head_a            187 drivers/gpu/drm/nouveau/nvkm/subdev/devinit/nv04.c 	bool head_a = (reg1 == 0x680508);
head_a            190 drivers/gpu/drm/nouveau/nvkm/subdev/devinit/nv04.c 		ramdac580 |= head_a ? 0x00000100 : 0x10000000;
head_a            192 drivers/gpu/drm/nouveau/nvkm/subdev/devinit/nv04.c 		ramdac580 &= head_a ? 0xfffffeff : 0xefffffff;