linux-kernel - Re: [PATCH] drm/panel: Avoid warnings w/ panel-simple/panel-edp at shutdown

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Date: Wed, 12 Jun 2024 09:52:40 -0700
From: Doug Anderson <dianders@...omium.org>
To: Doug Anderson <dianders@...omium.org>, Maxime Ripard <mripard@...nel.org>, 
	dri-devel@...ts.freedesktop.org, Neil Armstrong <neil.armstrong@...aro.org>, 
	Linus Walleij <linus.walleij@...aro.org>, Yuran Pereira <yuran.pereira@...mail.com>, 
	Chris Morgan <macromorgan@...mail.com>, David Airlie <airlied@...il.com>, 
	Jessica Zhang <quic_jesszhan@...cinc.com>, 
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, Thomas Zimmermann <tzimmermann@...e.de>, 
	linux-kernel@...r.kernel.org
Cc: Daniel Vetter <daniel@...ll.ch>
Subject: Re: [PATCH] drm/panel: Avoid warnings w/ panel-simple/panel-edp at shutdown

Sima,

On Wed, Jun 12, 2024 at 8:13 AM Daniel Vetter <daniel@...ll.ch> wrote:
>
> > > I ran the coccinelle script we started with, and here are the results:
> > >
> > > ./drivers/gpu/drm/vmwgfx/vmwgfx_drv.c:1640:25-39: ERROR: KMS driver vmw_pci_driver is missing shutdown implementation
> > > ./drivers/gpu/drm/kmb/kmb_drv.c:621:30-49: ERROR: KMS driver kmb_platform_driver is missing shutdown implementation
> > > ./drivers/gpu/drm/tiny/arcpgu.c:422:30-52: ERROR: KMS driver arcpgu_platform_driver is missing shutdown implementation
> >
> > Sure, although I think we agreed even back when we talked about this
> > last that your coccinelle script wasn't guaranteed to catch every
> > driver. ...so I guess the question is: are we willing to accept that
> > we'll stop disabling panels at shutdown for any drivers that might
> > were missed. For instance, looking at it by hand (which also could
> > miss things), I previously thought that we also might need:
> >
> > * nouveau
> > * tegra
> > * amdgpu
> > * sprd
> > * gma500
> > * radeon
> >
> > I sent patches for those drivers but they don't go through drm-misc
> > and some of the drivers had a lot of abstraction layers and were hard
> > to reason about. I'm also not 100% confident that all of those drivers
> > really are affected--they'd have to be used with panel-simple or
> > panel-edp...
>
> Aside from amdgpu and radeon they're all in -misc now, and Alex is
> generally fairly responsive.

Sorry for not keeping up with things, but can you point to where this
was documented or what patch changed things so that these drivers went
through drm-misc? From the MAINTAINERS file I see commit 5a44d50f0072
("MAINTAINERS: Update drm-misc entry to match all drivers") and that
shows several of these drivers as "X:". As far as I can tell that
means that they _aren't_ handled by drm-misc, right? Maybe the
decision was made elsewhere and MAINTAINERS was just not updated, or
I'm not looking at the right place? I checked drm-misc-next and
drm/next and, for instance, "tegra" and "kmb" still show as excluded.

-Doug