From: Andrew Lunn <andrew@lunn.ch>
To: David Laight <David.Laight@ACULAB.COM>
Cc: Florian Fainelli <f.fainelli@gmail.com>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
"zefir.kurtisi@neratec.com" <zefir.kurtisi@neratec.com>,
Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>,
Wingman Kwok <w-kwok2@ti.com>,
Murali Karicheri <m-karicheri2@ti.com>,
Vivien Didelot <vivien.didelot@savoirfairelinux.com>,
"David S. Miller" <davem@davemloft.net>,
Philippe Reynes <tremyfr@gmail.com>,
Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>,
Jisheng Zhang <jszhang@marvell.com>,
Jarod Wilson <jarod@redhat.com>,
open list <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH net-next 4/4] net: dsa: Do not clobber PHY link outside of state machine
Date: Tue, 7 Feb 2017 14:14:40 +0100 [thread overview]
Message-ID: <20170207131440.GF31560@lunn.ch> (raw)
In-Reply-To: <063D6719AE5E284EB5DD2968C1650D6DB027DB40@AcuExch.aculab.com>
> Related is that polling the phy status every second can be bad news for
> system latency.
> Typically it involves bit-bashing an interface with spin-delays to
> meet the slow timings (with extra delays to allow for posted writes).
> An alternative would be to do a very slow bit-bang on each timer tick,
> this would need to be sped up and finished before any other actions.
Or just use PHY interrupts. That completely stops the MDIO polling.
Andrew
next prev parent reply other threads:[~2017-02-07 13:14 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-06 23:55 [PATCH net-next 0/4] net: Incorrect use of phy_read_status() Florian Fainelli
2017-02-06 23:55 ` [PATCH net-next 1/4] net: mv643xx_eth: Do not clobber PHY link outside of state machine Florian Fainelli
2017-02-07 0:13 ` Andrew Lunn
2017-02-06 23:55 ` [PATCH net-next 2/4] net: pxa168_eth: " Florian Fainelli
2017-02-06 23:55 ` [PATCH net-next 3/4] net: netcp: " Florian Fainelli
2017-02-06 23:55 ` [PATCH net-next 4/4] net: dsa: " Florian Fainelli
2017-02-07 0:11 ` Andrew Lunn
2017-02-07 11:42 ` David Laight
2017-02-07 13:14 ` Andrew Lunn [this message]
2017-02-07 18:48 ` [PATCH net-next 0/4] net: Incorrect use of phy_read_status() David Miller
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