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[93.34.89.239]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4953f643acdsm3214055e9.3.2026.07.15.01.44.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 15 Jul 2026 01:44:35 -0700 (PDT) Message-ID: <6a574873.3027643f.39eab0.b4c0@mx.google.com> X-Google-Original-Message-ID: Date: Wed, 15 Jul 2026 10:44:33 +0200 From: Christian Marangi To: Coia Prant Cc: Maxime Chevallier , kuba@kernel.org, davem@davemloft.net, edumazet@google.com, pabeni@redhat.com, andrew+netdev@lunn.ch, robh@kernel.org, krzk+dt@kernel.org, heiko@sntech.de, netdev@vger.kernel.org, linux-rockchip@lists.infradead.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-phy@lists.infradead.org Subject: Re: [RFC PATCH 01/10] net: stmmac: move XPCS lifetime management to platform drivers References: <20260714191341.690906-1-coiaprant@gmail.com> <20260714191341.690906-2-coiaprant@gmail.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: On Wed, Jul 15, 2026 at 04:17:50PM +0800, Coia Prant wrote: > Maxime Chevallier 于2026年7月15日周三 15:31写道： > > > > Hi, > > > > +Christian > > > > On 7/14/26 21:08, Coia Prant wrote: > > > The current XPCS creation logic in stmmac_pcs_setup() is problematic > > > for several reasons. > > > > > > First, if a device tree specifies a "pcs-handle" but no select_pcs() > > > callback is provided by the platform driver, the created XPCS is never > > > used. The phylink framework requires select_pcs() to actually return > > > the PCS to the core, so the pcs-handle property becomes effectively > > > useless without the matching callback. This is confusing for developers > > > who expect that specifying a pcs-handle in their device tree should be > > > sufficient to enable the PCS. > > > > I think Christian's work on fwnode PCS would help a lot with that PCS > > handling in stmmac: > > > > https://lore.kernel.org/netdev/20260618125752.1223-1-ansuelsmth@gmail.com/ > > > > I don't know when Christian plans to iterate, it could be worth using > > that new fwnode mechanism here ? > > > > Maxime > > Hi Maxime, > > Thanks for pointing me to Christian's work. This looks like a > much-needed improvement. > > I actually spent all night debugging call traces caused by the current > stmmac PCS lifetime management, and it was not a pleasant experience. > The code feels like accumulated technical debt that should be cleaned > up. > Yes we also got a similar situation with an ipq50xx SoC where the standalone PCS feature was implemented (I can add reference to OpenWrt code) and we also had some ""magic"" code to implement PCS as it does use the DWMAC plat. It seems for DWMAC PCS is very abstracted and have at least 3 different implementation aside from the common "select_pcs" one. > Regarding timeline: since Christian's series is still in RFC with an > uncertain merge date, I'd prefer to keep this series as-is for now, as > it solves the problem for Rockchip and has already started receiving > review feedback. Once Christian's fwnode PCS work lands in net-next, > I'm happy to rebase and convert the Rockchip glue driver to the new > interface. The series in RFC just because i posted while net-next was closed but it's not in RFC state. (sashiko is starting to hallucinate problems) I plan to post v10 today but still low review aside from ""lovely"" bot. > > One thing I'd really like to see: the ability to specify the logical > MII port instance via something like: > > pcs-handle = <&pcs MII_PortX>; > > That would make the DT binding much cleaner and more flexible for > multi-port configurations. That is exactly one of the main feature of this new implementation as is already used downstream by Airoha SoC where a PCIe PCS expose 2 PCS from a single provider. (the code use the simple consumer/provider pattern and the driver have complete freedom of applying whatever logic is needed when returning the correct cell) I think the idea of Maxime is to test that series on most Scenario as possible to verify for fragility or regression on it. (but just for Maxime the feature is getting actively used on OpenWrt by 3 different SoC and no complain for now) -- Ansuel From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 8B309C44501 for ; Wed, 15 Jul 2026 08:44:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Subject:Cc:To:From:Date:Message-ID:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=6YkCRHlIZw2fDG2n7U+I09OijEEIM9waUJ+ocMi6Qa8=; b=I4buHVpG6GANzB