From patchwork Wed Mar 5 18:00:39 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Russell King (Oracle)" X-Patchwork-Id: 14003120 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 D320FC19F32 for ; Wed, 5 Mar 2025 18:06:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Date:Message-Id:Content-Type :Content-Transfer-Encoding:MIME-Version:Subject:Cc:To:From:References: In-Reply-To:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=9pjvvYJp8ichoRJUtSiiKLOuz012/ax4BEbPrpv6NLs=; b=m9QScioRuRLb8ncPYxCtD8kGMM nVjuz1VHxxT+9srkI/QAbmz1pfPi4YKFB0V9B+x44RrJlQnSH3wlxEw7i8wAAVbRm79cvG9rd2sy8 DjTZHY0sQ40Jb21s7+7IpEk8ekP582+UfpewiqHD4NFedRM2UgmYeolv5bAe7PubaM4iz3XEg0Nyt F1DWQFbjCpz7rnf9S07wxjAyJ8wVEWWKHlDzsI8bVkIYFlEa+HBl4ui6yyWOZvMj1PBgape1LsCxB SOrzjS1FfHbRFTxlZRTzwiv57OOfiBd9FW6qKqlNMVB5AhZOaf2en500cUTWNW6Dh2fwkApLcA4jZ HUdI9j6A==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tpt8K-00000008sRg-2R5i; Wed, 05 Mar 2025 18:06:16 +0000 Received: from pandora.armlinux.org.uk ([2001:4d48:ad52:32c8:5054:ff:fe00:142]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1tpt3K-00000008rgv-1kMK for linux-arm-kernel@lists.infradead.org; Wed, 05 Mar 2025 18:01:07 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=armlinux.org.uk; s=pandora-2019; h=Date:Sender:Message-Id:Content-Type: Content-Transfer-Encoding:MIME-Version:Subject:Cc:To:From:References: In-Reply-To:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=9pjvvYJp8ichoRJUtSiiKLOuz012/ax4BEbPrpv6NLs=; b=uKBqHpeTGcB85XoF3h9x+TY4pg 5N5vTCybXOOkh6oIh/h9iNz9c9mTmL68EoXao2m/KC6fY2lka0DWgHetPF/yFTm6nFuwHNAufQYAe gR1N4h1TN8KAc/b8rUZNW9TtF8CpChPZINuZTZHIp+zUdgOgM6RJ56ag5JQ3S72UvgSPQsb+fMGLI h6vVrJEUiw2NQNIQLlyYXZSbmmxel8smKyeyXypnYuIUWbbfe04OxU9tQ/4VptoMzS5zc41Jy5CAs JUwWQtU0CsGAzOisg7tCnYRzoIqbXWAQMTeU8LJmSbGytdUWjIbIY/9XyHX56N7M0og4fROtVljHv vV8yo89A==; Received: from e0022681537dd.dyn.armlinux.org.uk ([fd8f:7570:feb6:1:222:68ff:fe15:37dd]:45972 helo=rmk-PC.armlinux.org.uk) by pandora.armlinux.org.uk with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1tpt3D-0004gu-2T; Wed, 05 Mar 2025 18:00:59 +0000 Received: from rmk by rmk-PC.armlinux.org.uk with local (Exim 4.94.2) (envelope-from ) id 1tpt2t-005UNB-MC; Wed, 05 Mar 2025 18:00:39 +0000 In-Reply-To: References: From: "Russell King (Oracle)" To: Jon Hunter , Thierry Reding , "Lad, Prabhakar" Cc: Alexandre Torgue , Andrew Lunn , Andrew Lunn , "David S. Miller" , Eric Dumazet , Heiner Kallweit , Jakub Kicinski , linux-arm-kernel@lists.infradead.org, linux-stm32@st-md-mailman.stormreply.com, Maxime Coquelin , netdev@vger.kernel.org, Paolo Abeni Subject: [PATCH net-next 1/2] net: phylink: add functions to block/unblock rx clock stop MIME-Version: 1.0 Content-Disposition: inline Message-Id: Date: Wed, 05 Mar 2025 18:00:39 +0000 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250305_100106_454236_AD58F9DD X-CRM114-Status: GOOD ( 15.63 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Some MACs require the PHY receive clock to be running to complete setup actions. This may fail if the PHY has negotiated EEE, the MAC supports receive clock stop, and the link has entered LPI state. Provide a pair of APIs that MAC drivers can use to temporarily block the PHY disabling the receive clock. Signed-off-by: Russell King (Oracle) --- drivers/net/phy/phylink.c | 50 +++++++++++++++++++++++++++++++++++++++ include/linux/phylink.h | 3 +++ 2 files changed, 53 insertions(+) diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c index a3b186ab3854..8f93b597d019 100644 --- a/drivers/net/phy/phylink.c +++ b/drivers/net/phy/phylink.c @@ -88,6 +88,7 @@ struct phylink { bool mac_enable_tx_lpi; bool mac_tx_clk_stop; u32 mac_tx_lpi_timer; + u8 mac_rx_clk_stop_blocked; struct sfp_bus *sfp_bus; bool sfp_may_have_phy; @@ -2592,6 +2593,55 @@ void phylink_stop(struct phylink *pl) } EXPORT_SYMBOL_GPL(phylink_stop); + +void phylink_rx_clk_stop_block(struct phylink *pl) +{ + ASSERT_RTNL(); + + if (pl->mac_rx_clk_stop_blocked == U8_MAX) { + phylink_warn(pl, "%s called too many times - ignoring\n", + __func__); + dump_stack(); + return; + } + + /* Disable PHY receive clock stop if this is the first time this + * function has been called and clock-stop was previously enabled. + */ + if (pl->mac_rx_clk_stop_blocked++ == 0 && + pl->mac_supports_eee_ops && pl->phydev) + pl->config->eee_rx_clk_stop_enable) + phy_eee_rx_clock_stop(pl->phydev, false); +} + +/** + * phylink_rx_clk_stop_unblock() - unblock PHY ability to stop receive clock + * @pl: a pointer to a &struct phylink returned from phylink_create() + * + * All calls to phylink_rx_clk_stop_block() must be balanced with a + * corresponding call to phylink_rx_clk_stop_unblock() to restore the PHYs + * clock stop ability. + */ +void phylink_rx_clk_stop_unblock(struct phylink *pl) +{ + ASSERT_RTNL(); + + if (pl->mac_rx_clk_stop_blocked == 0) { + phylink_warn(pl, "%s called too many times - ignoring\n", + __func__); + dump_stack(); + return; + } + + /* Re-enable PHY receive clock stop if the number of unblocks matches + * the number of calls to the block function above. + */ + if (--pl->mac_rx_clk_stop_blocked == 0 && + pl->mac_supports_eee_ops && pl->phydev && + pl->config->eee_rx_clk_stop_enable) + phy_eee_rx_clock_stop(pl->phydev, true); +} + /** * phylink_suspend() - handle a network device suspend event * @pl: a pointer to a &struct phylink returned from phylink_create() diff --git a/include/linux/phylink.h b/include/linux/phylink.h index 08df65f6867a..249c437d6b7b 100644 --- a/include/linux/phylink.h +++ b/include/linux/phylink.h @@ -698,6 +698,9 @@ int phylink_pcs_pre_init(struct phylink *pl, struct phylink_pcs *pcs); void phylink_start(struct phylink *); void phylink_stop(struct phylink *); +void phylink_rx_clk_stop_block(struct phylink *); +void phylink_rx_clk_stop_unblock(struct phylink *); + void phylink_suspend(struct phylink *pl, bool mac_wol); void phylink_resume(struct phylink *pl);