PCH_R_BAR_SCMD
pch->ps_init_scmd = pchsmbus_read8(pch, PCH_R_BAR_SCMD);
pchsmbus_write8(pch, PCH_R_BAR_SCMD, 0);
pchsmbus_write8(pch, PCH_R_BAR_SCMD, pch->ps_init_scmd);