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From:   Eric Anholt <eric@anholt.net>
To:     Paul Kocialkowski <paul.kocialkowski@bootlin.com>,
        dri-devel@lists.freedesktop.org
Cc:     linux-kernel@vger.kernel.org,
        Maxime Ripard <maxime.ripard@bootlin.com>
Subject: Re: [PATCH v2 2/2] drm/vc4: Disable V3D interactions if the v3d component didn't probe.
In-Reply-To: <c153b5bf62825718216dc54a2f79c291f84eb24f.camel@bootlin.com>
References: <20190401183559.3823-1-eric@anholt.net> <20190401183559.3823-2-eric@anholt.net> <c153b5bf62825718216dc54a2f79c291f84eb24f.camel@bootlin.com>
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Date:   Wed, 03 Apr 2019 12:15:29 -0700
Message-ID: <87bm1moq7i.fsf@anholt.net>
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Paul Kocialkowski <paul.kocialkowski@bootlin.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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