From patchwork Thu Jun 6 14:00:02 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vitor Soares X-Patchwork-Id: 10979599 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 9223F14E5 for ; Thu, 6 Jun 2019 14:00:17 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 77FAD2843B for ; Thu, 6 Jun 2019 14:00:17 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 6BF46284F0; Thu, 6 Jun 2019 14:00:17 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 894732843B for ; Thu, 6 Jun 2019 14:00:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:References: In-Reply-To:Message-Id:Date:Subject:To:From:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=1W0pfFGoUxAC5XbBT0GGMTCF6/voqvMIDKfjBet8g+k=; b=tfZV3AA45dbImvzOzds3XPPV29 AhvjK91n6HEexJx3JS9fm/vdOoV+eJaZLVH0BqjMpZyUrEObuYM6PMZyIpwfVSvgy8u5kO6LEVRx8 U71GDjiFaXogT261+nNFK2tvUixyfR4RUT8j8hJTA7P4C6FWbc51Y8FEDPlz0Iyh2HtRzvtMk6v5G 518oGSOK2liD5TL3NKtqk+HZaXgj+V32fJCqb7qj0u+2I/3lpu1S826mRWpOf2Rev0XQvMlSJzHFq 53yOJuYNqbHZHE3ya2rNxtjI7QTV30w9FnkUFNRresocbW/qzyA2lBssPz9mNtPtHl7rUYixdeMCu 5IQUFH0A==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1hYswB-0004aU-7V; Thu, 06 Jun 2019 14:00:15 +0000 Received: from dc2-smtprelay2.synopsys.com ([198.182.61.142] helo=smtprelay-out1.synopsys.com) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1hYsw9-0004YS-2t for linux-i3c@lists.infradead.org; Thu, 06 Jun 2019 14:00:14 +0000 Received: from mailhost.synopsys.com (mdc-mailhost1.synopsys.com [10.225.0.209]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) (No client certificate requested) by smtprelay-out1.synopsys.com (Postfix) with ESMTPS id 25C51C0B9F; Thu, 6 Jun 2019 13:59:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=synopsys.com; s=mail; t=1559829589; bh=6XGIkYC8pr3tc2Zq6ZaUBCFOv5OZZX8H6H8+9IoAnSQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:In-Reply-To: References:From; b=epaHTtuav4+i5QQdICoqbuS0LTHYQ1U93qVfR8Ii2dDtaMGGHImIVNgmzjaljf6d2 ngU1+FJEv0DfJBLgjA5c2vJjulpcS8ZLypQHDDoEI2rQXPqSIb9S532y4PL+328Obq 2NT7wQBU1Mm4cc5F7lPIN5mboS3jFiL6owHQhVz0m2uK5gJpdz+AlkJ9GN8IrEU+xp vb0wK5s5AaJphx9KC1hYByPt8DXdPbQJ5xlAfLl7ac15AhWrvI86HfW6ansGLtlmQi mMUK4XcBKNj/1PPYzCDvLcJC9sLqswtBQIdbv90f/4VlFURih6f4ACfIzKTpeIcBz7 OVIbI/o6MokJg== Received: from de02.synopsys.com (de02.internal.synopsys.com [10.225.17.21]) by mailhost.synopsys.com (Postfix) with ESMTP id D484EA0057; Thu, 6 Jun 2019 14:00:08 +0000 (UTC) Received: from de02dwia024.internal.synopsys.com (de02dwia024.internal.synopsys.com [10.225.19.81]) by de02.synopsys.com (Postfix) with ESMTP id C35D43F6D1; Thu, 6 Jun 2019 16:00:08 +0200 (CEST) From: Vitor Soares To: linux-i3c@lists.infradead.org Subject: [PATCH v2 2/3] i3c: add mixed limited bus mode Date: Thu, 6 Jun 2019 16:00:02 +0200 Message-Id: <47db801ee13bd7a831c1cc24353653ea0ddd3721.1559821228.git.vitor.soares@synopsys.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: References: In-Reply-To: References: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190606_070013_138229_7307278A X-CRM114-Status: GOOD ( 12.74 ) X-BeenThere: linux-i3c@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: Linux I3C List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Joao.Pinto@synopsys.com, Boris Brezillon , linux-kernel@vger.kernel.org, Vitor Soares MIME-Version: 1.0 Sender: "linux-i3c" Errors-To: linux-i3c-bounces+linux-i3c=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP The i3c bus spec defines a bus configuration where i2c devices don't have a 50ns filter but support SCL running at SDR max rate (12.5MHz). This patch introduces the limited bus mode so that users can use a higher speed in presence of i2c devices index 1. Signed-off-by: Vitor Soares Cc: Boris Brezillon Cc: --- Changes in v2: Enhance commit message drivers/i3c/master.c | 5 +++++ include/linux/i3c/master.h | 5 +++++ 2 files changed, 10 insertions(+) diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c index 8cd5824..f446c4d 100644 --- a/drivers/i3c/master.c +++ b/drivers/i3c/master.c @@ -470,6 +470,7 @@ static int i3c_bus_init(struct i3c_bus *i3cbus) static const char * const i3c_bus_mode_strings[] = { [I3C_BUS_MODE_PURE] = "pure", [I3C_BUS_MODE_MIXED_FAST] = "mixed-fast", + [I3C_BUS_MODE_MIXED_LIMITED] = "mixed-limited", [I3C_BUS_MODE_MIXED_SLOW] = "mixed-slow", }; @@ -585,6 +586,7 @@ int i3c_bus_set_mode(struct i3c_bus *i3cbus, enum i3c_bus_mode mode, i3cbus->scl_rate.i3c = I3C_BUS_TYP_I3C_SCL_RATE; break; case I3C_BUS_MODE_MIXED_FAST: + case I3C_BUS_MODE_MIXED_LIMITED: if (!i3cbus->scl_rate.i3c) i3cbus->scl_rate.i3c = I3C_BUS_TYP_I3C_SCL_RATE; if (!i3cbus->scl_rate.i2c) @@ -2490,6 +2492,9 @@ int i3c_master_register(struct i3c_master_controller *master, mode = I3C_BUS_MODE_MIXED_FAST; break; case I3C_LVR_I2C_INDEX(1): + if (mode < I3C_BUS_MODE_MIXED_LIMITED) + mode = I3C_BUS_MODE_MIXED_LIMITED; + break; case I3C_LVR_I2C_INDEX(2): if (mode < I3C_BUS_MODE_MIXED_SLOW) mode = I3C_BUS_MODE_MIXED_SLOW; diff --git a/include/linux/i3c/master.h b/include/linux/i3c/master.h index f13fd8b..89ea461 100644 --- a/include/linux/i3c/master.h +++ b/include/linux/i3c/master.h @@ -250,12 +250,17 @@ struct i3c_device { * the bus. The only impact in this mode is that the * high SCL pulse has to stay below 50ns to trick I2C * devices when transmitting I3C frames + * @I3C_BUS_MODE_MIXED_LIMITED: I2C devices without 50ns spike filter are + * present on the bus. However they allows + * compliance up to the maximum SDR SCL clock + * frequency. * @I3C_BUS_MODE_MIXED_SLOW: I2C devices without 50ns spike filter are present * on the bus */ enum i3c_bus_mode { I3C_BUS_MODE_PURE, I3C_BUS_MODE_MIXED_FAST, + I3C_BUS_MODE_MIXED_LIMITED, I3C_BUS_MODE_MIXED_SLOW, };