PCI_TPH_CTRL_REQ_EN_MASK
reg &= ~PCI_TPH_CTRL_REQ_EN_MASK;
reg |= FIELD_PREP(PCI_TPH_CTRL_REQ_EN_MASK, req_type);
reg |= FIELD_PREP(PCI_TPH_CTRL_REQ_EN_MASK, pdev->tph_req_type);