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Date: Fri, 22 Aug 2014 10:46:25 -0700 (PDT) From: David Miller <davem@...emloft.net> To: b38611@...escale.com Cc: richardcochran@...il.com, netdev@...r.kernel.org Subject: Re: [PATCH v5 1/1] net: fec: ptp: avoid register access when ipg clock is disabled From: Fugang Duan <b38611@...escale.com> Date: Thu, 21 Aug 2014 17:09:38 +0800 > The current kernel hang on i.MX6SX with rootfs mount from MMC. > The root cause is that ptp uses a periodic timer to access enet register > even if ipg clock is disabled. > > FEC ptp driver start one period timer to read 1588 counter register in the > ptp init function that is called after FEC driver is probed. > > To save power, after FEC probe finish, FEC driver disable all clocks including > ipg clock that is needed for register access. > > i.MX5x, i.MX6q/dl/sl FEC register access don't cause system hang when ipg clock > is disabled, just return zero value. But for i.MX6sx SOC, it cause system hang. > > To avoid the issue, we need to check ptp clock status before ptp timer count access. > > Signed-off-by: Fugang Duan <B38611@...escale.com> Applied, thanks. -- 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
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