No functional changes.
v2 (Paulo): Rebase.
v3: Accept Daniel's suggestions:
* remove unclear and duplicated explanation.
* remove marketing like doc and replace by a simple one.
* remove bdw_fbc_sw_flush documentation.
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>