From: Yongzhao Chen <yongzhao.derek@gmail.com>
To: Andrew Lunn <andrew@lunn.ch>
Cc: netdev@vger.kernel.org, Vladimir Oltean <olteanv@gmail.com>,
Christian Marangi <ansuelsmth@gmail.com>,
Heiner Kallweit <hkallweit1@gmail.com>,
Russell King <linux@armlinux.org.uk>,
Florian Fainelli <florian.fainelli@broadcom.com>,
Jonas Gorski <jonas.gorski@gmail.com>,
Woojung Huh <woojung.huh@microchip.com>,
UNGLinuxDriver@microchip.com, Ziyang Huang <hzyitc@outlook.com>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
Simon Horman <horms@kernel.org>
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 [thread overview]
Message-ID: <20260923215735.234-1-yongzhao.derek@gmail.com> (raw)
In-Reply-To: <c50f5ffd-a67d-4adf-a38e-048acf7bd61d@lunn.ch>
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
next prev parent reply other threads:[~2026-09-23 21:57 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-22 20:26 [RFC PATCH net-next v2 0/5] net: dsa: qca8k: add a QCA8337 CPU PHY consumer Yongzhao Chen
2026-09-22 20:26 ` [RFC PATCH net-next v2 1/5] net: dsa: pass PHY flags when connecting shared ports Yongzhao Chen
2026-09-22 21:49 ` Florian Fainelli
2026-09-22 20:26 ` [RFC PATCH net-next v2 2/5] net: dsa: qca8k: support an internal PHY as the CPU port Yongzhao Chen
2026-09-22 20:26 ` [RFC PATCH net-next v2 3/5] net: dsa: qca8k: serialize CPU MAC pause during MTU changes Yongzhao Chen
2026-09-22 20:58 ` Andrew Lunn
2026-09-23 21:57 ` Yongzhao Chen
2026-09-22 20:26 ` [RFC PATCH net-next v2 4/5] net: dsa: qca8k: flag QCA8337 internal CPU PHYs for SmartSpeed Yongzhao Chen
2026-09-22 21:00 ` Andrew Lunn
2026-09-23 21:57 ` Yongzhao Chen
2026-09-22 20:26 ` [RFC PATCH net-next v2 5/5] net: phy: qca83xx: disable SmartSpeed before resetting CPU PHYs Yongzhao Chen
2026-09-22 21:06 ` Andrew Lunn
2026-09-23 21:57 ` Yongzhao Chen [this message]
2026-09-24 12:30 ` Andrew Lunn
2026-09-24 23:48 ` Yongzhao Chen
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