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Thu, 05 Mar 2026 11:46:54 -0800 (PST) Received: from oss.qualcomm.com ([202.46.23.25]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-8297e4fbc2fsm4546974b3a.54.2026.03.05.11.46.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 05 Mar 2026 11:46:53 -0800 (PST) Date: Fri, 6 Mar 2026 01:16:47 +0530 From: Mohd Ayaan Anwar To: "Russell King (Oracle)" Cc: Andrew Lunn , Alexandre Torgue , Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, netdev@vger.kernel.org, Paolo Abeni , Vinod Koul Subject: Re: [PATCH RFC net-next v2 0/7] net: stmmac: improve PCS support Message-ID: References: Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Authority-Analysis: v=2.4 cv=a/I9NESF c=1 sm=1 tr=0 ts=69a9ddb0 cx=c_pps a=WW5sKcV1LcKqjgzy2JUPuA==:117 a=ZePRamnt/+rB5gQjfz0u9A==:17 a=kj9zAlcOel0A:10 a=Yq5XynenixoA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=3WHJM1ZQz_JShphwDgj5:22 a=VIWiShEBZmvcmD2q97UA:9 a=Ds3QMCVJO9KgxsKD:21 a=CjuIK1q_8ugA:10 a=OpyuDcXvxspvyRM73sMx:22 X-Proofpoint-GUID: 5MKWWSuYzS0debgGol8P1KGTI7-qCAnl X-Proofpoint-ORIG-GUID: 5MKWWSuYzS0debgGol8P1KGTI7-qCAnl X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzA1MDE2NSBTYWx0ZWRfX2IDQFa3FQERG 7Enpt2B7XfByjuCTusK7VatGgmEg6EJ/IKX3Pkpv3U6Ecsb26TA6WjpC9ZePfLfVvve9JSFauXJ FJsmWSHK+o1X930EFutDayHDRPCf9ZYlvFlWPvfsEEgYh9F03l7CmGTbXWecUPOiJhg4CiKSmQK IaAhQ+5VpTg3Q1N1tOSUOVr0mdNH2lb+K+ysTcNoy0axktiVUN0wWh94uknXGPSK30JqpVQWOy9 X0XusTJAm9oVJB6UJMzpFCgBO1IV4jTmNM6krttYEqfDbcqKOcAqhFjNiwDTl6seGoqWvkvouOj I4hG7fAupU0If1JsfFaJiT6hRzukfYDsZwHhtFNhCv2Ye9y/lYI9F8NifvjxYe/vF4YN2B9TBLX RWo1ixDAJaI8sS1qS4g66p1+FF+kBoZ6hAtFKLaR8MrkPaPh0fEMsn5XbCo4d7xlZUkYxENZolO e7B9gW7qI9cRkR12VBQ== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-03-05_05,2026-03-04_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 priorityscore=1501 impostorscore=0 phishscore=0 bulkscore=0 suspectscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2602130000 definitions=main-2603050165 Hi Russell, On Wed, Mar 04, 2026 at 08:47:36AM +0000, Russell King (Oracle) wrote: > Resending this as the original RFC now conflicts with net-next. > > This series is the next of the three part series sorting out the PCS > support in stmmac, building on part 2, which was posted yesterday: > > net: stmmac: qcom-ethqos: further serdes reorganisation > > Similar patches have been posted previously. This series does away with > the common SerDes PHY support, instead using a flag to indicate whether > 2500Mbps mode is supported (STMMAC_FLAG_SERDES_SUPPORTS_2500M.) At this > time, I have no plans to resurect the common SerDes PHY support - the > generic PHY layer implementations are just too random to consider that, > and I certainly do not want the extra work of fixing that. > > I've also changed the last patch which prints warnings when qcom-ethqos > changes the PCS state - this will now indicate in a readable form > whether the ANE or SGMRAL bits have changed state, rather than having > to refer back to the definitions in the code or the databook. > > I am hoping that - subject to this working for qcom-ethqos - we can > drop this last patch in the final submission, along with the > dwmac_ctrl_ane() and ethqos_pcs_set_inband() functions