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=-11.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,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 0A2BFC43468 for ; Mon, 21 Sep 2020 16:47:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C3714238A1 for ; Mon, 21 Sep 2020 16:47:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1600706857; bh=2rs8eb9EJlhp2pZtnu8luvIlNE/S4asWeLrkFEF6i3w=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=hJ9Iq1V+uX2PSBdESnSw7vKHdi1jKpJYTVPEMWXlxKyrh/G+0wihAe6XZJp/2s27V 1qVGsDjgB9Xjj9uKyw/39+7/yMqqt/FKNZY2pUhB0TtO/qOQtMCz5rJfd9ogRgENv9 grYrI947OKYcFpjJd4u60GPacA7VUDWJzsb0bB7k= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729695AbgIUQrg (ORCPT ); Mon, 21 Sep 2020 12:47:36 -0400 Received: from mail.kernel.org ([198.145.29.99]:54510 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728576AbgIUQre (ORCPT ); Mon, 21 Sep 2020 12:47:34 -0400 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 66E282223E; Mon, 21 Sep 2020 16:47:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1600706852; bh=2rs8eb9EJlhp2pZtnu8luvIlNE/S4asWeLrkFEF6i3w=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=YFboQbRH92A4qo6fMHO3oxX3jbOKQk9daKbqGo3SJuot1gZfupHp/zsju9fRb5s9V NJ+83UqcsOw61s9z40WdBIe36AP5Rj1y2necPBh/f79WNw7dhVRRr81a2nfOcf5u0t QFdEca7dDfvJ7NbLjQcZLH6z8eTNOMsU8uNCYdU4= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, =?UTF-8?q?Volker=20R=C3=BCmelin?= , Jean Delvare , Wolfram Sang Subject: [PATCH 5.8 091/118] i2c: i801: Fix resume bug Date: Mon, 21 Sep 2020 18:28:23 +0200 Message-Id: <20200921162040.586151198@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200921162036.324813383@linuxfoundation.org> References: <20200921162036.324813383@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Volker Rümelin commit 66d402e2e9455cf0213c42b97f22a0493372d7cc upstream. On suspend the original host configuration gets restored. The resume routine has to undo this, otherwise the SMBus master may be left in disabled state or in i2c mode. [JD: Rebased on v5.8, moved the write into i801_setup_hstcfg.] Signed-off-by: Volker Rümelin Signed-off-by: Jean Delvare Signed-off-by: Wolfram Sang Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman --- drivers/i2c/busses/i2c-i801.c | 21 ++++++++++++++------- 1 file changed, 14 insertions(+), 7 deletions(-) --- a/drivers/i2c/busses/i2c-i801.c +++ b/drivers/i2c/busses/i2c-i801.c @@ -1706,6 +1706,16 @@ static inline int i801_acpi_probe(struct static inline void i801_acpi_remove(struct i801_priv *priv) { } #endif +static unsigned char i801_setup_hstcfg(struct i801_priv *priv) +{ + unsigned char hstcfg = priv->original_hstcfg; + + hstcfg &= ~SMBHSTCFG_I2C_EN; /* SMBus timing */ + hstcfg |= SMBHSTCFG_HST_EN; + pci_write_config_byte(priv->pci_dev, SMBHSTCFG, hstcfg); + return hstcfg; +} + static int i801_probe(struct pci_dev *dev, const struct pci_device_id *id) { unsigned char temp; @@ -1826,14 +1836,10 @@ static int i801_probe(struct pci_dev *de return err; } - pci_read_config_byte(priv->pci_dev, SMBHSTCFG, &temp); - priv->original_hstcfg = temp; - temp &= ~SMBHSTCFG_I2C_EN; /* SMBus timing */ - if (!(temp & SMBHSTCFG_HST_EN)) { + pci_read_config_byte(priv->pci_dev, SMBHSTCFG, &priv->original_hstcfg); + temp = i801_setup_hstcfg(priv); + if (!(priv->original_hstcfg & SMBHSTCFG_HST_EN)) dev_info(&dev->dev, "Enabling SMBus device\n"); - temp |= SMBHSTCFG_HST_EN; - } - pci_write_config_byte(priv->pci_dev, SMBHSTCFG, temp); if (temp & SMBHSTCFG_SMB_SMI_EN) { dev_dbg(&dev->dev, "SMBus using interrupt SMI#\n"); @@ -1959,6 +1965,7 @@ static int i801_resume(struct device *de { struct i801_priv *priv = dev_get_drvdata(dev); + i801_setup_hstcfg(priv); i801_enable_host_notify(&priv->adapter); return 0;