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Message-Id: <20151101.165151.1119828043753664843.davem@davemloft.net> Date: Sun, 01 Nov 2015 16:51:51 -0500 (EST) From: David Miller <davem@...emloft.net> To: p.fedin@...sung.com Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org, steve.glendinning@...well.net Subject: Re: [PATCH] net: smsc911x: Reset PHY during initialization From: Pavel Fedin <p.fedin@...sung.com> Date: Fri, 30 Oct 2015 10:06:19 +0300 > On certain hardware after software reboot the chip may get stuck and fail > to reinitialize during reset. This can be fixed by ensuring that PHY is > reset too. > > Old PHY resetting method required operational MDIO interface, therefore > the chip should have been already set up. In order to be able to function > during probe, it is changed to use PMT_CTRL register. > > The problem could be observed on SMDK5410 board. > > Signed-off-by: Pavel Fedin <p.fedin@...sung.com> I'm pretty sure this is going to break the PHY loopback test. This is such a tricky and fragile area to get right, therefore I want you to specifically guard any change in how PHY reset is done with tests against the specific chips that have the problem. Furthermore, I want you to test whether this has any negative effects on the PHY loopback test. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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