From patchwork Tue Jan 30 09:28:36 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Romain Gantois X-Patchwork-Id: 13537070 X-Patchwork-Delegate: kuba@kernel.org Received: from relay3-d.mail.gandi.net (relay3-d.mail.gandi.net [217.70.183.195]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 139535DF1E; Tue, 30 Jan 2024 09:28:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.70.183.195 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706606899; cv=none; b=Q52J3yfJmp8N4aKZMmx+GuCmw3HFcljRT/2A/iyx3HV/p/QbUsWEgQAE3lveJMx7B2l95MnUk9aTK/gXPHuG5tfaYh5Nanox8BT2ItVyPlzBsH4byd5OX0gkyMHXNrq01OAnUB3frhaIf6IKLWvE9f/S5d9bi6s0j/7bk7++MW8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706606899; c=relaxed/simple; bh=tkt73i+1cw48XGfzOyOl+3GyajYYCmuIG+3FGbLC78M=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=ILplzJ++Z3xLaxkqrTYGqzGNpu+qbgxyYLvPJlOVmmpY1dDIXnOtYiTHx5hAF+TqQk07cd72hMie9q2yNQfmGL46nWPXj9D9wIlURRVBZJalFynxYyKNuHKZ6iIJHcmivhJ5kWzBcCpbvD5M4HerGxi+oGl4fQlHDXvFvw6aIlE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com; spf=pass smtp.mailfrom=bootlin.com; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b=GnlAE1xE; arc=none smtp.client-ip=217.70.183.195 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=bootlin.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b="GnlAE1xE" Received: by mail.gandi.net (Postfix) with ESMTPSA id 5CEA46000D; Tue, 30 Jan 2024 09:28:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1706606895; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=z5O20HcAEwbcwvmGvpmwDURpDyrqr9bQSjxWrUXZWn8=; b=GnlAE1xENwaIwsGVIRnoLrfTLR3bnZr4e0/SBriECbPlnR0TKm4MeELAPNJs+NH6WcLyOl l2i6waDAjVjYchEwS8B3/4vOx7PFrmbAY9Vwn4tAfXi2HSd6SVGYRzaQchA2SsD5K3yNkm CEqmoAOreNoaU1G6HvdhpUXnhJ0ZhVei8V9D3UCdBkCbdnERC+iQQFRIpHhDaKi0tDhUmp Pyoq/0deGUUJ49SWkY/OzEbzSty7TvZamTqgiOkUbkmSYIZ+feP02uwDtJEutnkEB6Pc7O +9MdBSXoPmmtX/cxNWeHPhH7L5YptdyIA1i2NC4CDkRkrhlZcgM5yENN1cB/dw== From: Romain Gantois Date: Tue, 30 Jan 2024 10:28:36 +0100 Subject: [PATCH net-next v2 1/7] net: phy: add PHY_F_RXC_ALWAYS_ON to PHY dev flags Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240130-rxc_bugfix-v2-1-5e6c3168e5f0@bootlin.com> References: <20240130-rxc_bugfix-v2-0-5e6c3168e5f0@bootlin.com> In-Reply-To: <20240130-rxc_bugfix-v2-0-5e6c3168e5f0@bootlin.com> To: Russell King , Andrew Lunn , Heiner Kallweit , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Alexandre Torgue , Jose Abreu , Maxime Coquelin , =?utf-8?b?Q2zDqW1lbnQgTMOp?= =?utf-8?b?Z2Vy?= Cc: Maxime Chevallier , Miquel Raynal , Thomas Petazzoni , netdev@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, linux-renesas-soc@vger.kernel.org, Romain Gantois X-Mailer: b4 0.12.4 X-GND-Sasl: romain.gantois@bootlin.com X-Patchwork-Delegate: kuba@kernel.org From: Russell King Some MAC controllers (e.g. stmmac) require their connected PHY to continuously provide a receive clock signal. This can cause issues in two cases: 1. The clock signal hasn't been started yet by the time the MAC driver initializes its hardware. This can make the initialization fail, as in the case of the rzn1 GMAC1 driver. 2. The clock signal is cut during a power saving event. By the time the MAC is brought back up, the clock signal is still not active since phylink_start hasn't been called yet. This brings us back to case 1. If a PHY driver reads this flag, it should ensure that the receive clock signal is started as soon as possible, and that it isn't brought down when the PHY goes into suspend. Signed-off-by: Russell King [rgantois: commit log] Signed-off-by: Romain Gantois --- drivers/net/phy/phylink.c | 10 +++++++++- include/linux/phy.h | 1 + include/linux/phylink.h | 4 ++++ 3 files changed, 14 insertions(+), 1 deletion(-) diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c index ed0b4ccaa6a6..851049096488 100644 --- a/drivers/net/phy/phylink.c +++ b/drivers/net/phy/phylink.c @@ -1923,6 +1923,8 @@ static int phylink_bringup_phy(struct phylink *pl, struct phy_device *phy, static int phylink_attach_phy(struct phylink *pl, struct phy_device *phy, phy_interface_t interface) { + u32 flags = 0; + if (WARN_ON(pl->cfg_link_an_mode == MLO_AN_FIXED || (pl->cfg_link_an_mode == MLO_AN_INBAND && phy_interface_mode_is_8023z(interface) && !pl->sfp_bus))) @@ -1931,7 +1933,10 @@ static int phylink_attach_phy(struct phylink *pl, struct phy_device *phy, if (pl->phydev) return -EBUSY; - return phy_attach_direct(pl->netdev, phy, 0, interface); + if (pl->config->mac_requires_rxc) + flags |= PHY_F_RXC_ALWAYS_ON; + + return phy_attach_direct(pl->netdev, phy, flags, interface); } /** @@ -2034,6 +2039,9 @@ int phylink_fwnode_phy_connect(struct phylink *pl, pl->link_config.interface = pl->link_interface; } + if (pl->config->mac_requires_rxc) + flags |= PHY_F_RXC_ALWAYS_ON; + ret = phy_attach_direct(pl->netdev, phy_dev, flags, pl->link_interface); phy_device_free(phy_dev); diff --git a/include/linux/phy.h b/include/linux/phy.h index c9994a59ca2e..3ef30f035bc0 100644 --- a/include/linux/phy.h +++ b/include/linux/phy.h @@ -768,6 +768,7 @@ struct phy_device { /* Generic phy_device::dev_flags */ #define PHY_F_NO_IRQ 0x80000000 +#define PHY_F_RXC_ALWAYS_ON BIT(30) static inline struct phy_device *to_phy_device(const struct device *dev) { diff --git a/include/linux/phylink.h b/include/linux/phylink.h index d589f89c612c..fcee99632964 100644 --- a/include/linux/phylink.h +++ b/include/linux/phylink.h @@ -138,6 +138,9 @@ enum phylink_op_type { * @poll_fixed_state: if true, starts link_poll, * if MAC link is at %MLO_AN_FIXED mode. * @mac_managed_pm: if true, indicate the MAC driver is responsible for PHY PM. + * @mac_requires_rxc: if true, the MAC always requires a receive clock from PHY. + * The PHY driver should start the clock signal as soon as + * possible and avoid stopping it during suspend events. * @ovr_an_inband: if true, override PCS to MLO_AN_INBAND * @get_fixed_state: callback to execute to determine the fixed link state, * if MAC link is at %MLO_AN_FIXED mode. @@ -150,6 +153,7 @@ struct phylink_config { enum phylink_op_type type; bool poll_fixed_state; bool mac_managed_pm; + bool mac_requires_rxc; bool ovr_an_inband; void (*get_fixed_state)(struct phylink_config *config, struct phylink_link_state *state);