From: Antoine Tenart <antoine.tenart@bootlin.com>
To: Andrew Lunn <andrew@lunn.ch>
Cc: davem@davemloft.net, f.fainelli@gmail.com, hkallweit1@gmail.com,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
alexandre.belloni@bootlin.com, thomas.petazzoni@bootlin.com,
allan.nielsen@microchip.com
Subject: Re: [PATCH net-next 0/4] net: phy: mscc-miim: reduce waiting time between MDIO transactions
Date: Wed, 27 May 2020 09:00:59 +0200 [thread overview]
Message-ID: <159056285904.265465.1821646548974311512@kwain> (raw)
In-Reply-To: <20200526170100.GM768009@lunn.ch>
Hi Andrew,
Quoting Andrew Lunn (2020-05-26 19:01:00)
> On Tue, May 26, 2020 at 06:22:52PM +0200, Antoine Tenart wrote:
> >
> > This series aims at reducing the waiting time between MDIO transactions
> > when using the MSCC MIIM MDIO controller.
>
> There are a couple of other things you can look at:
>
> Can you disable the pre-amble on the MDIO transaction. It requires
> that both the bus master and all devices on the bus support it, but
> when it is usable, you half the number of bits sent over the wire.
>
> Can you control the frequency of MDC? 802.3 says 2.5MHz, but many
> devices support higher speeds. Again, you need all devices on the bus
> to support the speed.
>
> When accessing raw TDR data for cable tests i also have a lot of PHY
> accesses. I implemented both of these for the FEC MDIO bus, and made
> it a lot faster.
Thanks for the tips!
Antoine
--
Antoine Ténart, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
next prev parent reply other threads:[~2020-05-27 7:01 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-26 16:22 [PATCH net-next 0/4] net: phy: mscc-miim: reduce waiting time between MDIO transactions Antoine Tenart
2020-05-26 16:22 ` [PATCH net-next 1/4] net: phy: mscc-miim: use more reasonable delays Antoine Tenart
2020-05-26 21:04 ` Alexandre Belloni
2020-05-26 21:19 ` Florian Fainelli
2020-05-26 16:22 ` [PATCH net-next 2/4] net: phy: mscc-miim: remove redundant timeout check Antoine Tenart
2020-05-26 21:04 ` Alexandre Belloni
2020-05-26 21:19 ` Florian Fainelli
2020-05-26 16:22 ` [PATCH net-next 3/4] net: phy: mscc-miim: improve waiting logic Antoine Tenart
2020-05-26 21:07 ` Alexandre Belloni
2020-05-26 21:21 ` Florian Fainelli
2020-05-26 16:22 ` [PATCH net-next 4/4] net: phy: mscc-miim: read poll when high resolution timers are disabled Antoine Tenart
2020-05-26 21:22 ` Florian Fainelli
2020-05-26 22:01 ` Andrew Lunn
2020-05-26 22:05 ` Florian Fainelli
2020-05-26 17:01 ` [PATCH net-next 0/4] net: phy: mscc-miim: reduce waiting time between MDIO transactions Andrew Lunn
2020-05-27 7:00 ` Antoine Tenart [this message]
2020-05-26 22:34 ` David Miller
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