linux-kernel - Re: [PATCH] net: ethernet: fec: Add missing SPEED

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Date:   Sat, 20 Oct 2018 21:26:03 +0200
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        LABBE Corentin <clabbe@...libre.com>, davem@...emloft.net,
        fugang.duan@....com, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH] net: ethernet: fec: Add missing SPEED_

On 20.10.2018 20:59, Andrew Lunn wrote:
>> I dare to dispute here ;) Above code snippet from phy_probe() will
>> (try to) set also SUPPORTED_Asym_Pause, because phydrv->features
>> doesn't include any of the two pause flags.
>> The statement in bcm63xx_config_init you refer to seems to be a
>> no-op to me therefore.
>>
>> I'd say the correct way is to change the PHY config like this:
>> .features	= PHY_BASIC_FEATURES | SUPPORTED_Pause;
>> It's exactly the use case the code snippet above covers.
> 
> Yes, you are correct.
> 
> But it is no longer possible to just do PHY_BASIC_FEATURES |
> SUPPORTED_Pause because .features is no loner a u32 but a linux
> bitmap.
> 
Ahh, missed that.

> We need to keep the same idea, allow the PHY driver to indicate it
> supports a subset of Pause, and if not, enable pause by default.
> 
Could the PHY driver define its own bitmap instead of pointing to
one of the predefined ones?

> Maybe the easiest way is to move this chunk of code to after the probe
> function is called.
> 
> 	 Andrew
>