netdev - Re: regression from: net: phy: marvell: Avoid unnecessary soft reset

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Message-ID: <cbb4b17b-a950-7929-4b19-96edecf2574e@electromag.com.au>
Date:   Wed, 20 Mar 2019 13:16:56 +0800
From:   Phil Reid <preid@...ctromag.com.au>
To:     Florian Fainelli <f.fainelli@...il.com>,
        liweihang <liweihang@...ilicon.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Cc:     Andrew Lunn <andrew@...n.ch>,
        "David S. Miller" <davem@...emloft.net>,
        "dongsheng.wang@...-semitech.com" <dongsheng.wang@...-semitech.com>,
        "cphealy@...il.com" <cphealy@...il.com>,
        "clemens.gruber@...ruber.com" <clemens.gruber@...ruber.com>,
        "hkallweit1@...il.com" <hkallweit1@...il.com>,
        "nbd@....name" <nbd@....name>,
        "harini.katakam@...inx.com" <harini.katakam@...inx.com>
Subject: Re: regression from: net: phy: marvell: Avoid unnecessary soft reset

On 20/03/2019 11:37 am, Florian Fainelli wrote:
> 
> 
> On 3/19/2019 7:34 PM, liweihang wrote:
>> Hi all,
>>
>> I've met a similar issue and sent an email to discuss about it before:
>> Question about setting speed and duplex failed after auto-negotiation disabled on marvell phy
>>
>> d6ab93364734 net: phy: marvell: Avoid unnecessary soft reset
>> I reverted this patch and the auto-negotiation works ok.
>>
>> Florian, could you please read my previous email and give me some advice?
> 
> If you can copy the patch author on that email the next time that will
> help expedite things.
> 
> So the problem seems to come from the fact that unless the BCMR_RESET
> bit is written, then m88e1121_config_aneg_rgmii_delays() has no effect,
> does that sound like what you are observing?
> 
> Does the following work for you (Phil and yourself)?
> 
> diff --git a/drivers/net/phy/marvell.c b/drivers/net/phy/marvell.c
> index 3ccba37bd6dd..6a1ea4c2042a 100644
> --- a/drivers/net/phy/marvell.c
> +++ b/drivers/net/phy/marvell.c
> @@ -448,6 +448,10 @@ static int m88e1121_config_aneg(struct phy_device
> *phydev)
>                  err = m88e1121_config_aneg_rgmii_delays(phydev);
>                  if (err < 0)
>                          return err;
> +
> +               err = genphy_soft_reset(phydev);
> +               if (err < 0)
> +                       return err;
>          }
> 
>          err = marvell_set_polarity(phydev, phydev->mdix_ctrl);
> 


G'day Florian,

Nope that didn't work for me.
But based on that patch and liweihang email I found the following works for me:

diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index 46c8672..de71aef 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -1827,7 +1827,13 @@ int genphy_soft_reset(struct phy_device *phydev)
  {
         int ret;

-       ret = phy_write(phydev, MII_BMCR, BMCR_RESET);
+       phydev_err(phydev, "genphy_soft_reset");
+
+       ret = phy_read(phydev, MII_BMCR);
+       if (ret < 0)
+               return ret;
+
+       ret = phy_write(phydev, MII_BMCR, ret | BMCR_RESET);
         if (ret < 0)
                 return ret;








-- 
Regards
Phil