[Bug 203201] New: [mgag200] Unable to do mmap call on mgadrmfb device - Returns -EINVAL

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=203201

            Bug ID: 203201
           Summary: [mgag200] Unable to do mmap call on mgadrmfb device -
                    Returns -EINVAL
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.4 LTS
          Hardware: Intel
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: olivier@bonhomme.io
        Regression: No

Hello dear kernel maintainers,

I'm trying to map memory on the frame buffer device fb0 provided by the mgag200
driver. However, that mmap call always returns -EINVAL code while the same
mmmap call works with other drivers (uvesafb for example).

After some investigations, I discovered that a patch which resolves that
problem has been produced by SuSe guys. The patch is available here :
https://lists.freedesktop.org/archives/dri-devel/2017-July/147650.html

I tested that patch on my 4.4.150 kernel and it resolved the problem.

I checked in the GIT kernel tree and it seems that this patch hasn't been
included in 4.4 branch nor in the current kernel branch while the same kind of
patch has been done for ast driver
(https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/drivers/gpu/drm/ast?h=linux-4.4.y&id=28fb4cb7fa6f63dc2fbdb5f2564dcbead8e3eee0)

It would be nice if that patch for mgag200 would be imported in the kernel
source tree.

Thanks

Regards,
Olivier Bonhomme

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