| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Sun, 07 Jun 2015 15:31:04 -0700 (PDT) From: David Miller <davem@...emloft.net> To: B38611@...escale.com Cc: richardcochran@...il.com, netdev@...r.kernel.org, B20596@...escale.com Subject: Re: [PATCH net-next 1/1] net: fec: ptp: correct the ENET_ATCOR value From: Fugang Duan <B38611@...escale.com> Date: Fri, 5 Jun 2015 17:22:08 +0800 > From: Fugang Duan <b38611@...escale.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 <B38611@...escale.com> > Signed-off-by: Frank Li <Frank.Li@...escale.com> Applied, thank you. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Powered by blists - more mailing lists