netdev - Re: [PATCH v1] net/phy: fix DP83865 10 Mbps HDX loopback disable function

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Date:   Wed, 18 Sep 2019 18:40:03 +0300
From:   Peter Mamonov <pmamonov@...il.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Florian Fainelli <f.fainelli@...il.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] net/phy: fix DP83865 10 Mbps HDX loopback disable
 function

Hi Andrew,

On Wed, Sep 18, 2019 at 05:26:46PM +0200, Andrew Lunn wrote:
> On Wed, Sep 18, 2019 at 05:48:25PM +0300, Peter Mamonov wrote:
> > According to the DP83865 datasheet "The 10 Mbps HDX loopback can be
> > disabled in the expanded memory register 0x1C0.1." The driver erroneously
> > used bit 0 instead of bit 1.
> 
> Hi Peter
> 
> This is version 2, not 1. Or if you want to start counting from 0, it
> would be good to put v0 in your first patch :-)
> 
> It is also normal to put in the commit message what changed from the
> previous version.
> 
> This is a fix. So please add a Fixes: tag, with the hash of the commit
> which introduced the problem.
> 
> And since this is a fix, it should be against DaveM net tree, and you
> indicate this in the subject line with [PATCH net v3].

Thanks for the tips! Will submit new version soon.

Regards,
Peter

> 
> Thanks
> 	Andrew
> 
> > 
> > Signed-off-by: Peter Mamonov <pmamonov@...il.com>
> > ---
> >  drivers/net/phy/national.c | 9 ++++++---
> >  1 file changed, 6 insertions(+), 3 deletions(-)
> > 
> > diff --git a/drivers/net/phy/national.c b/drivers/net/phy/national.c
> > index 2addf1d3f619..3aa910b3dc89 100644
> > --- a/drivers/net/phy/national.c
> > +++ b/drivers/net/phy/national.c
> > @@ -110,14 +110,17 @@ static void ns_giga_speed_fallback(struct phy_device *phydev, int mode)
> >  
> >  static void ns_10_base_t_hdx_loopack(struct phy_device *phydev, int disable)
> >  {
> > +	u16 lb_dis = BIT(1);
> > +
> >  	if (disable)
> > -		ns_exp_write(phydev, 0x1c0, ns_exp_read(phydev, 0x1c0) | 1);
> > +		ns_exp_write(phydev, 0x1c0,
> > +			     ns_exp_read(phydev, 0x1c0) | lb_dis);
> >  	else
> >  		ns_exp_write(phydev, 0x1c0,
> > -			     ns_exp_read(phydev, 0x1c0) & 0xfffe);
> > +			     ns_exp_read(phydev, 0x1c0) & ~lb_dis);
> >  
> >  	pr_debug("10BASE-T HDX loopback %s\n",
> > -		 (ns_exp_read(phydev, 0x1c0) & 0x0001) ? "off" : "on");
> > +		 (ns_exp_read(phydev, 0x1c0) & lb_dis) ? "off" : "on");
> >  }
> >  
> >  static int ns_config_init(struct phy_device *phydev)
> > -- 
> > 2.23.0
> >