PIPEDMC_INTERRUPT
tmp = intel_de_read(display, PIPEDMC_INTERRUPT(pipe));
intel_de_write(display, PIPEDMC_INTERRUPT(pipe), tmp);
intel_de_write(display, PIPEDMC_INTERRUPT(pipe), pipedmc_interrupt_mask(display));
intel_de_write(display, PIPEDMC_INTERRUPT(pipe), pipedmc_interrupt_mask(display));