[PATCH 1/2] drm/hyperv: Add DRM driver for hyperv synthetic video device

[Gerd Hoffmann]

  Hi,

> > It's not possible to do page flip with this virtual device. The call to
> > SYNTHVID_VRAM_LOCATION is only honoured once. So unfortunately need to
> > use SHMEM helpers.
> 
> I was thinking about using struct video_output_situation.vram_offset; in
> case you want to tinker with that. There's a comment in the patch that
> vram_offset should always be 0. But this comment seems incorrect for devices
> with more than one output.

Where does the comment come from?  fbdev drivers support a single
framebuffer only so for a fbdev driver it makes sense to set the offset
to 0 unconditionally.  With drm you probably can handle things
differently ...

take care,
  Gerd