PMCR_PMEN
tmp &= ~(PMCR_PMM_MASK | PMCR_PMEN);
__raw_writew(hwc->config | PMCR_PMEN | PMCR_PMST, PMCR(idx));
__raw_writew(__raw_readw(PMCR(i)) & ~PMCR_PMEN, PMCR(i));
__raw_writew(__raw_readw(PMCR(i)) | PMCR_PMEN, PMCR(i));