vc4: Detect working driver from cmdline

[Eric Anholt]

Stefan Wahren <stefan.wahren at i2se.com> writes:

> Hi,
> in order to improve kernelci.org results and avoid false positive cases like this [1], i suggested to also test for a working VC4 driver. In order to keep it simple, we should do it from userspace.
>
> My first idea was:
>
> test -d /sys/kernel/debug/dri/0 || echo "Error case"
>
> But maybe you have a better / more reliable solution?
>
> [1] - https://storage.kernelci.org/mainline/master/v4.17-rc5-69-g3acf4e395260/arm64/defconfig/lab-mhart/boot-bcm2837-rpi-3-b.html

GL testing involves running piglit and comparing to a previous run to
confirm no regressions, and we're building out the intel-gpu-tools
support for display testing now.  That's what you'd need to make sure
the driver actually works.  If you just want to make sure module probe
doesn't fail, I guess that test is fine (it would catch bugs we've seen
in the past).
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