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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 49805C433E0 for ; Thu, 18 Jun 2020 01:19:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 199D5206F1 for ; Thu, 18 Jun 2020 01:19:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592443196; bh=oRtI3EK4vwV1BYLrXFSQDXPl5jMD+2koWknO8vkCueY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=K8xTlBIgTjQ7EpZkZ5G/n3UDRlPEHrFck9I4jje+azTuQtxVS88U5l/CwsGl/wnVW 6ufviOyvgBVC7etT+qd2ZxxLptOz/NuDvtn4K96VzFrDJ5GGbGgjnc/pIiXFznhysM SJl2VONSHmXuF63XcrmQHUQwUvxsurRm+aZ0D+Bk= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728363AbgFRBTv (ORCPT ); Wed, 17 Jun 2020 21:19:51 -0400 Received: from mail.kernel.org ([198.145.29.99]:47452 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729607AbgFRBQh (ORCPT ); Wed, 17 Jun 2020 21:16:37 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 63058221ED; Thu, 18 Jun 2020 01:16:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592442997; bh=oRtI3EK4vwV1BYLrXFSQDXPl5jMD+2koWknO8vkCueY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=2d3tiaimSQoXmVd9KKs/9SZJOleBsGMELi/s5dGJ0DyVqxZs7MPdBbexWH8ktBBub mJAnLqJRuB8KUfGwIIBkVUz4UWNeYDQzc27Y/3/YmH/jSenpsM/sSOTjEF/yLPAkj5 eowAv5n+HNN97EPl3k9oOW9M6MhZHtN5zzJ44rHc= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Adam Honse , Jean Delvare , Sebastian Reichel , Wolfram Sang , Sasha Levin , linux-i2c@vger.kernel.org Subject: [PATCH AUTOSEL 5.4 004/266] i2c: piix4: Detect secondary SMBus controller on AMD AM4 chipsets Date: Wed, 17 Jun 2020 21:12:09 -0400 Message-Id: <20200618011631.604574-4-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200618011631.604574-1-sashal@kernel.org> References: <20200618011631.604574-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Adam Honse [ Upstream commit f27237c174fd9653033330e4e532cd9d153ce824 ] The AMD X370 and other AM4 chipsets (A/B/X 3/4/5 parts) and Threadripper equivalents have a secondary SMBus controller at I/O port address 0x0B20. This bus is used by several manufacturers to control motherboard RGB lighting via embedded controllers. I have been using this bus in my OpenRGB project to control the Aura RGB on many motherboards and ASRock also uses this bus for their Polychrome RGB controller. I am not aware of any CZ-compatible platforms which do not have the second SMBus channel. All of AMD's AM4- and Threadripper- series chipsets that OpenRGB users have tested appear to have this secondary bus. I also noticed this secondary bus is present on older AMD platforms including my FM1 home server. Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=202587 Signed-off-by: Adam Honse Reviewed-by: Jean Delvare Reviewed-by: Sebastian Reichel Tested-by: Sebastian Reichel Signed-off-by: Wolfram Sang Signed-off-by: Sasha Levin --- drivers/i2c/busses/i2c-piix4.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/i2c/busses/i2c-piix4.c b/drivers/i2c/busses/i2c-piix4.c index 30ded6422e7b..69740a4ff1db 100644 --- a/drivers/i2c/busses/i2c-piix4.c +++ b/drivers/i2c/busses/i2c-piix4.c @@ -977,7 +977,8 @@ static int piix4_probe(struct pci_dev *dev, const struct pci_device_id *id) } if (dev->vendor == PCI_VENDOR_ID_AMD && - dev->device == PCI_DEVICE_ID_AMD_HUDSON2_SMBUS) { + (dev->device == PCI_DEVICE_ID_AMD_HUDSON2_SMBUS || + dev->device == PCI_DEVICE_ID_AMD_KERNCZ_SMBUS)) { retval = piix4_setup_sb800(dev, id, 1); } -- 2.25.1