[PATCH v6 1/1] drm/i915: Add 180 degree primary plane rotation support

[Chris Wilson]

On Wed, Feb 12, 2014 at 12:22:00PM +0530, sagar.a.kamble at intel.com wrote:
> From: Sagar Kamble <sagar.a.kamble at intel.com>
> 
> Primary planes support 180 degree rotation. Expose the feature
> through rotation drm property.
> 
> v2: Calculating linear/tiled offsets based on pipe source width and
> height. Added 180 degree rotation support in ironlake_update_plane.
> 
> v3: Checking if CRTC is active before issueing update_plane. Added
> wait for vblank to make sure we dont overtake page flips. Disabling
> FBC since it does not work with rotated planes.
> 
> v4: Updated rotation checks for pending flips, fbc disable. Creating
> rotation property only for Gen4 onwards. Property resetting as part
> of lastclose.
> 
> v5: Resetting property in i915_driver_lastclose properly for planes
> and crtcs. Fixed linear offset calculation that was off by 1 w.r.t
> width in i9xx_update_plane and ironlake_update_plane. Removed tab
> based indentation and unnecessary braces in intel_crtc_set_property
> and intel_update_fbc. FBC and flip related checks should be done only
> for valid crtcs.
> 
> v6: Minor nits in FBC disable checks for comments in intel_crtc_set_property
> and positioning the disable code in intel_update_fbc.
> 
> Testcase: igt/kms_plane_rotation_crc

I particularly enjoyed how it reports an error after successfully
changing rotation modes. It could use with a few DRM_DEBUG_KMS() to
highlight what is hanppening.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre