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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A3704C433EF for ; Wed, 19 Jan 2022 10:51:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1353911AbiASKv6 (ORCPT ); Wed, 19 Jan 2022 05:51:58 -0500 Received: from smtp-out2.suse.de ([195.135.220.29]:40304 "EHLO smtp-out2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1346702AbiASKv5 (ORCPT ); Wed, 19 Jan 2022 05:51:57 -0500 Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out2.suse.de (Postfix) with ESMTPS id ACA1A1F384; Wed, 19 Jan 2022 10:51:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1642589516; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=kpTi7Guq+O1/U4zg2a4aglEet/VVuL7ggzH963MgAXk=; b=kMtf+vbt+KEHC8JNH4nZRhVcBpMyD6L9uYcjfvUa3r4HWTscHA149Jjt3b7nOdMZac5g9y 374BhbkufFhaQs+Plnu7PaCWMBJaDvRUx3/QyOHl6vkNqfa1VJWqQHzAD4/hb7YaXFSG/g oJGd2MIIv1lc9Vt87BDBwu9W6siSHag= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1642589516; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=kpTi7Guq+O1/U4zg2a4aglEet/VVuL7ggzH963MgAXk=; b=XUK/x3TEpdvhM8oyoqxBmHrj0sm4BsDTpe8egbcj+yJXFSCCvZOw3DJv2y6AeT60HMUtgo pElqKDcoeOWrPUCA== Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id 605FB13B3D; Wed, 19 Jan 2022 10:51:56 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id yyNKFEzt52GcVQAAMHmgww (envelope-from ); Wed, 19 Jan 2022 10:51:56 +0000 Date: Wed, 19 Jan 2022 11:51:54 +0100 From: Jean Delvare To: Jon P Cc: linux-i2c@vger.kernel.org, Adam Honse , Terry Bowman Subject: Re: i2c-tools does not work with AMD Cezanne APU's Message-ID: <20220119115154.1ee789e9@endymion> In-Reply-To: References: Organization: SUSE Linux X-Mailer: Claws Mail 3.18.0 (GTK+ 2.24.32; x86_64-suse-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org Hi Jon, On Tue, 18 Jan 2022 17:26:03 -0800, Jon P wrote: > After updating to a 5700G APU from a 2400G on my B450 board I am not > able to access i2c interfaces which is a blocking issue to use OpenRGB > on the DRAM and motherboard RGB controller (I am one of the developers > of OpenRGB). >=20 > I have opened an issue with the distribution that I am using and > multiple other users are seeing the same issue but I have not seen any > updates on the issue or request for more details so I am afraid that > it has just gone into the void. Full details here: > https://bugs.launchpad.net/bugs/1950062 >=20 > I see the same issues when using the i2c-tools as well when I am > trying to read the DRAM so following the man page I would like to > report a bug using the i2c-tools with AMD Cezanne APU's. =46rom your logs, the i2c bus itself is not working. So this is definitely not an i2c-tools issue, but a kernel driver issue. Most likely this is related to the required change of register access method for recent AMD chipsets which has been discussed recently: https://lore.kernel.org/linux-i2c/20220118221152.300444-1-terry.bowman@amd.= com/T/#t --=20 Jean Delvare SUSE L3 Support