and associated > definitions. This will also mean that stmmac will finally be driving > the PCS correctly from a phylink point of view. > Apologies for the delay in sharing test results. I had some board issues to work through. I applied your previous RFC series on top of the two qcom-ethqos/serdes cleanup series and have the following results to report for the QCS9100 Ride R3 board (AQR115C PHY): - Link up at 2.5G, 1G, and 100M is fine (phylink logs below). The PCS link takes a moment to stabilize, but after that it's stable. - No data path issues at these speeds either. - The warning ("PCS configuration changed from phylink by glue; ANE 0 -> 1") is observed when the link comes up at 1G/100M. - I did find one issue: the data path breaks when the link speed changes from 2.5G to 1G or 100M. Notably, this is not consistently reproducible, and the issue persists even after *dropping* this series and the two qcom-ethqos/serdes cleanup series, so it appears to be pre-existing. I am trying to debug this separately. Two additional data points: this patch series may have increased the reproducibility rate to near-always, and the data path recovers after an administrative interface down/up cycle. Logs for both the working and non-working cases are included below. - Since I still have to test on IQ9 EVK (QCA8081 PHY), I am planning to rebase to the net-next tip and apply the latest version of the series. I will share an update in a couple of days. Ayaan --- Logs 1. Boot up at 2.5G [ 10.895909] qcom-ethqos 23040000.ethernet eth1: PHY stmmac-0:08 uses interfaces 4,23,27, validating 23 [ 10.905494] qcom-ethqos 23040000.ethernet eth1: interface 23 (2500base-x) rate match pause supports 0-7,9,13-14,47 [ 10.905501] qcom-ethqos 23040000.ethernet eth1: PHY [stmmac-0:08] driver [Aquantia AQR115C] (irq=289) [ 10.905504] qcom-ethqos 23040000.ethernet eth1: phy: 2500base-x setting supported 00000000,00000000,00008000,000062ff advertising 00000000,00000000,00008000,000062ff [ 10.970145] qcom-ethqos 23040000.ethernet eth1: configuring for phy/2500base-x link mode [ 10.978487] qcom-ethqos 23040000.ethernet eth1: major config, requested phy/2500base-x [ 10.986630] qcom-ethqos 23040000.ethernet eth1: interface 2500base-x inband modes: pcs=01 phy=00 [ 10.986633] qcom-ethqos 23040000.ethernet eth1: major config, active phy/outband/2500base-x [ 10.986636] qcom-ethqos 23040000.ethernet eth1: phylink_mac_config: mode=phy/2500base-x/none adv=00000000,00000000,00000000,00000000 pause=00 [ 10.999279] qcom-ethqos 23040000.ethernet eth1: phy link down 2500base-x/1Gbps/Full/none/off/nolpi [ 11.524483] qcom-ethqos 23040000.ethernet eth1: Timeout accessing MAC_VLAN_Tag_Filter [ 15.571728] qcom-ethqos 23040000.ethernet eth1: phy link up 2500base-x/2.5Gbps/Full/none/rx/tx/nolpi [ 15.583871] qcom-ethqos 23040000.ethernet: PCS Link Up [ 15.592285] qcom-ethqos 23040000.ethernet eth1: Link is Up - 2.5Gbps/Full - flow control rx/tx [ 15.597500] qcom-ethqos 23040000.ethernet eth1: pcs link up 2. Boot up at 1G [ 10.225496] qcom-ethqos 23040000.ethernet eth1: PHY stmmac-0:08 uses interfaces 4,23,27, validating 23 [ 10.225507] qcom-ethqos 23040000.ethernet eth1: interface 23 (2500base-x) rate match pause supports 0-7,9,13-14,47 [ 10.225514] qcom-ethqos 23040000.ethernet eth1: PHY [stmmac-0:08] driver [Aquantia AQR115C] (irq=296) [ 10.225518] qcom-ethqos 23040000.ethernet eth1: phy: 2500base-x setting supported 00000000,00000000,00008000,000062ff advertising 00000000,00000000,00008000,000062ff [ 10.570643] qcom-ethqos 23040000.ethernet eth1: configuring for phy/2500base-x link mode [ 10.578994] qcom-ethqos 23040000.ethernet eth1: major config, requested phy/2500base-x [ 10.587126] qcom-ethqos 23040000.ethernet eth1: interface 2500base-x inband modes: pcs=01 phy=00 [ 10.596149] qcom-ethqos 23040000.ethernet eth1: major config, active phy/outband/2500base-x [ 10.604727] qcom-ethqos 23040000.ethernet eth1: phylink_mac_config: mode=phy/2500base-x/none adv=00000000,00000000,00000000,00000000 pause=00 [ 10.635960] qcom-ethqos 23040000.ethernet eth1: phy link down 2500base-x/Unknown/Unknown/none/off/nolpi [ 11.166068] qcom-ethqos 23040000.ethernet eth1: Timeout accessing MAC_VLAN_Tag_Filter [ 14.009935] qcom-ethqos 23040000.ethernet eth1: phy link up sgmii/1Gbps/Full/none/rx/tx/nolpi [ 14.021130] qcom-ethqos 23040000.ethernet eth1: major config, requested phy/sgmii [ 14.028849] qcom-ethqos 23040000.ethernet eth1: interface sgmii inband modes: pcs=03 phy=03 [ 14.037455] qcom-ethqos 23040000.ethernet eth1: major config, active phy/outband/sgmii [ 14.045597] qcom-ethqos 23040000.ethernet eth1: phylink_mac_config: mode=phy/sgmii/none adv=00000000,00000000,00000000,00000000 pause=03 [ 14.062429] dwmac: PCS configuration changed from phylink by glue, please report: 0x00040000 -> 0x00041000 [ 14.071296] qcom-ethqos 23040000.ethernet: PCS Link Up [ 14.072349] dwmac: ANE 0 -> 1 [ 14.077643] qcom-ethqos 23040000.ethernet eth1: pcs link up [ 14.086899] qcom-ethqos 23040000.ethernet: PCS Link Down [ 14.095640] qcom-ethqos 23040000.ethernet eth1: Link is Up - 1Gbps/Full - flow control rx/tx [ 14.101012] qcom-ethqos 23040000.ethernet eth1: pcs link down [ 14.104778] qcom-ethqos 23040000.ethernet: PCS ANE process completed [ 14.109740] qcom-ethqos 23040000.ethernet eth1: Link is Down [ 14.115609] qcom-ethqos 23040000.ethernet: PCS Link Up [ 14.115616] qcom-ethqos 23040000.ethernet eth1: pcs link up [ 14.143888] qcom-ethqos 23040000.ethernet: PCS ANE process completed [ 14.147725] qcom-ethqos 23040000.ethernet eth1: Link is Up - 1Gbps/Full - flow control rx/tx [ 14.154217] qcom-ethqos 23040000.ethernet: PCS Link Up [ 14.154225] qcom-ethqos 23040000.ethernet eth1: pcs link up 3. Moving from 2.5G to 1G : non-working scenario [463994.745225] qcom-ethqos 23040000.ethernet eth1: pcs link up [463994.760504] qcom-ethqos 23040000.ethernet eth1: Link is Up - 2.5Gbps/Full - flow control rx/tx **DHCP/pings work fine** **Link speed changed to 1G** [464006.855060] qcom-ethqos 23040000.ethernet eth1: phy link down 2500base-x/2.5Gbps/Full/none/rx/tx/nolpi [464006.864767] qcom-ethqos 23040000.ethernet eth1: Link is Down [464010.370790] qcom-ethqos 23040000.ethernet eth1: phy link up sgmii/1Gbps/Full/none/rx/tx/nolpi [464010.377197] qcom-ethqos 23040000.ethernet: PCS Link Down [464010.382018] qcom-ethqos 23040000.ethernet eth1: major config, requested phy/sgmii [464010.385204] qcom-ethqos 23040000.ethernet eth1: pcs link down [464010.399011] qcom-ethqos 23040000.ethernet