linux-kernel - Re: [PATCH v2 2/2] drm/vc4: Disable V3D interactions if the v3d component didn't probe.

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Date:   Wed, 03 Apr 2019 12:15:29 -0700
From:   Eric Anholt <eric@...olt.net>
To:     Paul Kocialkowski <paul.kocialkowski@...tlin.com>,
        dri-devel@...ts.freedesktop.org
Cc:     linux-kernel@...r.kernel.org,
        Maxime Ripard <maxime.ripard@...tlin.com>
Subject: Re: [PATCH v2 2/2] drm/vc4: Disable V3D interactions if the v3d component didn't probe.

Paul Kocialkowski <paul.kocialkowski@...tlin.com> writes:

> Hi,
>
> On Mon, 2019-04-01 at 11:35 -0700, Eric Anholt wrote:
>> One might want to use the VC4 display stack without using Mesa.
>> Similar to the debugfs fixes for not having all of the possible
>> display bits enabled, make sure you can't oops in vc4 if v3d isn't
>> enabled.
>
> Just thought about this: perhaps we should be returning -ENODEV instead
> of -EINVAL when !vc4->v3d, just so that the error is a bit more
> explicit to userspace?

I like it.  Doing that while applying the series.

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