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Date: Wed, 2 Feb 2022 13:17:14 +0100
From: "H. Nikolaus Schaller" <hns@...delico.com>
To: Paul Cercueil <paul@...pouillou.net>
Cc: Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
Geert Uytterhoeven <geert+renesas@...der.be>,
Kees Cook <keescook@...omium.org>,
"Eric W. Biederman" <ebiederm@...ssion.com>,
Miquel Raynal <miquel.raynal@...tlin.com>,
David Airlie <airlied@...ux.ie>,
Daniel Vetter <daniel@...ll.ch>,
Neil Armstrong <narmstrong@...libre.com>,
Robert Foss <robert.foss@...aro.org>,
Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
Jernej Skrabec <jernej.skrabec@...il.com>,
Harry Wentland <harry.wentland@....com>,
Sam Ravnborg <sam@...nborg.org>,
Maxime Ripard <maxime@...no.tech>,
Hans Verkuil <hverkuil-cisco@...all.nl>,
Liam Girdwood <lgirdwood@...il.com>,
Mark Brown <broonie@...nel.org>,
Paul Boddie <paul@...die.org.uk>,
Andrzej Hajda <andrzej.hajda@...el.com>,
Kieran Bingham <kieran.bingham+renesas@...asonboard.com>,
devicetree@...r.kernel.org, linux-mips@...r.kernel.org,
linux-kernel@...r.kernel.org, letux-kernel@...nphoenux.org,
Jonas Karlman <jonas@...boo.se>,
dri-devel@...ts.freedesktop.org,
Ezequiel Garcia <ezequiel@...labora.com>
Subject: Re: [PATCH v12 2/9] drm/ingenic: Add support for JZ4780 and HDMI
output
Hi Paul,
> Am 02.02.2022 um 13:06 schrieb Paul Cercueil <paul@...pouillou.net>:
>
> Hi Nikolaus,
>
>>>> @@ -446,6 +454,9 @@ static int ingenic_drm_plane_atomic_check(struct drm_plane *plane,
>>>> if (!crtc)
>>>> return 0;
>>>> + if (plane == &priv->f0)
>>>> + return -EINVAL;
>>> This will break JZ4725B -> JZ4770 SoCs, the f0 plane is perfectly usable there.
>> Hm. I think it was your request/proposal to add this [1]?
>
> Because otherwise with your current patchset the f0 plane does not work *on JZ4780*.
Not that I am eager to fix that, but...
maybe it could be better to fix than having the check and -EINVAL depend on SoC compatible string
(or some new flag in soc_info. plane_f0_not_working)?
> It does work on older SoCs.
>
>> What I have forgotten is why the f0 plane should not be usable for jz4780.
>
> We return an error here to prevent userspace from using the f0 plane until it's effectively working on the JZ4780.
Well, what would be not working with that plane if user-space would try to use it?
>
> Cheers,
> -Paul
BR and thanks,
Nikolaus
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