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 X-Spam-Level: X-Spam-Status: No, score=-12.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0B4C5C4363D for ; Thu, 24 Sep 2020 16:45:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9E6812068D for ; Thu, 24 Sep 2020 16:45:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727988AbgIXQp4 (ORCPT ); Thu, 24 Sep 2020 12:45:56 -0400 Received: from youngberry.canonical.com ([91.189.89.112]:36120 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726477AbgIXQp4 (ORCPT ); Thu, 24 Sep 2020 12:45:56 -0400 Received: from 61-220-137-37.hinet-ip.hinet.net ([61.220.137.37] helo=localhost) by youngberry.canonical.com with esmtpsa (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.86_2) (envelope-from ) id 1kLUNO-0004kM-Aw; Thu, 24 Sep 2020 16:45:46 +0000 From: Kai-Heng Feng To: jeffrey.t.kirsher@intel.com Cc: andrew@lunn.ch, Kai-Heng Feng , "David S. Miller" , Jakub Kicinski , intel-wired-lan@lists.osuosl.org (moderated list:INTEL ETHERNET DRIVERS), netdev@vger.kernel.org (open list:NETWORKING DRIVERS), linux-kernel@vger.kernel.org (open list) Subject: [PATCH v3] e1000e: Increase iteration on polling MDIC ready bit Date: Fri, 25 Sep 2020 00:45:42 +0800 Message-Id: <20200924164542.19906-1-kai.heng.feng@canonical.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200924150958.18016-1-kai.heng.feng@canonical.com> References: <20200924150958.18016-1-kai.heng.feng@canonical.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org We are seeing the following error after S3 resume: [ 704.746874] e1000e 0000:00:1f.6 eno1: Setting page 0x6020 [ 704.844232] e1000e 0000:00:1f.6 eno1: MDI Write did not complete [ 704.902817] e1000e 0000:00:1f.6 eno1: Setting page 0x6020 [ 704.903075] e1000e 0000:00:1f.6 eno1: reading PHY page 769 (or 0x6020 shifted) reg 0x17 [ 704.903281] e1000e 0000:00:1f.6 eno1: Setting page 0x6020 [ 704.903486] e1000e 0000:00:1f.6 eno1: writing PHY page 769 (or 0x6020 shifted) reg 0x17 [ 704.943155] e1000e 0000:00:1f.6 eno1: MDI Error ... [ 705.108161] e1000e 0000:00:1f.6 eno1: Hardware Error As Andrew Lunn pointed out, MDIO has nothing to do with phy, and indeed increase polling iteration can resolve the issue. The root cause is quite likely Intel ME, since it's a blackbox to the kernel so the only approach we can take is to be patient and wait longer. Signed-off-by: Kai-Heng Feng --- v3: - Moving delay to end of loop doesn't save anytime, move it back. - Point out this is quitely likely caused by Intel ME. v2: - Increase polling iteration instead of powering down the phy. drivers/net/ethernet/intel/e1000e/phy.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/ethernet/intel/e1000e/phy.c b/drivers/net/ethernet/intel/e1000e/phy.c index e11c877595fb..e6d4acd90937 100644 --- a/drivers/net/ethernet/intel/e1000e/phy.c +++ b/drivers/net/ethernet/intel/e1000e/phy.c @@ -203,7 +203,7 @@ s32 e1000e_write_phy_reg_mdic(struct e1000_hw *hw, u32 offset, u16 data) * Increasing the time out as testing showed failures with * the lower time out */ - for (i = 0; i < (E1000_GEN_POLL_TIMEOUT * 3); i++) { + for (i = 0; i < (E1000_GEN_POLL_TIMEOUT * 10); i++) { udelay(50); mdic = er32(MDIC); if (mdic & E1000_MDIC_READY) -- 2.17.1