From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi1-f171.google.com (mail-oi1-f171.google.com [209.85.167.171]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0F51226F2A0 for ; Fri, 5 Jun 2026 01:00:41 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.171 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780621257; cv=none; b=KjppYYNP3dgqBkDiSQGD6vwDB/9b1wfrcndQrOPvZpP9W85MNJV68OCaufWBova1MmKbDbiQuGmBNUmFa+Pmf+GXwWSBFSq/CIyd7H2FhFE8IEX+Q+U9NOuniUo1TN4WKxfgetyGP/6qD38aOHWJMFMKfLa12cU5BKFNROl/9PM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780621257; c=relaxed/simple; bh=Fl2vvfFimqS4GlpOM20DZtsfCLCrtWoZalqmHnKTKCc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=GarQP0MapYmys6rj6qhClw3IXNivRux+mTjqBWqYIMyGM2csznVuZs9VHxMvTn04G+bLF3VePy1r4XxZF77B52Aqwvai8faGXtu1RydCJv8kX9q8JRG86jnO3FoPYVoOd0BrJPOn0FHBeexktTiS/5/pEjZuSo0CC1HB2jkw0Nw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=riscstar.com; spf=pass smtp.mailfrom=riscstar.com; dkim=pass (2048-bit key) header.d=riscstar-com.20251104.gappssmtp.com header.i=@riscstar-com.20251104.gappssmtp.com header.b=hnPP2LhC; arc=none smtp.client-ip=209.85.167.171 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=riscstar.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=riscstar.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=riscstar-com.20251104.gappssmtp.com header.i=@riscstar-com.20251104.gappssmtp.com header.b="hnPP2LhC" Received: by mail-oi1-f171.google.com with SMTP id 5614622812f47-4862ed6ab36so811669b6e.1 for ; Thu, 04 Jun 2026 18:00:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=riscstar-com.20251104.gappssmtp.com; s=20251104; t=1780621241; x=1781226041; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=EZkK5iRkM+bFu8r36hoA1oZzT41u9/qmzwRkx8FhOsM=; b=hnPP2LhCrmphc0LS/cRwIZU/py9l8iqMlf/5s76G55Vbm22SCgKVelKwBEkfF4qIZO NtHYL02toKdC1nI87qUMsmfD1yplesNL04PK7gmMP+7FPrlLHUwP7vx1KGzcLT7w+UjO od15QFIpPyVrVlCbHpUppdWGsiZfGqOKKOPzPtsR3con7QeX2QmIG0wI+hDkWGNRH/k+ 0Z/Rikks1UulXIN9VvXGldIawMTkALO+12U/8NWaFwTwfljOVJNAu/SffsPJOYtQa7LE TFYGw/qDgWbPhJ0Qjr3bSbf3C+D+z1CuU98jyXVDDbGgp95VMcf4tqUOa/gNbJCUIkrB qp1Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1780621241; x=1781226041; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=EZkK5iRkM+bFu8r36hoA1oZzT41u9/qmzwRkx8FhOsM=; b=cmEO6HFg+x3/7cWYzjgXt9c6qZO+3PBkmW4x2xeIaDwQG1B7oq53F3agyRXK8ycuzY jhjU1gSTOmhRi9vg58MFQ5+G2aJ+EzOPjcvjikf4f2WTZGMXFhEsf6BUdIfI5tBYBJbo d9+FZRiIEc93efPxMuII8EIXPYDo0K72T+UVYmfmtKMlPQuOfN6JzTXUhE9/JH48C4fF UHawQkBli12Mye18TDpNSO+ahLsFCjTKL2SwtpVkvQwuAI/ogFsH1nx4XAh8++2FGYWH 5Iygpu6W9rzumG1sFIhnnAxBZKHOyXXCryhkSNhKmoxu8kzVgyPwYEYXo4WoOqxXQ0q+ P5HA== X-Forwarded-Encrypted: i=1; AFNElJ/Bq9yWZS6f8dZgfFKlcpCBFSbDeky8FIpRP10BsdgrG1iD6n+VSwb9/9SIG4wHVGyzkeRL4e1TKch4gEc=@vger.kernel.org X-Gm-Message-State: AOJu0YwfSyINmJrZSUebPT2myGcAXYQ3HdK3vWmr/YO6An1MfePRuKY1 7EtxGynlRMVPB4m0vrwBCrJ17m2qxlBz3kx0+7lhhWeE4tkl5zgMRfniuAhU+/G1jgE= X-Gm-Gg: Acq92OGvVlKX1pk5iM27go7FdTRkUz0oScoOZ8pBYSeWJUh7wfdWfHVygHeeEmwzIO5 vXqa/Fc+OUFeAns1KDRQRtqNOOckgEeN8k5GJjMDifYqbmos4TyqDtm2KqWcoG7U5kHbVTck9Ng l8k4Kxznv1b0YlDlLMTMwYojf/PWYabis+N9WpB2sVfdRyi6Ac5xAeuY8KSlMOokFaW0d8ArtWE VMMsuXlNef1HP2t5JQfzDjWmFTbMWAO3oSe8VU5FHPcsULMPlpgQN8FTujKo8p0VSN95C9LmnvO 7AaxO9AwfVU9P9kPPzEyefxRbigFJZSq0LJzJvd4g67JBFHtb3YsuodjKyD6Cc8DPmAFKu8eKmd 31eN/rEzCZpco86bNBGI9cf93klfIRe6Coue3EwY4qWIkpgAdJ5LGc2oXiWYK23Qr7CclIFAbmy sozw/dvP0wGqM+j1EOLNWiynXDF/HeZEmiVsQhfw== X-Received: by 2002:a05:6808:1b0e:b0:467:5f1:fc93 with SMTP id 5614622812f47-4868dbe795amr869921b6e.9.1780621240655; Thu, 04 Jun 2026 18:00:40 -0700 (PDT) Received: from zippy.localdomain ([73.62.185.64]) by smtp.gmail.com with ESMTPSA id 5614622812f47-4865b6ec694sm5544631b6e.5.2026.06.04.18.00.