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 3BB33C19778 for ; Wed, 26 Feb 2025 13:25:13 +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:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=u959TBYWOv9S7YvoxEBIspvDOHEq4YyJ10CaapL1Rnw=; b=cF0S6ezpkwTZOvzehCzk+/fnR2 bKXEaH84EbsF06ZtIJAyUtDxmBYz4hbxpGjmdbV1qIqrCUYbRjL/N/FJf0dbsEpL0eslrSgQ/oj5f ISXmda0hpVr4yCAz/2uTFuUVBbKRbg80oNYzDdr4IwGUtl6b6to7lXl3DKl6xshwTiMFBmL3O6F5T LxQjhkBjfZdG0oo7+rdjUjUaQBE/jfxjAqUJuudMriXIwQi6uPUIUfY4sgh/0vdgCqEUKwOwvmFm9 LKCfpAZxwvsgD2/xzUtPStumxg6AHVAuUFYiyvEPh1E4AzC9sqO9fGEODPes2ZUAuCGNnoIV/6RW3 2UXKnZQg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tnHP6-00000003pXC-38wF; Wed, 26 Feb 2025 13:24:48 +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 1tnF9B-00000003Otf-2AFx for linux-arm-kernel@lists.infradead.org; Wed, 26 Feb 2025 11:00:17 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=armlinux.org.uk; s=pandora-2019; h=Sender:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding: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=u959TBYWOv9S7YvoxEBIspvDOHEq4YyJ10CaapL1Rnw=; b=YpuC46+xpDCnI9LSS2IXu08VWA RAQ4FGKjOmXC7t3M5vbVF2q93gZ/nbORvFCxSvEZAW1CdpdJsBLQSOA50BBqM0qKA6NBQ1EQn2sQ7 jTAYkPaiNYVJvfNElRkwbjFDmwkq0XQG66S7ZKmB1Ze/GkTIa5moVBOKdTsULxLvxcsOj3lWeM9qe pk5jghlkg/CZxlwKFYkAqfWWCoBmUwScTMyFqomSM5F6kfqHfV1c4O6PA3qlqDik3d7jlsrQNXPa1 8bV/HpTG2ICCPy2zXQutFS2/sUBKCvMlNpmdMnrUCXB5oIo8CKPMUu5j1AXX1R9KKE5AWTgAtk3US 1H5xstuQ==; Received: from shell.armlinux.org.uk ([fd8f:7570:feb6:1:5054:ff:fe00:4ec]:52384) by pandora.armlinux.org.uk with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1tnF8z-00041N-02; Wed, 26 Feb 2025 11:00:01 +0000 Received: from linux by shell.armlinux.org.uk with local (Exim 4.96) (envelope-from ) id 1tnF8v-000704-13; Wed, 26 Feb 2025 10:59:57 +0000 Date: Wed, 26 Feb 2025 10:59:57 +0000 From: "Russell King (Oracle)" To: Jon Hunter Cc: Andrew Lunn , Heiner Kallweit , Alexandre Torgue , Andrew Lunn , Bryan Whitehead , "David S. Miller" , Eric Dumazet , Jakub Kicinski , linux-arm-kernel@lists.infradead.org, linux-stm32@st-md-mailman.stormreply.com, Marcin Wojtas , Maxime Coquelin , netdev@vger.kernel.org, Paolo Abeni , UNGLinuxDriver@microchip.com, "linux-tegra@vger.kernel.org" Subject: Re: [PATCH net-next 9/9] net: stmmac: convert to phylink managed EEE support Message-ID: References: <86fae995-1700-420b-8d84-33ab1e1f6353@nvidia.com> <203871c2-c673-4a98-a0a3-299d1cf71cf0@nvidia.com> <31731125-ab8f-48d9-bd6f-431d49431957@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250226_030013_565183_F1949DC4 X-CRM114-Status: GOOD ( 52.95 ) 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 On Wed, Feb 26, 2025 at 10:11:58AM +0000, Jon Hunter wrote: > > On 26/02/2025 10:02, Russell King (Oracle) wrote: > > On Tue, Feb 25, 2025 at 02:21:01PM +0000, Jon Hunter wrote: > > > Hi Russell, > > > > > > On 19/02/2025 20:57, Russell King (Oracle) wrote: > > > > So, let's try something (I haven't tested this, and its likely you > > > > will need to work it in to your other change.) > > > > > > > > Essentially, this disables the receive clock stop around the reset, > > > > something the stmmac driver has never done in the past. > > > > > > > > diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c > > > > index 1cbea627b216..8e975863a2e3 100644 > > > > --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c > > > > +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c > > > > @@ -7926,6 +7926,8 @@ int stmmac_resume(struct device *dev) > > > > rtnl_lock(); > > > > mutex_lock(&priv->lock); > > > > + phy_eee_rx_clock_stop(priv->dev->phydev, false); > > > > + > > > > stmmac_reset_queues_param(priv); > > > > stmmac_free_tx_skbufs(priv); > > > > @@ -7937,6 +7939,9 @@ int stmmac_resume(struct device *dev) > > > > stmmac_restore_hw_vlan_rx_fltr(priv, ndev, priv->hw); > > > > + phy_eee_rx_clock_stop(priv->dev->phydev, > > > > + priv->phylink_config.eee_rx_clk_stop_enable); > > > > + > > > > stmmac_enable_all_queues(priv); > > > > stmmac_enable_all_dma_irq(priv); > > > > > > > > > Sorry for the delay, I have been testing various issues recently and needed > > > a bit more time to test this. > > > > > > It turns out that what I had proposed last week does not work. I believe > > > that with all the various debug/instrumentation I had added, I was again > > > getting lucky. So when I tested again this week on top of vanilla v6.14-rc2, > > > it did not work :-( > > > > > > However, what you are suggesting above, all by itself, is working. I have > > > tested this on top of vanilla v6.14-rc2 and v6.14-rc4 and it is working > > > reliably. I have also tested on some other boards that use the same stmmac > > > driver (but use the Aquantia PHY) and I have not seen any issues. So this > > > does fix the issue I am seeing. > > > > > > I know we are getting quite late in the rc for v6.14, but not sure if we > > > could add this as a fix? > > > > The patch above was something of a hack, bypassing the layering, so I > > would like to consider how this should be done properly. > > > > I'm still wondering whether the early call to phylink_resume() is > > symptomatic of this same issue, or whether there is a PHY that needs > > phy_start() to be called to output its clock even with link down that > > we don't know about. > > > > The phylink_resume() call is relevant to this because I'd like to put: > > > > phy_eee_rx_clock_stop(priv->dev->phydev, > > priv->phylink_config.eee_rx_clk_stop_enable); > > > > in there to ensure that the PHY is correctly configured for clock-stop, > > but given stmmac's placement that wouldn't work. > > > > I'm then thinking of phylink_pre_resume() to disable the EEE clock-stop > > at the PHY. > > > > I think the only thing we could do is try solving this problem as per > > above and see what the fall-out from it is. I don't get the impression > > that stmmac users are particularly active at testing patches though, so > > it may take months to get breakage reports. > > > We can ask Furong to test as he seems to active and making changes, but > otherwise I am not sure how well it is being tested across various devices. > On the other hand, it feels like there are still lingering issues like this > with the driver and so I would hope this is moving in the right direction. > > Let me know if you have a patch you want me to test and I will run in on our > Tegra186, Tegra194 and Tegra234 devices that all use this. Do we think this needs to be a patch for the net tree or the net-next tree? I think we've established that it's been a long-standing bug, so maybe if we target net-next to give it more time to be tested? -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!