[igt-dev] [PATCH i-g-t] tests/fbdev: Add mmap readback subtest

[Chris Wilson]

Quoting Imre Deak (2020-11-17 14:43:56)
> Add a simple subtest checking that the mmap address we get for an FB
> corresponds to the content that we read back from the FB via the read
> syscall.

Please coordinate with https://patchwork.freedesktop.org/series/83955/
and decide what is the best approach since you both implement the same
test.
-Chris