[RFC] drm: implement DRM_IOCTL_MODE_SETROTATION

[Eric Anholt]

On Thu,  5 Jan 2012 14:16:23 -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.

So am I following this right, that these register bits are used to
communicate from one piece of software to another piece of software,
across the virtualization boundary?
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