From: Siddharth Vadapalli <s-vadapalli@ti.com>
To: "Russell King (Oracle)" <linux@armlinux.org.uk>
Cc: <davem@davemloft.net>, <edumazet@google.com>, <kuba@kernel.org>,
<pabeni@redhat.com>, <robh+dt@kernel.org>,
<krzysztof.kozlowski@linaro.org>,
<krzysztof.kozlowski+dt@linaro.org>, <vladimir.oltean@nxp.com>,
<grygorii.strashko@ti.com>, <vigneshr@ti.com>, <nsekhar@ti.com>,
<netdev@vger.kernel.org>, <devicetree@vger.kernel.org>,
<linux-kernel@vger.kernel.org>,
<linux-arm-kernel@lists.infradead.org>, <kishon@ti.com>,
<s-vadapalli@ti.com>
Subject: Re: [PATCH 5/8] net: ethernet: ti: am65-cpsw: Add support for fixed-link configuration
Date: Thu, 15 Sep 2022 14:58:52 +0530 [thread overview]
Message-ID: <ab683d52-d469-35cf-b3b5-50c9edfc173b@ti.com> (raw)
In-Reply-To: <YyH8us424n3dyLYT@shell.armlinux.org.uk>
Hello Russell,
On 14/09/22 21:39, Russell King (Oracle) wrote:
> On Wed, Sep 14, 2022 at 03:20:50PM +0530, Siddharth Vadapalli wrote:
>> Check for fixed-link in am65_cpsw_nuss_mac_config() using struct
>> am65_cpsw_slave_data's phy_node property to obtain fwnode. Since
>> am65_cpsw_nuss_mac_link_up() is not invoked in fixed-link mode, perform
>> the relevant operations in am65_cpsw_nuss_mac_config() itself.
>
> Further to my other comments, you also fail to explain that, when in
> fixed-link SGMII mode, you _emulate_ being a PHY - which I deduce
> since you are sending the duplex setting and speed settings via the
> SGMII control word. Also, as SGMII was invented for a PHY to be able
> to communicate the media negotiation resolution to the MAC, SGMII
> defines that the PHY fills in the speed and duplex information in
> the control word to pass it to the MAC, and the MAC acknowledges this
> information. There is no need (and SGMII doesn't permit) the MAC to
> advertise what it's doing.
>
> Maybe this needs to be explained in the commit message?
I had tested SGMII fixed-link mode using a bootstrapped ethernet layer-1
PHY. Based on your clarification in the previous mails that there is an
issue with the fixed-link mode which I need to debug, I assume that what
you are referring to here also happens to be a consequence of that.
Please let me know if I have misunderstood what you meant to convey.
Regards,
Siddharth.
next prev parent reply other threads:[~2022-09-15 9:29 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-14 9:50 [PATCH 0/8] Add support for J721e CPSW9G and SGMII mode Siddharth Vadapalli
2022-09-14 9:50 ` [PATCH 1/8] dt-bindings: net: ti: k3-am654-cpsw-nuss: Update bindings for J721e CPSW9G Siddharth Vadapalli
2022-09-14 16:20 ` Rob Herring
2022-09-15 7:28 ` Siddharth Vadapalli
2022-09-14 16:23 ` Rob Herring
2022-09-15 7:40 ` Siddharth Vadapalli
2022-09-14 9:50 ` [PATCH 2/8] net: ethernet: ti: am65-cpsw: Add support for SERDES configuration Siddharth Vadapalli
2022-09-14 15:37 ` Russell King (Oracle)
2022-09-15 8:36 ` Siddharth Vadapalli
2022-09-14 9:50 ` [PATCH 3/8] net: ethernet: ti: am65-cpsw: Add mac control function Siddharth Vadapalli
2022-09-14 15:53 ` Russell King (Oracle)
2022-09-14 9:50 ` [PATCH 4/8] net: ethernet: ti: am65-cpsw: Add mac enable link function Siddharth Vadapalli
2022-09-14 15:54 ` Russell King (Oracle)
2022-09-14 9:50 ` [PATCH 5/8] net: ethernet: ti: am65-cpsw: Add support for fixed-link configuration Siddharth Vadapalli
2022-09-14 15:41 ` Russell King (Oracle)
2022-09-15 8:59 ` Siddharth Vadapalli
2022-09-14 16:09 ` Russell King (Oracle)
2022-09-15 9:28 ` Siddharth Vadapalli [this message]
2022-09-15 10:07 ` Russell King (Oracle)
2022-09-16 4:54 ` Siddharth Vadapalli
2022-09-16 7:20 ` Russell King (Oracle)
2022-09-16 9:03 ` Siddharth Vadapalli
2022-09-16 9:14 ` Russell King (Oracle)
2022-09-16 9:55 ` Siddharth Vadapalli
2022-09-14 9:50 ` [PATCH 6/8] net: ethernet: ti: am65-cpsw: Add support for SGMII mode for J7200 CPSW5G Siddharth Vadapalli
2022-09-14 15:44 ` Russell King (Oracle)
2022-09-15 9:35 ` Siddharth Vadapalli
2022-09-14 16:04 ` Russell King (Oracle)
2022-09-15 9:40 ` Siddharth Vadapalli
2022-09-14 9:50 ` [PATCH 7/8] net: ethernet: ti: am65-cpsw: Add support for J721e CPSW9G Siddharth Vadapalli
2022-09-14 9:50 ` [PATCH 8/8] net: ethernet: ti: am65-cpsw: Enable SGMII mode " Siddharth Vadapalli
2022-09-16 9:57 ` [PATCH 0/8] Add support for J721e CPSW9G and SGMII mode Krzysztof Kozlowski
2022-09-16 10:07 ` Siddharth Vadapalli
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