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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Choong Yong Liang , Bartosz Golaszewski , Russell King , linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH net 2/2] net: stmmac: qcom-ethqos: advertise supported SerDes interfaces Message-ID: References: <97924d2f-45f9-44d5-b482-97fcbb70abdc@bootlin.com> <3bdf2ecc-9dd1-428c-8841-36b1f19916e7@bootlin.com> Precedence: bulk X-Mailing-List: linux-kernel@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: <3bdf2ecc-9dd1-428c-8841-36b1f19916e7@bootlin.com> X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTE3MDIyNyBTYWx0ZWRfX/HIzRDKpNg5d rikbT8KHvENH11ZUdtaKNaLZbrz6ptKBVGIsAJR8dM9AdItVkeWgeIB6K65gg39Ncy66n5+wlbr loJW6/Q2a7c48JWRwkuJ+8OXPIVU6jNyGuhJ04Ae3BxvqbWiW8h0i4lZmQQYD/jAEd+/t1sEZMz gJj75oFR3H04zljQcvWz5G6agIXa9V4rfTBlsYwCtQmLwCp3L0D7KOOCXCjfdMyqLieJ6J8DCP1 CpdDKRFnODDSuVpTgtGuEUK0XQJKN9EWFEvUgyLqHZcKyfUKZ/CRSBph2Uc/aKpeLP7EHtTXCKd TDEhg2jR/yxBZsalexLMHLBRD7ttCOV0UoIrA34kiaYzbQsIMjh8PU0Z9sn8T0yNJ7wRxMDsC0D vHVyhY4ylCMobbrZWGvrp4Eil2vbw2MYkiFHOPqYk39ceytp7RebhK5kmBDYGWs46G2R0/P7boV Lmd3o1+KIFBbNQLqpbg== X-Proofpoint-GUID: 4B3FMIGOPYvC1KTkQbtEw4eswMSzcbpJ X-Proofpoint-ORIG-GUID: 4B3FMIGOPYvC1KTkQbtEw4eswMSzcbpJ X-Proofpoint-Spam-Info: AW1haW4tMjYwOTE3MDIyNyBTYWx0ZWRfXzolrxp6OJ0J7 OmBguBKu12C6YK+Qa476Pnp99pfD9Jo+Stz+XrNP1agqGUWesJeti7WosxiCz8xNg9PKvdXjy+o Jv6rCDCwrqyR2X15eANqKZi7BNBJR8Y= X-Authority-Analysis: v=2.4 cv=Y/VtIReN c=1 sm=1 tr=0 ts=6aac0e7e cx=c_pps a=IZJwPbhc+fLeJZngyXXI0A==:117 a=ZePRamnt/+rB5gQjfz0u9A==:17 a=kj9zAlcOel0A:10 a=VdqzKS8jKosA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=rJkE3RaqiGZ5pbrm-msn:22 a=aHOOhSd_e6fbb9z57_EA:9 a=CjuIK1q_8ugA:10 a=uG9DUKGECoFWVXl0Dc02:22 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-09-17_03,2026-09-16_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 bulkscore=0 clxscore=1015 priorityscore=1501 malwarescore=0 suspectscore=0 spamscore=0 adultscore=0 phishscore=0 impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2609040000 definitions=main-2609170227 On Thu, Sep 17, 2026 at 07:36:42AM +0200, Maxime Chevallier wrote: > On 9/17/26 06:29, Thomas Karpiniec wrote: > > This POC did show that STMMAC_FLAG_SERDES_SUPPORTS_2500M enabled phylink to configure the integrated PCS for 2500BASE-X and a 2.5 Gbps link came up with no apparent issues. > > Maybe the blind spot is inband aneg. Mohd, you were quite involved in > this, do you remember where we stand on that front ? > That sounds about right. Let me go through the older emails and the logs I had captured at the time to jog my memory. Thomas, it would be useful to know if switching between 1G and 2.5G causes any PCS instability. I remember that particular test case causing a lot of SerDes link flapping. Note that I was testing the QCS9100 board which has the AQR115C PHY (and due to its rate matching capabilities, phylink presents all speeds by default, unlike QCA8081). In parallel, I will try to test out boards with both of these PHYs as well. Ayaan