[RFC] drm: implement DRM_IOCTL_MODE_SETROTATION

[Daniel Vetter]

On Thu, Jan 05, 2012 at 02:16:23PM -0200, przanoni at gmail.com wrote:
> From: Paulo Zanoni <paulo.r.zanoni at intel.com>
> 
> This ioctl is used to signal the drivers that the screen is rotated,
> not to make the drivers rotate the screen.
>  - add a driver-specific "rotation_set" function
>  - implement Intel's rotation_set by setting the right values to the
>    PIPECONF registers.
> 
> The idea is that when user-space does rotation, it can call this ioctl
> to inform the Kernel that we have a rotation. This feature is needed
> by the KVMr feature of VPro.
> 
> Signed-off-by: Paulo Zanoni <paulo.r.zanoni at intel.com>

Quick comments before I dig into this:
- Please post at least a link to the userspace patches, so that it's
  possible to check how this all fits together
- Please separate the generic infrastructre in drm from the changes to
  support this in i915. I know, this is a rather small feature, but still.

Cheers, Daniel
-- 
Daniel Vetter
Mail: daniel at ffwll.ch
Mobile: +41 (0)79 365 57 48