netdev - Re: [PATCH] net: smsc911x: If PHY doesn't have an interrupt then POLL

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Message-ID: <57607CD6.5040704@arm.com>
Date:	Tue, 14 Jun 2016 16:53:26 -0500
From:	Jeremy Linton <jeremy.linton@....com>
To:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	netdev@...r.kernel.org
Cc:	steve.glendinning@...well.net
Subject: Re: [PATCH] net: smsc911x: If PHY doesn't have an interrupt then POLL

On 06/14/2016 04:42 PM, Sergei Shtylyov wrote:
> On 06/15/2016 12:40 AM, Jeremy Linton wrote:
>
>>>>>> If the interrupt configuration isn't set and we are using the
>>>>>
>>>>>     It's never set, judging by the driver code.
>>>>>
>>>>>> internal phy, then we need to poll the phy to reliably detect
>>>>>> phy state changes.
>>>>>
>>>>>     What address your internal PHY is at? Mine is at 1, and things
>>>>> seem
>>>>> to work reliably after probing:
>>>>>
>>>>> SMSC LAN8700 18000000.etherne:01: attached PHY driver [SMSC LAN8700]
>>>>> (mii_bus:phy_addr=18000000.etherne:01, irq=-1)
>>>>>
>>>>>     I'm using the device tree on my board.
>>>>
>>>> Ok, I'm back on the machine, this is what mine says without that patch.
>>>>
>>>> SMSC LAN911x Internal PHY 18000000.etherne:01: attached PHY driver
>>>> [SMSC
>>>> LAN911x Internal PHY] (mii_bus:phy_addr=18000000.etherne:01, irq=0)
>>>
>>>     Hum, that's unexpected... things are probably more complex that I
>>> thought. Do you have extra patches to this driver by changce?
>>
>> No, the initial kernel where the problem was discovered is
>> 4.5.2-301.fc24.aarch64, but I built a mainline 4.6, and modprobed the
>> driver
>> with the same effect.
>>
>>
>> Although, now that I'm looking closer at phy_irq, I'm curious how it
>> works for
>> anyone else...
>
>     Does anything change when you comment out that memcpy()? It
> shouldn't probably...

	Well that should change the irq to PHY_POLL by default rather than the 
0's in the structure, which may be a better patch.