netdev - Re: [PATCH] lan78xx: Don't reset the interface on open

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Message-ID: <dc7f30e2-624c-17d8-911b-d20ce96c2652@raspberrypi.org>
Date:   Tue, 10 Apr 2018 15:33:55 +0100
From:   Phil Elwell <phil@...pberrypi.org>
To:     Nisar.Sayed@...rochip.com, Woojung.Huh@...rochip.com,
        UNGLinuxDriver@...rochip.com, agraf@...e.de, tbogendoerfer@...e.de,
        netdev@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] lan78xx: Don't reset the interface on open

Hi Nisar,

On 10/04/2018 15:16, Nisar.Sayed@...rochip.com wrote:
> Thanks Phil, for identifying the issues.
> 
>> -	ret = lan78xx_reset(dev);
>> -	if (ret < 0)
>> -		goto done;
>> -
>>  	phy_start(net->phydev);
>>
>>  	netif_dbg(dev, ifup, dev->net, "phy initialised successfully");
>> --
> 
> You may need to start the interrupts before "phy_start" instead of suppressing call to "lan78xx_reset".
> 
> +             if (dev->domain_data.phyirq > 0)
> +                             phy_start_interrupts(dev->net->phydev);

Shouldn't phy_connect_direct, called from lan78xx_phy_init, already have enabled interrupts for us?

This patch addresses two problems - time wasted by renegotiating the link after the reset and the
missed interrupt - and I'd like both to be fixed. Unless you can come up with a good reason for
performing the reset from the open handler I think it should be removed.

Phil