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=-5.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,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 02C8FECE563 for ; Mon, 17 Sep 2018 22:49:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B7CE02088F for ; Mon, 17 Sep 2018 22:49:50 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B7CE02088F Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linuxfoundation.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728758AbeIRETM (ORCPT ); Tue, 18 Sep 2018 00:19:12 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:44678 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726759AbeIRETM (ORCPT ); Tue, 18 Sep 2018 00:19:12 -0400 Received: from localhost (li1825-44.members.linode.com [172.104.248.44]) by mail.linuxfoundation.org (Postfix) with ESMTPSA id 91B5BCAD; Mon, 17 Sep 2018 22:49:46 +0000 (UTC) From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Srinivas Pandruvada , "Rafael J. Wysocki" , Hans de Goede , Tejun Heo , Sasha Levin Subject: [PATCH 4.4 29/56] ata: libahci: Correct setting of DEVSLP register Date: Tue, 18 Sep 2018 00:42:02 +0200 Message-Id: <20180917213829.144051215@linuxfoundation.org> X-Mailer: git-send-email 2.19.0 In-Reply-To: <20180917213827.913122591@linuxfoundation.org> References: <20180917213827.913122591@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Srinivas Pandruvada [ Upstream commit 2dbb3ec29a6c069035857a2fc4c24e80e5dfe3cc ] We have seen that on some platforms, SATA device never show any DEVSLP residency. This prevent power gating of SATA IP, which prevent system to transition to low power mode in systems with SLP_S0 aka modern standby systems. The PHY logic is off only in DEVSLP not in slumber. Reference: https://www.intel.com/content/dam/www/public/us/en/documents/datasheets /332995-skylake-i-o-platform-datasheet-volume-1.pdf Section 28.7.6.1 Here driver is trying to do read-modify-write the devslp register. But not resetting the bits for which this driver will modify values (DITO, MDAT and DETO). So simply reset those bits before updating to new values. Signed-off-by: Srinivas Pandruvada Reviewed-by: Rafael J. Wysocki Reviewed-by: Hans de Goede Signed-off-by: Tejun Heo Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- drivers/ata/libahci.c | 2 ++ 1 file changed, 2 insertions(+) --- a/drivers/ata/libahci.c +++ b/drivers/ata/libahci.c @@ -2113,6 +2113,8 @@ static void ahci_set_aggressive_devslp(s deto = 20; } + /* Make dito, mdat, deto bits to 0s */ + devslp &= ~GENMASK_ULL(24, 2); devslp |= ((dito << PORT_DEVSLP_DITO_OFFSET) | (mdat << PORT_DEVSLP_MDAT_OFFSET) | (deto << PORT_DEVSLP_DETO_OFFSET) |