From patchwork Mon Nov 21 15:35:22 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jerome Brunet X-Patchwork-Id: 9439631 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 3A46860235 for ; Mon, 21 Nov 2016 15:38:16 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 38AA128AFD for ; Mon, 21 Nov 2016 15:38:16 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 2CD6328B57; Mon, 21 Nov 2016 15:38:16 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.1 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_MED, T_DKIM_INVALID autolearn=unavailable version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id C0D0328AFD for ; Mon, 21 Nov 2016 15:38:15 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.85_2 #1 (Red Hat Linux)) id 1c8qds-0005B3-P7; Mon, 21 Nov 2016 15:36:24 +0000 Received: from mail-wm0-x236.google.com ([2a00:1450:400c:c09::236]) by bombadil.infradead.org with esmtps (Exim 4.85_2 #1 (Red Hat Linux)) id 1c8qdc-00051d-OW for linux-arm-kernel@lists.infradead.org; Mon, 21 Nov 2016 15:36:11 +0000 Received: by mail-wm0-x236.google.com with SMTP id u144so22377486wmu.1 for ; Mon, 21 Nov 2016 07:35:48 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=baylibre-com.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=Uttq6QXxfpMtsaotMm2CdeNTdaxbfQnbJgqUCusVj64=; b=RDpQoLD85M/yGlVHwJgQwggtvWm8K1XpLQo1Vo8deutdeIptnmO6YgQ5CBKHc6gihB naCbrz0Akkt7VyB/+YwHjCey7TnGCdY5nIF84wK+l8yqRGnAO/Dk78ldse1abTOwDBk+ LXvbIj1w5YFDgQABye7eOxs5yNGUzCRetydWY3aXPyT1+AaODZ61BD8pMTQDtBMyFbOt L5bUIksbI80Vt7J/ZwBlqBjUey0UB1VBktGj+SWsp/Cjpu+4mzG7Ox0P+NTOaxVqFayn HAeASHVqbbQZ3e5UZ4r25ruvqPM4HZWdNtW0mpRAEnhl4+o3Ac1V42onawx7/tZLtjOF ARdw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=Uttq6QXxfpMtsaotMm2CdeNTdaxbfQnbJgqUCusVj64=; b=IFOlBfFe9bmGaan9PR9yJoIlwm18VrHUetfzcd0RLzLUaoG+Q8x6SDYf8TdRl9fjiE /wxvlBBQ4GoyISzqYhLElujGw6Wve5rDI4E4iRdK5EQX6Ai8UshQO21BA4m6qjAuKXHj C9il/OlDGdZ7S16Z0Fw0D66YowFt4G+cbIc98bxAzU+5gCrCNJS9C4E8kA2S7/EnAiJZ YRk4JDh+4Wr9BLw3FfL5qz3GlHXnly/KgXxoM1jt+NoVwAajhXoVGbouaqnfn3AdVnN/ slQBz8YK1TA3Jo0e8QhfNt8FK420pa6cRKY081o6zS7W6Nv08keaNU+Lq6sb9VI48Gye I3zA== X-Gm-Message-State: AKaTC016Odm0dGXl2FuMUwX2qCoUTnPghQ/v6MRd+JszWeeNjiARdyWUE89Ot+HVWTbOFtaX X-Received: by 10.28.107.21 with SMTP id g21mr16532793wmc.131.1479742547056; Mon, 21 Nov 2016 07:35:47 -0800 (PST) Received: from boomer.baylibre.com ([90.63.244.31]) by smtp.googlemail.com with ESMTPSA id vr9sm25597909wjc.35.2016.11.21.07.35.46 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 21 Nov 2016 07:35:46 -0800 (PST) From: Jerome Brunet To: netdev@vger.kernel.org, devicetree@vger.kernel.org, Florian Fainelli Subject: [RFC PATCH net v2 1/3] net: phy: add an option to disable EEE advertisement Date: Mon, 21 Nov 2016 16:35:22 +0100 Message-Id: <1479742524-30222-2-git-send-email-jbrunet@baylibre.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1479742524-30222-1-git-send-email-jbrunet@baylibre.com> References: <1479742524-30222-1-git-send-email-jbrunet@baylibre.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20161121_073609_043162_D4EEAECB X-CRM114-Status: GOOD ( 21.16 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Alexandre TORGUE , Neil Armstrong , Martin Blumenstingl , Kevin Hilman , linux-kernel@vger.kernel.org, Andre Roth , linux-amlogic@lists.infradead.org, Carlo Caione , Giuseppe Cavallaro , linux-arm-kernel@lists.infradead.org, Jerome Brunet MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP This patch adds an option to disable EEE advertisement in the generic PHY by providing a mask of prohibited modes corresponding to the value found in the MDIO_AN_EEE_ADV register. On some platforms, PHY Low power idle seems to be causing issues, even breaking the link some cases. The patch provides a convenient way for these platforms to disable EEE advertisement and work around the issue. Signed-off-by: Jerome Brunet --- drivers/net/phy/phy.c | 3 ++ drivers/net/phy/phy_device.c | 80 +++++++++++++++++++++++++++++++++++++++----- include/linux/phy.h | 3 ++ 3 files changed, 77 insertions(+), 9 deletions(-) diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c