RADEON_VIPH_REG_ADDR
OUTREG( regs, RADEON_VIPH_REG_ADDR, (channel << 14) | address | 0x3000);
OUTREG( regs, RADEON_VIPH_REG_ADDR, (channel << 14) | (address & ~0x2000) );
OUTREG( regs, RADEON_VIPH_REG_ADDR,
OUTREG( regs, RADEON_VIPH_REG_ADDR, (channel << 14) | address | 0x2000 );