eth1: interface sgmii inband modes: pcs=03 phy=03 [464010.407690] qcom-ethqos 23040000.ethernet eth1: major config, active phy/outband/sgmii [464010.415922] qcom-ethqos 23040000.ethernet eth1: phylink_mac_config: mode=phy/sgmii/none adv=00000000,00000000,00000000,00000000 pause=03 [464010.440494] dwmac: PCS configuration changed from phylink by glue, please report: 0x00040000 -> 0x00041000 [464010.440977] qcom-ethqos 23040000.ethernet: PCS Link Up [464010.450504] dwmac: ANE 0 -> 1 [464010.455870] qcom-ethqos 23040000.ethernet eth1: pcs link up [464010.465325] qcom-ethqos 23040000.ethernet eth1: Link is Up - 1Gbps/Full - flow control rx/tx [464010.465957] qcom-ethqos 23040000.ethernet: PCS Link Down [464010.474105] qcom-ethqos 23040000.ethernet eth1: Link is Down [464010.479633] qcom-ethqos 23040000.ethernet eth1: pcs link down [464010.500532] qcom-ethqos 23040000.ethernet eth1: Link is Up - 1Gbps/Full - flow control rx/tx 4. Moving from 2.5G to 1G : working scenario **Link speed changed to 1G** [ 123.351212] qcom-ethqos 23040000.ethernet eth1: phy link down 2500base-x/2.5Gbps/Full/none/rxtx/nolpi [ 123.360827] qcom-ethqos 23040000.ethernet eth1: Link is Down [ 126.742306] qcom-ethqos 23040000.ethernet eth1: phy link up sgmii/1Gbps/Full/none/rx/tx/nolpi [ 126.747557] qcom-ethqos 23040000.ethernet: PCS Link Down [ 126.756547] qcom-ethqos 23040000.ethernet eth1: pcs link down [ 126.762525] qcom-ethqos 23040000.ethernet eth1: major config, requested phy/sgmii [ 126.770227] qcom-ethqos 23040000.ethernet eth1: interface sgmii inband modes: pcs=03 phy=03 [ 126.778814] qcom-ethqos 23040000.ethernet eth1: major config, active phy/outband/sgmii [ 126.786958] qcom-ethqos 23040000.ethernet eth1: phylink_mac_config: mode=phy/sgmii/none adv=00000000,00000000,0000000,00000000 pause=03 [ 126.800656] qcom-ethqos 23040000.ethernet: PCS Link Up [ 126.805951] qcom-ethqos 23040000.ethernet eth1: pcs link up [ 126.812286] qcom-ethqos 23040000.ethernet: PCS Link Down [ 126.817748] qcom-ethqos 23040000.ethernet eth1: pcs link down [ 126.823693] qcom-ethqos 23040000.ethernet: PCS Link Up [ 126.828973] qcom-ethqos 23040000.ethernet eth1: pcs link up [ 126.837039] [DBG - SerDes update] ethqos_fix_mac_speed called with speed 1000, interface sgmii [ 126.846539] dwmac: PCS configuration changed from phylink by glue, please report: 0x00040000 -> 0x00041000 [ 126.856546] dwmac: ANE 0 -> 1 [ 126.860098] qcom-ethqos 23040000.ethernet eth1: Link is Up - 1Gbps/Full - flow control rx/tx [ 126.860554] qcom-ethqos 23040000.ethernet: PCS Link Down [ 126.868794] qcom-ethqos 23040000.ethernet eth1: Link is Down [ 126.874228] qcom-ethqos 23040000.ethernet eth1: pcs link down [ 126.874286] qcom-ethqos 23040000.ethernet: PCS ANE process completed [ 126.880062] [DBG - SerDes update] ethqos_fix_mac_speed called with speed 1000, interface sgmii [ 126.885958] qcom-ethqos 23040000.ethernet: PCS Link Up [ 126.885966] qcom-ethqos 23040000.ethernet eth1: pcs link up [ 126.892519] qcom-ethqos 23040000.ethernet eth1: Link is Up - 1Gbps/Full - flow control rx/tx [ 126.901370] qcom-ethqos 23040000.ethernet: PCS ANE process completed [ 126.927532] qcom-ethqos 23040000.ethernet: PCS Link Up [ 126.932822] qcom-ethqos 23040000.ethernet eth1: pcs link up