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[83.233.130.25]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-6aab38b2fc5sm2488739a12.27.2026.09.23.14.57.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 23 Sep 2026 14:57:50 -0700 (PDT) From: Yongzhao Chen To: Andrew Lunn Cc: netdev@vger.kernel.org, Vladimir Oltean , Christian Marangi , Heiner Kallweit , Russell King , Florian Fainelli , Jonas Gorski , Woojung Huh , UNGLinuxDriver@microchip.com, Ziyang Huang , Jakub Kicinski , Paolo Abeni , Simon Horman Subject: Re: [RFC PATCH net-next v2 5/5] net: phy: qca83xx: disable SmartSpeed before resetting CPU PHYs Date: Wed, 23 Sep 2026 23:57:35 +0200 Message-ID: <20260923215735.234-1-yongzhao.derek@gmail.com> X-Mailer: git-send-email 2.45.2.windows.1 In-Reply-To: References: <20260922202653.1153-6-yongzhao.derek@gmail.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Hi Andrew, Yes. In the RA74 trace, generic config_aneg() returned successfully with CTRL1000 at 0x0600. A later read found 0x0400, so 1000BASE-T full-duplex advertisement had been cleared by then. I did not capture when it changed. The instrumented Clause 22 BMCR/CTRL1000 path showed no intervening write; other paths were not ruled out. SmartSpeed is the downshift feature. I have no evidence of a broken pair or a successful fallback to 100 Mb/s. The 0x0400 value describes advertised capability, not the negotiated speed. Clearing SmartSpeed before the initial reset kept the internal link at 1 Gb/s during the tested RA74 boot sequence. The trigger remains unknown. Thanks, Yongzhao Chen