Hi Andrew,
> -----Original Message----- > From: Andrew Lunn [mailto:and...@lunn.ch] > Sent: Monday, January 09, 2017 5:57 PM > To: Karicheri, Muralidharan > Cc: netdev@vger.kernel.org; Kwok, WingMan > Subject: Re: Marvell Phy (1510) issue since v4.7 kernel > > On Mon, Jan 09, 2017 at 05:38:39PM -0500, Murali Karicheri wrote: > > Hello Charles-Antoine, Andrew, > > > > We have recently upgraded our kernel to v4.9 and started seeing an > issue > > on our Keystone EVMs (K2E/L) that uses Marvel Phy 1510. The issue is > that > > when we do a reboot command from the Linux console or do a SoC > reset, > > the DHCP times out at U-Boot due to Phy auto negotiation failure. > This works > > fine when the board is power cycled. > > I've seen similar before. What version of kernel are you upgrading > from? > > The problem i've had is that on shutdown/reboot, linux powers the PHYs > off. The uboot i have does not power them on again. Clearly a uboot > issue, it should not assume the PHYs are powered on. > > I work around this with a uboot command: > > mii write 1 0 0x3100 > > where the PHY is at address 1 on the bus. This writes to register 0, > and the import bit which needs setting to 0 is bit 11. > > If mii read shows bit 11 is set, you know there uboot did not power up > the PHY. > > Andrew Thanks for the suggestion. But when kernel is reboot into u-boot, "mii read 0 0" shows 0x1000, ie. bit 11 is 0, and still the phy auto-nego times out. The "mii read 0 0" shows the same value 0x1000 if we power cycle board and the phy auto-nego works fine. Could there be some other registers that need to be re-configured? We are upgrading from kernel v4.4 to v4.9. And the u-boot is 2016.05. Regards, WingMan
