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Date: Thu, 03 Apr 2014 17:45:11 +0200 From: Sebastian Hesselbarth <sebastian.hesselbarth@...il.com> To: Alexander Holler <holler@...oftware.de>, Florian Fainelli <f.fainelli@...il.com> CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, netdev <netdev@...r.kernel.org>, Michal Simek <michal.simek@...inx.com>, stable <stable@...r.kernel.org> Subject: Re: [PATCH regression] net: phy: fix initialization (config_init) for Marvel 88E1116R PHYs On 04/03/2014 05:06 PM, Alexander Holler wrote: > Am 03.04.2014 10:49, schrieb Sebastian Hesselbarth: >> On 04/03/2014 09:17 AM, Alexander Holler wrote: >>> Am 03.04.2014 00:27, schrieb Sebastian Hesselbarth: >>>> On 04/03/2014 12:12 AM, Alexander Holler wrote: >>>>>> I am curious, how you determined above commit to be the cause of the >>>>>> regression you are seeing. Can you bisect, if you didn't already? >>>>> >>>>> There was no bisecting necessary. I've just looked at what changed in >>>>> mv643xx_eth since 3.13 and the first commit I've reverted was >>>>> already a >>>>> hit. Reading a bit source revealed the differences between the old >>>>> reset >>>>> and the newly used one and ended up with my patch (first try) and >>>>> was a >>>>> hit too. >>>> >>>> Honestly, your own fix changes a different driver than mv643xx_eth. >>> >>> It changes stuff which now (through the mentioned commit) gets used >>> through the change in mv643xx_eth. >> >> Sigh. You have proven youself that the commit isn't the root cause >> of the issue you are seeing. Nor is "fixing" 88e1116r init sequence >> a reasonable fix. > > Sorry, continuing this discussion doesn't make sense. You have the same > hw, so just try enabling netconsole with 3.14 and use dhcpcd from > userland (this does the final reset here which hangs. > > But don't suggest me (or insist on) a time consuming and totally useless > bisect when I already know what makes the problem to appear (100% > reliable here). I _suggest_ to use bisect, I don't _insist_. But for a patch that tackles an issue, knowing the offending patch is really good. Now that you revealed more input, it becomes more clear to me what is happening (although I have no clue, what netconsole really does to the eth/phy): - u-boot powers on the PHY - netconsole picks up the eth device and the PHY, drops it later - the PHY state machine powers off the now unused PHY (also introduced in between v3.13 and v3.14). - dhcp client ifup's the device and tries to reset the powered down PHY I already made a comment about the set POWERDOWN bit before, which you silently ignored. I will try to reproduce it and if I hit it, will do a bisect to find (and fix) the offending patch. > I have better ways to waste my time. Like writing workarounds instead of fixing bugs? Sebastian -- 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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