Raspberry Pi 3B as of 5.18.0 Peter Mattern
2022-06-08 13:10 ` Peter Robinson
2022-06-08 14:36 ` Maxime Ripard
2022-06-08 15:14 ` Peter Robinson
2022-06-08 15:36 ` Maxime Ripard
2022-06-09 9:23 ` Maxime Ripard [this message]
2022-06-09 11:49 ` Peter Robinson
2022-06-09 13:37 ` Peter Mattern
2022-06-08 22:47 ` Stefan Wahren
2022-06-09 11:52 ` Peter Robinson
2022-06-09 21:33 ` Stefan Wahren
2022-06-10 20:06 ` Stefan Wahren
2022-06-10 22:02 ` Peter Robinson
2022-06-09 13:08 ` Peter Mattern
2022-06-05 23:57 Stefan Wahren
2022-06-09 12:49 Peter Mattern
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