UUb2P+qgK+yO44oLwDUDG3rVw9PYmlt/nCtU4K4o1lCDNzPNX8F4dP5b4/cdDc4aq/EE17T/K8ElH VfCWDF/FosZYN6tGjIBUeBexaCvoSGkoL2J02WUb01zm+OKMG/cyqmXjKYbubF4hrbRehDhmFWjty byFSUgmfJrmVQgu/0xzD4K1WCLhSSMh0i7pLPAX3mv8shMe8/QmYKFjyrcBvyEb8vnm4p9Bs81aKG VtQi6sGhSOZnas7e70vWlA0vUrC/A3CX+74HJxmqXBF6MSteUD7+07TBfAbymD4wbOc4YOcsw8RmC 14Ti7FkIPmd5xhFu5aqQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wjvER-0000000EBkm-0lYh; Wed, 15 Jul 2026 08:44:43 +0000 Received: from mail-wm1-x32b.google.com ([2a00:1450:4864:20::32b]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wjvEM-0000000EBin-37xX for linux-phy@lists.infradead.org; Wed, 15 Jul 2026 08:44:41 +0000 Received: by mail-wm1-x32b.google.com with SMTP id 5b1f17b1804b1-493c7902f47so44445645e9.1 for ; Wed, 15 Jul 2026 01:44:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1784105076; x=1784709876; darn=lists.infradead.org; h=in-reply-to:content-transfer-encoding:content-disposition :content-type:mime-version:references:subject:cc:to:from:date :message-id:from:to:cc:subject:date:message-id:reply-to:content-type; bh=6hz7WPKd8nuv0g834JzI7w/vUzS6TIu2DOFmMdBw0Pc=; b=IHeGtjFgKxM6wKVJvCWg7Ty4ehybxlanCY0XsAEbxoyAyiejUhZiJCEUdutd85Dvkr QiOgSrfXHBOKturb3CWS90kY3PcHs0tPx9+Tkf/SVb5FAsYYYDR6Ay9Gh0DkcXRDa9jk sf0Nf8uoKvZf5hqvzMAw6duNkzdUVLykDfAPM4iYpoJ0f4GnR67PnQFvKRjEhNHSvki+ UIrrVKj8Hx1PpZtp9u/YxDNA+JsFjL4H+I4zhTfiRtiK9qPYvpZSYQfkWOtye32ZH4eD l6FBmnq4JQR2h1Zfbv2owEnD9RtKPz5O35l60Cf54YVXl+rbtd/CRYJSOOV/bcgnBe6h js+A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1784105076; x=1784709876; h=in-reply-to:content-transfer-encoding:content-disposition :content-type:mime-version:references:subject:cc:to:from:date :message-id:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to:content-type; bh=6hz7WPKd8nuv0g834JzI7w/vUzS6TIu2DOFmMdBw0Pc=; b=grMEBVNWkYxSBsfSjnfK0+hzu5DP8yVdQ6s/CYpM9PBFw6H+eg/KfBs5Z/sTQQ09mb vsePD0vQ+ZGIIR1IlGsY8syxGGlWwA7tEHrPzfFfNf5wXTgva6ruxdKyUQbKL1e1gk0t spAvzbRdPdBoZQ+bwhLFD8basX+qQRWL7O7a8JRJtkmhvV3MRCbDK10d6L5bi3rQmmlk K8VOqurYOVobBG4zvmF5eesXNxHXO992KNDh8A38Sgs/CWDQ84QI0IL4a/6eTUH5PFDj WhYMVeaFZiHAC04z9x/GGU2N8DmEb+fAUbPWln4bBE1YeVOQPB7/yznyg/zMcbLKGuuo nKww== X-Forwarded-Encrypted: i=1; AHgh+RpV5hoNGg4nTI4vYFe6+Hm7UEPgkKIvlXg2AVl+vCKUOzfBbMYP7yo5g8jYnOCNJsndGH/bSPuhSss=@lists.infradead.org X-Gm-Message-State: AOJu0Yw/AQ64aD6GuZgJD/Ml7/qyHFP3P+jVopo0dp79ufWsb6JHp/pZ qNemo/f8tkUYox45IUECfNZGI5lgnIa8gEmhSwabSgumLsmENqYycv8X X-Gm-Gg: AfdE7clOmdNaD7JMZv8fbJIXIFINb5HEF1COjGMmwStuyGRGq18wTVBFqvB74PI/Z82 eGJ7ZCqBDuHP7ddFeQWFDepank7x8bj06FeEH4HYDXNrb89gg2U0k7lXbqV8aaojx/V2TjSsEKL ixWwF/vFKffR+8oTOBLm/De/mVYrBwqu36GHC8yBaKNUO5VrnQtiX1E4qrt1becoanoNE9/IAQO NZvbSUbx611ZZ/idonX/3UTZ7c6vK1yj8e2/iVL59YAfY2LAEnNBnOH5yYjfxmJfYwV8n0Ig4x6 Ley1SAYZ9cIlpjxS0bL1nvh1hHkNCLuCz583bxj/qSGEA57cwASiEVyVMUg/E7OxU9djAtv+JMe pEvMGF1sRBYN7Vg6FNN3JuefFzUsNoDA4A29+TCUVkm+PTQWJHYLSwrdTgwZLVhLD4wFPhnN6dM BzYyb+GdcGXlmgsnlKu8s334xkbsCcYpDkG1O+FYB3J55v X-Received: by 2002:a7b:c38b:0:b0:493:c4e1:40a6 with SMTP id 5b1f17b1804b1-4953c28b6bdmr14477935e9.32.1784105076212; Wed, 15 Jul 2026 01:44:36 -0700 (PDT) Received: from Ansuel-XPS. 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[93.34.89.239]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4953f643acdsm3214055e9.3.2026.07.15.01.44.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 15 Jul 2026 01:44:35 -0700 (PDT) Message-ID: <6a574873.3027643f.39eab0.b4c0@mx.google.com> X-Google-Original-Message-ID: Date: Wed, 15 Jul 2026 10:44:33 +0200 From: Christian Marangi To: Coia Prant Cc: Maxime Chevallier , kuba@kernel.org, davem@davemloft.net, edumazet@google.com, pabeni@redhat.com, andrew+netdev@lunn.ch, robh@kernel.org, krzk+dt@kernel.org, heiko@sntech.de, netdev@vger.kernel.org, linux-rockchip@lists.infradead.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-phy@lists.infradead.org Subject: Re: [RFC PATCH 01/10] net: stmmac: move XPCS lifetime management to platform drivers References: <20260714191341.690906-1-coiaprant@gmail.com> <20260714191341.690906-2-coiaprant@gmail.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260715_014438_941643_B180610F X-CRM114-Status: GOOD ( 31.37 ) X-BeenThere: linux-phy@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Linux Phy Mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; 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