[PATCH v4 00/11] Enabling 180 degree rotation for sprite and crtc planes

[Ville Syrjälä]

On Mon, Feb 10, 2014 at 10:41:30AM +0000, One Thousand Gnomes wrote:
> On Fri,  7 Feb 2014 19:15:05 +0530
> sagar.a.kamble at intel.com wrote:
> 
> > From: Sagar Kamble <sagar.a.kamble at intel.com>
> > 
> > These patches will enable 180 degree rotation for CRTC and Sprite planes.
> > Changelog:
> > 1. drm/i915: Add 180 degree primary plane rotation support
> > Addressed review comments for CRTC rotation from FBC, page flip, CRTC active/
> > inactive perspective.
> 
> Does this mean it should also handle horizontal mirroring in
> hardware (180° rotate, and scan lines backwards combined) ?

Our hardware doesn't support mirroring (h or v). Well, unless you
count h+v mirroring since that's 180 degree rotation :)

Anyways IIRC the old video overlay (present on gen2-4) was the only plane
to ever support mirroring on Intel hardware. With all other planes we're
limited to 0 and 180 degree rotation.

-- 
Ville Syrjälä
Intel OTC