From: Andrew Lunn <andrew@lunn.ch>
To: Steen Hegelund <steen.hegelund@microchip.com>
Cc: Kishon Vijay Abraham I <kishon@ti.com>,
Vinod Koul <vkoul@kernel.org>,
linux-arm-kernel@lists.infradead.org,
Alexandre Belloni <alexandre.belloni@bootlin.com>,
Lars Povlsen <lars.povlsen@microchip.com>,
Bjarni Jonasson <bjarni.jonasson@microchip.com>,
Microchip UNG Driver List <UNGLinuxDriver@microchip.com>,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v9 3/4] phy: Add Sparx5 ethernet serdes PHY driver
Date: Thu, 10 Dec 2020 15:16:10 +0100 [thread overview]
Message-ID: <20201210141610.GG2638572@lunn.ch> (raw)
In-Reply-To: <20201210125706.saub7c2rarifhbx4@mchp-dev-shegelun>
> > So why are returning link up information?
>
> Yes that was a bit of a hijacking of the function. I will remove that.
> I also removed the dependency on this behaviour in the client driver in the
> meantime.
>
> I think a status function on the generic phy would be useful, but I will
> take that as separate issue.
In this context of an Ethernet SERDES, do you actually need it? You
would normally look at the PCS link status to determine if the link is
up. But it is useful debug information. If the PCS is down, but the
PHY indicates up, you can guess you have a protocol misconfiguration.
What exactly does link at this level mean? And thinking of the wider
uses of the PHY subsystem, what would link mean at this level for
SATA, PCIe, USB? Don't these all have some protocol level above
similar to Ethernet PCS which is the real determiner of link?
Andrew
WARNING: multiple messages have this Message-ID (diff)
From: Andrew Lunn <andrew@lunn.ch>
To: Steen Hegelund <steen.hegelund@microchip.com>
Cc: Bjarni Jonasson <bjarni.jonasson@microchip.com>,
Alexandre Belloni <alexandre.belloni@bootlin.com>,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
Kishon Vijay Abraham I <kishon@ti.com>,
Vinod Koul <vkoul@kernel.org>,
linux-arm-kernel@lists.infradead.org,
Microchip UNG Driver List <UNGLinuxDriver@microchip.com>,
Lars Povlsen <lars.povlsen@microchip.com>
Subject: Re: [PATCH v9 3/4] phy: Add Sparx5 ethernet serdes PHY driver
Date: Thu, 10 Dec 2020 15:16:10 +0100 [thread overview]
Message-ID: <20201210141610.GG2638572@lunn.ch> (raw)
In-Reply-To: <20201210125706.saub7c2rarifhbx4@mchp-dev-shegelun>
> > So why are returning link up information?
>
> Yes that was a bit of a hijacking of the function. I will remove that.
> I also removed the dependency on this behaviour in the client driver in the
> meantime.
>
> I think a status function on the generic phy would be useful, but I will
> take that as separate issue.
In this context of an Ethernet SERDES, do you actually need it? You
would normally look at the PCS link status to determine if the link is
up. But it is useful debug information. If the PCS is down, but the
PHY indicates up, you can guess you have a protocol misconfiguration.
What exactly does link at this level mean? And thinking of the wider
uses of the PHY subsystem, what would link mean at this level for
SATA, PCIe, USB? Don't these all have some protocol level above
similar to Ethernet PCS which is the real determiner of link?
Andrew
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2020-12-10 14:17 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-07 12:13 [PATCH v9 0/4] Adding the Sparx5 Serdes driver Steen Hegelund
2020-12-07 12:13 ` [PATCH v9 1/4] dt-bindings: phy: Add sparx5-serdes bindings Steen Hegelund
2020-12-07 18:24 ` Rob Herring
2020-12-07 12:13 ` [PATCH v9 2/4] phy: Add ethernet serdes configuration option Steen Hegelund
2020-12-07 12:13 ` [PATCH v9 3/4] phy: Add Sparx5 ethernet serdes PHY driver Steen Hegelund
2020-12-10 2:11 ` Andrew Lunn
2020-12-10 2:11 ` Andrew Lunn
2020-12-10 12:57 ` Steen Hegelund
2020-12-10 12:57 ` Steen Hegelund
2020-12-10 14:16 ` Andrew Lunn [this message]
2020-12-10 14:16 ` Andrew Lunn
2020-12-10 14:59 ` Steen Hegelund
2020-12-10 14:59 ` Steen Hegelund
2020-12-07 12:13 ` [PATCH v9 4/4] arm64: dts: sparx5: Add Sparx5 serdes driver node Steen Hegelund
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20201210141610.GG2638572@lunn.ch \
--to=andrew@lunn.ch \
--cc=UNGLinuxDriver@microchip.com \
--cc=alexandre.belloni@bootlin.com \
--cc=bjarni.jonasson@microchip.com \
--cc=kishon@ti.com \
--cc=lars.povlsen@microchip.com \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=netdev@vger.kernel.org \
--cc=steen.hegelund@microchip.com \
--cc=vkoul@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.