From patchwork Mon Apr 15 18:46:42 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vitor Soares X-Patchwork-Id: 10901391 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 E065017E6 for ; Mon, 15 Apr 2019 18:46:57 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C56FC288DD for ; Mon, 15 Apr 2019 18:46:57 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id BA06B288E6; Mon, 15 Apr 2019 18:46:57 +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 56F3B28681 for ; Mon, 15 Apr 2019 18:46:57 +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=f5E9Pszq0QE587QjJqLya5zkldSfh8hS5O+2vnElUME=; b=kgjUSNVlEQ1h2+3czBuB5UUsHQ a+P4MjKh4cv+Pi+W2wBKO5nTybbAY2BRZm7Vr/j29zw6V6a3lUmKcJrsa1Lwdk25EmaH0xD/SeiSM 9pEHP872Xx9z0xYJrR3qSGjssUOa0p176e8wxnQmstd7V39H0IF8pjIhX6+PHjAjsi5vLoZcjK/+J ORkSNios94Xoe25SnE/kfJH4H0rzGLZuAlffWFwu4tP0K/FSRN/ghDvU5mAqK/awKUXM06WnaNASS 2FBDiRwtWTTFkWKS7ZOoIoTeZo2O+95looe1vfwuLbJ2p3I1m0Z4XFO8t8ZvKI6Lv5w6j22X+Wfj2 lV1WLLTg==; 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 1hG6d6-0003vU-VT; Mon, 15 Apr 2019 18:46:56 +0000 Received: from smtprelay.synopsys.com ([198.182.60.111]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1hG6d3-0003u4-PF for linux-i3c@lists.infradead.org; Mon, 15 Apr 2019 18:46:55 +0000 Received: from mailhost1.synopsys.com (mailhost1.synopsys.com [10.12.238.239]) by smtprelay.synopsys.com (Postfix) with ESMTP id F26BD10C1084; Mon, 15 Apr 2019 11:46:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=synopsys.com; s=mail; t=1555354011; bh=n6inYUl0YHNqBHgFN/exfZfs4AjaXGG9AEqyDA7rheA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:In-Reply-To: References:From; b=QpHKQExWp3HSwvCwZXncuLsmdtCh2MQEaJaSugUeYLVOSYURwQVR1QA1sqJJUh+zf MXeEwMIywkkCMI+TFz+gsJFQdbLRZv04ZfqvyZQLYlEv3Id9iWF8TZbeHb5RM9UsBG D+BwF7fRuwhfeh9faRHmILIwpPTcqL7eTu3e5ZWNGw9rjALwt59jK2wWgLOFq/nc78 +6hf5wGP5pZngNIc+3gaGjIwyBYh4p42i5nIhEkJ9bYNMsMVGKEPzjICBK0wm9o2aX l+YCO+QYPv0hC81OsBo3i9eIQ219Lr+2BgBXaM8d/ekXsnhaIRCcvqpzl1FdUJ/wfO BFFe0XEolDKVQ== Received: from de02dwia024.internal.synopsys.com (de02dwia024.internal.synopsys.com [10.225.19.81]) by mailhost1.synopsys.com (Postfix) with ESMTP id AF22E5B73; Mon, 15 Apr 2019 11:46:49 -0700 (PDT) From: Vitor Soares To: linux-i3c@lists.infradead.org Subject: [PATCH 2/3] i3c: add mixed limited bus mode Date: Mon, 15 Apr 2019 20:46:42 +0200 Message-Id: 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-20190415_114653_876609_61357797 X-CRM114-Status: GOOD ( 11.87 ) 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 define a bus configuration where the i2c devices doesn't have the 50ns filter yet they allow the SDR max speed. This patch introduce the limited bus mode so the users can use a higher speed on presence of i2c devices index 1. Signed-off-by: Vitor Soares Cc: Boris Brezillon Cc: --- 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 1c4a86a..46d3774 100644 --- a/drivers/i3c/master.c +++ b/drivers/i3c/master.c @@ -463,6 +463,7 @@ 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", }; @@ -575,6 +576,7 @@ 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) @@ -2481,6 +2483,9 @@ 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 44fb3cf..740235e 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, };