drm/i915: Handle fb offset and src coordinates for cursors
authorVille Syrjälä <ville.syrjala@linux.intel.com>
Mon, 27 Mar 2017 18:55:44 +0000 (21:55 +0300)
committerVille Syrjälä <ville.syrjala@linux.intel.com>
Wed, 10 May 2017 16:28:34 +0000 (19:28 +0300)
commit1e7b4fd8944e013a803af9bd44403e90b645ef5c
tree6ca9a96b061a32757b4388f242800d6f22da3354
parentfabac4840169217de95c8b6d64db2ddd27c192f8
drm/i915: Handle fb offset and src coordinates for cursors

The cursor plane doesn't have any kind of source offset register, so
the only form of panning possible is via a the base address register.
The alignment required by CURBASE ranges from 32B to 16KiB depending
on the platform. Let's make sure the user didn't ask for something
we can't do.

Obviously this is impossible to hit via the legacy cursor ioctl since
the src offsets are always 0, but via the plane/atomic ioctls the user
can ask for pretty much anything so we have to deal with this.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170327185546.2977-14-ville.syrjala@linux.intel.com
Reviewed-by: Imre Deak <imre.deak@intel.com>
drivers/gpu/drm/i915/intel_display.c