From: Fugang Duan <b38...@freescale.com> Date: Fri, 5 Jun 2015 17:22:08 +0800
> From: Fugang Duan <b38...@freescale.com> > > The current driver adjust freq formula is: > fe * diff = ppb * pc > Note: > fe: ENET ref clock frequency in Hz > diff = inc_corr - inc: difference between default increment and correction > increment > ppb: parts per billion adjustment from base > pc: correction period (in number of fe clock cycles) > > The correction increment will be used after N cycles of regular increments, > not every N cycles (with N being the correction period). For example, set > ENET_ATCOR=4, > INC=8, INC_CORR=9, there will be 4 increments of 8 (ENET_ATINC[INC]) , > followed by 1 > increment of 9 (ENET_ATINC[INC_CORR]). > > So, the correct formula is: > fe * diff = ppb * (pc + 1) > > For ENET_ATCOR, a value 0 disables the correction counter and no corrections > occur. > So base on the origin formula, set pc = pc > 1 ? pc - 1 : pc. > > Signed-off-by: Fugang Duan <b38...@freescale.com> > Signed-off-by: Frank Li <frank...@freescale.com> Applied, thank you. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