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 04 Jun 2026 18:00:40 -0700 (PDT) From: Alex Elder To: andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, maxime.chevallier@bootlin.com, rmk+kernel@armlinux.org.uk, andersson@kernel.org, konradybcio@kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, linusw@kernel.org, brgl@kernel.org, arnd@arndb.de, gregkh@linuxfoundation.org Cc: Daniel Thompson , elder@riscstar.com, mohd.anwar@oss.qualcomm.com, a0987203069@gmail.com, alexandre.torgue@foss.st.com, ast@kernel.org, boon.khai.ng@altera.com, chenchuangyu@xiaomi.com, chenhuacai@kernel.org, daniel@iogearbox.net, hawk@kernel.org, hkallweit1@gmail.com, inochiama@gmail.com, john.fastabend@gmail.com, julianbraha@gmail.com, livelycarpet87@gmail.com, mcoquelin.stm32@gmail.com, me@ziyao.cc, prabhakar.mahadev-lad.rj@bp.renesas.com, richardcochran@gmail.com, rohan.g.thomas@altera.com, sdf@fomichev.me, siyanteng@cqsoftware.com.cn, weishangjuan@eswincomputing.com, wens@kernel.org, netdev@vger.kernel.org, bpf@vger.kernel.org, linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-gpio@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH net-next v2 04/14] net: pcs: xpcs: re-order xpcs_pre_config() to update after the reset Date: Thu, 4 Jun 2026 20:00:11 -0500 Message-ID: <20260605010022.968612-5-elder@riscstar.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260605010022.968612-1-elder@riscstar.com> References: <20260605010022.968612-1-elder@riscstar.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Daniel Thompson Currently, on Wangxun platforms, the XPCS is configured during the call to xpcs_switch_interface_mode() and, if the need_reset flag is set, the XPCS is reset and the configuration will be lost. This is harmless at present because need_reset will never actually be set on these platforms. Nevertheless having xpcs_switch_interface_mode() on the wrong side of the reset is an obstacle for future changes where wiping out programmed configuration with a reset could be harmful. Reorder xpcs_pre_config() to allow the reset can happen before we switch interface mode. To make this work we have to hoist the special case logic for SGMII into the parent function. Signed-off-by: Daniel Thompson Signed-off-by: Alex Elder --- drivers/net/pcs/pcs-xpcs.c | 56 ++++++++++++++++++++------------------ 1 file changed, 30 insertions(+), 26 deletions(-) diff --git a/drivers/net/pcs/pcs-xpcs.c b/drivers/net/pcs/pcs-xpcs.c index e69fa2f0a0e8d..76c04372b5b50 100644 --- a/drivers/net/pcs/pcs-xpcs.c +++ b/drivers/net/pcs/pcs-xpcs.c @@ -705,46 +705,50 @@ static void xpcs_get_interfaces(struct dw_xpcs *xpcs, unsigned long *interfaces) static int xpcs_switch_interface_mode(struct dw_xpcs *xpcs, phy_interface_t interface) { - int ret = 0; + /* Wangxun provides a full alternative implementation to handle quirks */ + if (xpcs->info.pma == WX_TXGBE_XPCS_PMA_10G_ID) + return txgbe_xpcs_switch_mode(xpcs, interface); - if (xpcs->info.pma == WX_TXGBE_XPCS_PMA_10G_ID) { - ret = txgbe_xpcs_switch_mode(xpcs, interface); - } else if (xpcs->interface != interface) { - if (interface == PHY_INTERFACE_MODE_SGMII) - xpcs->need_reset = true; - xpcs->interface = interface; - } + xpcs->interface = interface; - return ret; + return 0; } static void xpcs_pre_config(struct phylink_pcs *pcs, phy_interface_t interface) { struct dw_xpcs *xpcs = phylink_pcs_to_xpcs(pcs); const struct dw_xpcs_compat *compat; + bool force_reset; int ret; + /* + * According to the XPCS datasheet, a soft reset is required to initiate + * Clause 37 auto-negotiation when the XPCS switches interface modes. + */ + force_reset = interface == PHY_INTERFACE_MODE_SGMII; + + if (force_reset || xpcs->need_reset) { + compat = xpcs_find_compat(xpcs, interface); + if (!compat) { + dev_err(&xpcs->mdiodev->dev, "unsupported interface %s\n", + phy_modes(interface)); + return; + } + + ret = xpcs_soft_reset(xpcs, compat); + if (ret) { + dev_err(&xpcs->mdiodev->dev, "soft reset failed: %pe\n", + ERR_PTR(ret)); + return; + } + + xpcs->need_reset = false; + } + ret = xpcs_switch_interface_mode(xpcs, interface); if (ret) dev_err(&xpcs->mdiodev->dev, "switch interface failed: %pe\n", ERR_PTR(ret)); - - if (!xpcs->need_reset) - return; - - compat = xpcs_find_compat(xpcs, interface); - if (!compat) { - dev_err(&xpcs->mdiodev->dev, "unsupported interface %s\n", - phy_modes(interface)); - return; - } - - ret = xpcs_soft_reset(xpcs, compat); - if (ret) - dev_err(&xpcs->mdiodev->dev, "soft reset failed: %pe\n", - ERR_PTR(ret)); - - xpcs->need_reset = false; } static int xpcs_config_aneg_c37_sgmii(struct dw_xpcs *xpcs, -- 2.51.0