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Message-ID: <5e113258-7cb4-e503-5009-e46cd3aa5bee@linux.intel.com> Date: Thu, 10 Aug 2023 17:52:10 +0800 From: Choong Yong Liang <yong.liang.choong@...ux.intel.com> To: Andrew Lunn <andrew@...n.ch> Cc: Rajneesh Bhardwaj <irenic.rajneesh@...il.com>, David E Box <david.e.box@...ux.intel.com>, Hans de Goede <hdegoede@...hat.com>, Mark Gross <markgross@...nel.org>, Jose Abreu <Jose.Abreu@...opsys.com>, Heiner Kallweit <hkallweit1@...il.com>, Russell King <linux@...linux.org.uk>, "David S . Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Marek BehĂșn <kabel@...nel.org>, Jean Delvare <jdelvare@...e.com>, Guenter Roeck <linux@...ck-us.net>, Giuseppe Cavallaro <peppe.cavallaro@...com>, Alexandre Torgue <alexandre.torgue@...s.st.com>, Jose Abreu <joabreu@...opsys.com>, Maxime Coquelin <mcoquelin.stm32@...il.com>, Richard Cochran <richardcochran@...il.com>, Philipp Zabel <p.zabel@...gutronix.de>, Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, Jesper Dangaard Brouer <hawk@...nel.org>, John Fastabend <john.fastabend@...il.com>, Wong Vee Khee <veekhee@...le.com>, Jon Hunter <jonathanh@...dia.com>, Jesse Brandeburg <jesse.brandeburg@...el.com>, Revanth Kumar Uppala <ruppala@...dia.com>, Shenwei Wang <shenwei.wang@....com>, Andrey Konovalov <andrey.konovalov@...aro.org>, Jochen Henneberg <jh@...neberg-systemdesign.com>, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com, linux-arm-kernel@...ts.infradead.org, platform-driver-x86@...r.kernel.org, linux-hwmon@...r.kernel.org, bpf@...r.kernel.org, Voon Wei Feng <weifeng.voon@...el.com>, Tan Tee Min <tee.min.tan@...ux.intel.com>, Michael Sit Wei Hong <michael.wei.hong.sit@...el.com>, Lai Peter Jun Ann <jun.ann.lai@...el.com> Subject: Re: [PATCH net-next v2 0/5] TSN auto negotiation between 1G and 2.5G On 4/8/2023 8:04 pm, Andrew Lunn wrote: > On Fri, Aug 04, 2023 at 04:45:22PM +0800, Choong Yong Liang wrote: >> Intel platformsâ integrated Gigabit Ethernet controllers support >> 2.5Gbps mode statically using BIOS programming. In the current >> implementation, the BIOS menu provides an option to select between >> 10/100/1000Mbps and 2.5Gbps modes. Based on the selection, the BIOS >> programs the Phase Lock Loop (PLL) registers. The BIOS also read the >> TSN lane registers from Flexible I/O Adapter (FIA) block and provided >> 10/100/1000Mbps/2.5Gbps information to the stmmac driver. But >> auto-negotiation between 10/100/1000Mbps and 2.5Gbps is not allowed. >> The new proposal is to support auto-negotiation between 10/100/1000Mbps >> and 2.5Gbps . Auto-negotiation between 10, 100, 1000Mbps will use >> in-band auto negotiation. Auto-negotiation between 10/100/1000Mbps and >> 2.5Gbps will work as the following proposed flow, the stmmac driver reads >> the PHY link status registers then identifies the negotiated speed. >> Based on the speed stmmac driver will identify TSN lane registers from >> FIA then send IPC command to the Power Management controller (PMC) >> through PMC driver/API. PMC will act as a proxy to programs the >> PLL registers. > > Have you considered using out of band for all link modes? You might > end up with a cleaner architecture, and not need any phylink/phylib > hacks. > > Andrew Hi Andrew, Thank you for your feedback. I will study the feasibility of the out-of-band (OOB) approach.
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