PA_SC_CLIPRECT_RULE  984 drivers/gpu/drm/radeon/evergreend.h #define PA_SC_CLIPRECT_RULE				0x2820C
PA_SC_CLIPRECT_RULE  398 drivers/gpu/drm/radeon/r600d.h #define PA_SC_CLIPRECT_RULE				0x2820c
PA_SC_CLIPRECT_RULE  486 drivers/gpu/drm/radeon/rv770d.h #define PA_SC_CLIPRECT_RULE				0x2820C