From patchwork Mon Dec 5 15:33:28 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Claudiu Beznea X-Patchwork-Id: 13064675 X-Patchwork-Delegate: kuba@kernel.org 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A039DC4321E for ; Mon, 5 Dec 2022 15:31:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232849AbiLEPbJ (ORCPT ); Mon, 5 Dec 2022 10:31:09 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35506 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232724AbiLEPar (ORCPT ); Mon, 5 Dec 2022 10:30:47 -0500 Received: from esa.microchip.iphmx.com (esa.microchip.iphmx.com [68.232.154.123]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C825BE78; Mon, 5 Dec 2022 07:29:42 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=microchip.com; i=@microchip.com; q=dns/txt; s=mchp; t=1670254182; x=1701790182; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=CTju6p3lEQWouZLK24Wd4h6927YMxUYLWgbCTRU7lrk=; b=faemkw3LRsYUBpYjJmp86x0LkskVbWJJE2HcxiPKpxcraaJPs8aFWcEq mt9H4/V4YGNRzRumHcyqEspcud9SbcrBHJ0wskXDEfEbui8k3Gp1+NFQS NVkHyzVJo/kou15eW8LnLGGZ+Haor86JiCg9rHG3AjZ6jCVRO9z36+ZxP jAXoIa3amZRoYo3aBNVuWI8IMhmJnvXi8fu6Y7XsSOeuHizx8CXVleSFt H1R/LqEK1BFKfpQVm08o9yfH6XoISPcNz2AUDHRzRQzkFxz+Uli+DT22y EYNkIFIqSRQe3jXN9elQ+j5+hHvpqjqYOOcycf0Jt9R8fVxIrWIsc2OpJ g==; X-IronPort-AV: E=Sophos;i="5.96,219,1665471600"; d="scan'208";a="190082671" Received: from unknown (HELO email.microchip.com) ([170.129.1.10]) by esa2.microchip.iphmx.com with ESMTP/TLS/AES256-SHA256; 05 Dec 2022 08:29:41 -0700 Received: from chn-vm-ex03.mchp-main.com (10.10.85.151) by chn-vm-ex01.mchp-main.com (10.10.85.143) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.12; Mon, 5 Dec 2022 08:29:39 -0700 Received: from localhost.localdomain (10.10.115.15) by chn-vm-ex03.mchp-main.com (10.10.85.151) with Microsoft SMTP Server id 15.1.2507.12 via Frontend Transport; Mon, 5 Dec 2022 08:29:37 -0700 From: Claudiu Beznea To: , , , , , , , CC: , , , Claudiu Beznea Subject: [PATCH 2/2] net: macb: fix connectivity after resume Date: Mon, 5 Dec 2022 17:33:28 +0200 Message-ID: <20221205153328.503576-3-claudiu.beznea@microchip.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20221205153328.503576-1-claudiu.beznea@microchip.com> References: <20221205153328.503576-1-claudiu.beznea@microchip.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org Commit bf0ad1893442 ("net: macb: Specify PHY PM management done by MAC") signals to PHY layer that the PHY PM management is done by the MAC driver itself. In case this is done the mdio_bus_phy_suspend() and mdio_bus_phy_resume() will return just at its beginning letting the MAC driver to handle the PHY power management. AT91 devices (e.g. SAMA7G5, SAMA5D2) has a special power saving mode called backup and self-refresh where most of the SoCs parts are shutdown on suspend and RAM is switched to self-refresh. The rail powering the on-board ethernet PHY could also be closed. For scenarios where backup and self-refresh is used the MACB driver needs to re-initialize the PHY device itself when resuming. Otherwise there is poor or missing connectivity (e.g. SAMA7G5-EK uses KSZ9131 in RGMII mode which needs its DLL settings to satisfy RGMII timings). For this phylink_init_phydev() has been called on resume path before phylink_start(). Up to commit bf0ad1893442 ("net: macb: Specify PHY PM management done by MAC") this has been handled by mdio_bus_phy_resume(). This has been tested on SAMA7G5-EK (with KSZ9131 and KSZ8081 PHYs), on SAMA5D2 (with KSZ8081 PHY), on SAM9X60 (with KSZ8081 PHY). Fixes: bf0ad1893442 ("net: macb: Specify PHY PM management done by MAC") Signed-off-by: Claudiu Beznea --- This patch depends on patch 1/2 from this series. For proper backporting to older kernel (in case this series is integrated as is) please add the Depends-on tag on this patch after patch 1/2 is integrated in networking tree. Thank you, Claudiu Beznea drivers/net/ethernet/cadence/macb_main.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c index 95667b979fab..8baa53706721 100644 --- a/drivers/net/ethernet/cadence/macb_main.c +++ b/drivers/net/ethernet/cadence/macb_main.c @@ -5238,6 +5238,7 @@ static int __maybe_unused macb_resume(struct device *dev) if (!device_may_wakeup(&bp->dev->dev)) phy_init(bp->sgmii_phy); + phylink_init_phydev(bp->phylink); phylink_start(bp->phylink); rtnl_unlock();