netdev - Re: [PATCH 10/19] usbnet: smsc95xx: Replace smsc95xx_mdio_read() with phy

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Date:   Fri, 4 Jan 2019 15:58:13 +0100
From:   Marek Vasut <marex@...x.de>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     netdev@...r.kernel.org, "David S . Miller" <davem@...emloft.net>,
        Nisar Sayed <Nisar.Sayed@...rochip.com>,
        Woojung Huh <Woojung.Huh@...rochip.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        linux-usb@...r.kernel.org
Subject: Re: [PATCH 10/19] usbnet: smsc95xx: Replace smsc95xx_mdio_read() with
 phy_read()

On 1/4/19 2:24 PM, Andrew Lunn wrote:
>>> All this crossover code should be moved into the PHY driver.
>>
>> Fine, this can be done in a subsequent patch though, right ? I'd like to
>> keep the changes small, so if something breaks, it could be bisected easily.
> 
> Hi Marek

Hi,

> The problem is, do you have a regression because of the changes you
> made here, or because you have two things controlling the PHY, the MAC
> driver and the PHY driver, which are not coordinating?
> 
> I don't know if you can do a piecemeal conversation like this. I don't
> remember anybody else doing anything like this before.

I'd prefer that.

> What you can do piecemeal is add new functionality to the existing PHY
> driver. If you break the PHY driver we can then bisect it to find out
> which change broke it. Once the PHY driver has everything you need,
> then swap the MAC driver to use phylib.

I wonder, if I use the phylib functions instead of the ad-hoc ones in
the MAC driver, is there still a problem with synchronization ?

-- 
Best regards,
Marek Vasut