DC_IRQ_FILT_CTL
write_dc(par, DC_IRQ_FILT_CTL, 0);
filt = par->dc[DC_IRQ_FILT_CTL] | DC_IRQ_FILT_CTL_H_FILT_SEL;
write_dc(par, DC_IRQ_FILT_CTL, (filt & 0xffffff00) | i);
write_dc(par, DC_IRQ_FILT_CTL, (filt & 0xffffff00) | i);
filt = par->dc[DC_IRQ_FILT_CTL] | DC_IRQ_FILT_CTL_H_FILT_SEL;
write_dc(par, DC_IRQ_FILT_CTL, (filt & 0xffffff00) | i);
write_dc(par, DC_IRQ_FILT_CTL, (filt & 0xffffff00) | i);