PROT_ADDR3
saa7146_write(dev, PROT_ADDR3, dma_addr+4096);
saa7146_write(dev, PROT_ADDR3, budget->buffer_size);
saa7146_write(dev, PROT_ADDR3, TS_WIDTH * TS_HEIGHT);
saa7146_write(dev, PROT_ADDR3, TS_WIDTH * TS_HEIGHT);