i915: Dealing with 90° rotated display ?

[Hans de Goede]

Hi Jani,

As discussed here:

https://bugs.freedesktop.org/show_bug.cgi?id=94894

I've a mini-laptop which uses a phone-screen,
so the native orientation of the screen is portrait,
where as for a clam-shell device one wants it to
be landscape. Ideally there would be a flag somewhere
to tell the i915 driver that the panel is mounted
90° rotated in its bezel and have the i915 driver
apply that rotation on top of whatever rotation
userspace requests.

So question is there already a place (variable) in
the i915 driver where one can set such a rotation
offset to apply on top of what userspace requests ?

If not do you have any idea how feasible adding one
would be and can you give me a few pointers / hints
where to start with such a thing ?

Regards,

Hans