index f424b867f73e..a44ee14bd953 100644 --- a/drivers/net/phy/phy.c +++ b/drivers/net/phy/phy.c @@ -1348,6 +1348,9 @@ int phy_ethtool_set_eee(struct phy_device *phydev, struct ethtool_eee *data) { int val = ethtool_adv_to_mmd_eee_adv_t(data->advertised); + /* Mask prohibited EEE modes */ + val &= ~phydev->eee_advert_disabled; + phy_write_mmd_indirect(phydev, MDIO_AN_EEE_ADV, MDIO_MMD_AN, val); return 0; diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c index 1a4bf8acad78..74c628e046cb 100644 --- a/drivers/net/phy/phy_device.c +++ b/drivers/net/phy/phy_device.c @@ -1116,6 +1116,43 @@ static int genphy_config_advert(struct phy_device *phydev) } /** + * genphy_config_eee_advert - disable unwanted eee mode advertisement + * @phydev: target phy_device struct + * + * Description: Writes MDIO_AN_EEE_ADV after disabling unsupported energy + * efficent ethernet modes. Returns 0 if the PHY's advertisement hasn't + * changed, and 1 if it has changed. + */ +static int genphy_config_eee_advert(struct phy_device *phydev) +{ + u32 disabled = phydev->eee_advert_disabled; + u32 old_adv, adv; + + /* Nothing to disable */ + if (!disabled) + return 0; + + /* If the following call fails, we assume that EEE is not + * supported by the phy. If we read 0, EEE is not advertised + * In both case, we don't need to continue + */ + adv = phy_read_mmd_indirect(phydev, MDIO_AN_EEE_ADV, MDIO_MMD_AN); + if (adv <= 0) + return 0; + + old_adv = adv; + adv &= ~disabled; + + /* Advertising remains unchanged with the ban */ + if (old_adv == adv) + return 0; + + phy_write_mmd_indirect(phydev, MDIO_AN_EEE_ADV, MDIO_MMD_AN, adv); + + return 1; +} + +/** * genphy_setup_forced - configures/forces speed/duplex from @phydev * @phydev: target phy_device struct * @@ -1173,15 +1210,20 @@ EXPORT_SYMBOL(genphy_restart_aneg); */ int genphy_config_aneg(struct phy_device *phydev) { - int result; + int err, changed; + + changed = genphy_config_eee_advert(phydev); if (AUTONEG_ENABLE != phydev->autoneg) return genphy_setup_forced(phydev); - result = genphy_config_advert(phydev); - if (result < 0) /* error */ - return result; - if (result == 0) { + err = genphy_config_advert(phydev); + if (err < 0) /* error */ + return err; + + changed |= err; + + if (changed == 0) { /* Advertisement hasn't changed, but maybe aneg was never on to * begin with? Or maybe phy was isolated? */ @@ -1191,16 +1233,16 @@ int genphy_config_aneg(struct phy_device *phydev) return ctl; if (!(ctl & BMCR_ANENABLE) || (ctl & BMCR_ISOLATE)) - result = 1; /* do restart aneg */ + changed = 1; /* do restart aneg */ } /* Only restart aneg if we are advertising something different * than we were before. */ - if (result > 0) - result = genphy_restart_aneg(phydev); + if (changed > 0) + return genphy_restart_aneg(phydev); - return result; + return 0; } EXPORT_SYMBOL(genphy_config_aneg); @@ -1558,6 +1600,21 @@ static void of_set_phy_supported(struct phy_device *phydev) __set_phy_supported(phydev, max_speed); } +static void of_set_phy_eee_disable(struct phy_device *phydev) +{ + struct device_node *node = phydev->mdio.dev.of_node; + u32 disabled; + + if (!IS_ENABLED(CONFIG_OF_MDIO)) + return; + + if (!node) + return; + + if (!of_property_read_u32(node, "eee-advert-disable", &disabled)) + phydev->eee_advert_disabled = disabled; +} + /** * phy_probe - probe and init a PHY device * @dev: device to probe and init @@ -1595,6 +1652,11 @@ static int phy_probe(struct device *dev) of_set_phy_supported(phydev); phydev->advertising = phydev->supported; + /* Get the EEE modes we want to prohibit. We will ask + * the PHY stop advertising these mode later on + */ + of_set_phy_eee_disable(phydev); + /* Set the state to READY by default */ phydev->state = PHY_READY; diff --git a/include/linux/phy.h b/include/linux/phy.h index e25f1830fbcf..7f2ea0af16d1 100644 --- a/include/linux/phy.h +++ b/include/linux/phy.h @@ -401,6 +401,9 @@ struct phy_device { u32 advertising; u32 lp_advertising; + /* Energy efficient ethernet modes which should be prohibited */ + u32 eee_advert_disabled; + int autoneg; int link_timeout;