NV_PBUS_DEBUG_DUALHEAD_CTL  497 drivers/gpu/drm/nouveau/dispnv04/dfp.c 			nvif_mask(device, NV_PBUS_DEBUG_DUALHEAD_CTL, 1 << 31, 1 << 31);
NV_PBUS_DEBUG_DUALHEAD_CTL  500 drivers/gpu/drm/nouveau/dispnv04/dfp.c 			nvif_mask(device, NV_PBUS_DEBUG_DUALHEAD_CTL, 1 << 31, 0);