netdev - Re: [PATCH RFC net-next 3/4] net: mvneta: convert to phylink EEE implementation

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Message-ID: <ZINurNycA5yacMvq@corigine.com>
Date: Fri, 9 Jun 2023 20:25:48 +0200
From: Simon Horman <simon.horman@...igine.com>
To: "Russell King (Oracle)" <linux@...linux.org.uk>
Cc: Andrew Lunn <andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Marcin Wojtas <mw@...ihalf.com>,
	netdev@...r.kernel.org, Paolo Abeni <pabeni@...hat.com>,
	Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH RFC net-next 3/4] net: mvneta: convert to phylink EEE
 implementation

On Fri, Jun 09, 2023 at 03:31:28PM +0100, Russell King (Oracle) wrote:
> On Fri, Jun 09, 2023 at 04:02:09PM +0200, Simon Horman wrote:
> > On Fri, Jun 09, 2023 at 10:11:26AM +0100, Russell King (Oracle) wrote:
> > > Convert mvneta to use phylink's EEE implementation, which means we just
> > > need to implement the two methods for LPI control, and adding the
> > > initial configuration.
> > > 
> > > Disabling LPI requires clearing a single bit. Enabling LPI needs a full
> > > configuration of several values, as the timer values are dependent on
> > > the MAC operating speed.
> > > 
> > > Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
> > > ---
> > >  drivers/net/ethernet/marvell/mvneta.c | 95 +++++++++++++++++----------
> > >  1 file changed, 61 insertions(+), 34 deletions(-)
> > > 
> > > diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c
> > > index e2abc00d0472..c634ec5d3f9a 100644
> > > --- a/drivers/net/ethernet/marvell/mvneta.c
> > > +++ b/drivers/net/ethernet/marvell/mvneta.c
> > > @@ -284,8 +284,10 @@
> > >  					  MVNETA_TXQ_BUCKET_REFILL_PERIOD))
> > >  
> > >  #define MVNETA_LPI_CTRL_0                        0x2cc0
> > > +#define      MVNETA_LPI_CTRL_0_TS                0xff << 8
> > 
> > Hi Russell,
> > 
> > maybe GENMASK would be useful here. If not, perhaps (0xffUL << 8)
> 
> Why "unsigned long" when the variable we use it with is u32, which is
> defined as "unsigned int" ?

Fair point. What I actually wanted to ask is if the logic
that uses this works without parentheses. Probably I'm missing
something obvious and it does. But it looked odd to me.