linux-kernel - Re: [PATCH net-next] net: phy: micrel: Add Fast link failure support for lan8842

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Message-ID: <20250916070700.qxhnjwy4r3brvdys@DEN-DL-M31836.microchip.com>
Date: Tue, 16 Sep 2025 09:07:00 +0200
From: Horatiu Vultur <horatiu.vultur@...rochip.com>
To: "Russell King (Oracle)" <linux@...linux.org.uk>
CC: <andrew@...n.ch>, <hkallweit1@...il.com>, <davem@...emloft.net>,
	<edumazet@...gle.com>, <kuba@...nel.org>, <pabeni@...hat.com>,
	<netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next] net: phy: micrel: Add Fast link failure support
 for lan8842

The 09/15/2025 13:01, Russell King (Oracle) wrote:

Hi Russell,

> 
> On Mon, Sep 15, 2025 at 11:11:49AM +0200, Horatiu Vultur wrote:
> > +static int lan8842_set_fast_down(struct phy_device *phydev, const u8 *msecs)
> > +{
> > +     if (*msecs == ETHTOOL_PHY_FAST_LINK_DOWN_ON)
> > +             return lanphy_modify_page_reg(phydev, LAN8814_PAGE_PCS,
> > +                                           LAN8842_FLF,
> > +                                           LAN8842_FLF_ENA |
> > +                                           LAN8842_FLF_ENA_LINK_DOWN,
> > +                                           LAN8842_FLF_ENA |
> > +                                           LAN8842_FLF_ENA_LINK_DOWN);
> > +
> > +     if (*msecs == ETHTOOL_PHY_FAST_LINK_DOWN_OFF)
> > +             return lanphy_modify_page_reg(phydev, LAN8814_PAGE_PCS,
> > +                                           LAN8842_FLF,
> > +                                           LAN8842_FLF_ENA |
> > +                                           LAN8842_FLF_ENA_LINK_DOWN, 0);
> 
> Would this be more readable?
> 
>         u16 flf;
> 
>         switch (*msecs) {
>         case ETHTOOL_PHY_FAST_LINK_DOWN_OFF:
>                 flf = 0;
>                 break;
> 
>         case ETHTOOL_PHY_FAST_LINK_DOWN_ON:
>                 flf = LAN8842_FLF_ENA | LAN8842_FLF_ENA_LINK_DOWN;
>                 break;
> 
>         default:
>                 return -EINVAL;
>         }
> 
>         return lanphy_modify_page_reg(phydev, LAN8814_PAGE_PCS,
>                                       LAN8842_FLF,
>                                       LAN8842_FLF_ENA |
>                                       LAN8842_FLF_ENA_LINK_DOWN, flf);

Yes, I think it looks nicer.
I will update this in the next version.

> 
> --
> RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
> FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!

-- 
/Horatiu