From patchwork Wed Jun 19 18:36:32 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vitor Soares X-Patchwork-Id: 11005029 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 2BD9D924 for ; Wed, 19 Jun 2019 18:36:56 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 17C2728686 for ; Wed, 19 Jun 2019 18:36:56 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 0C11728689; Wed, 19 Jun 2019 18:36:56 +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 5DB6928688 for ; Wed, 19 Jun 2019 18:36:54 +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=1pJWGcr0DiBI0oomeC1zbOJmWAYdkEyoFR+szNnXr3k=; b=lBxH0o5EeJCV4TfLtPqYltx9nI hh3Lc3HMXphrA5wK7It26wL/At1x104TvuFbzqy1CzcF7lGFNrpidyzW7v+PpKB/vncSKuSYjkvuR Ou+cssEvZ+VfOrqAADsrc01NkKZWCAVVdLsVwbklH2pCXCdJAI3O6e3EIoZdCo87SF1qjUNT3KKML w89jmVpKn6EPvpdYONoyalBo5stphYVyvyQ2jDi8K4omF9MK3RcXuQPQq9lbgRfXF2RF7Y5fulZxU OfArKOO6+kNSwu0Wxwx/jL6yCXu3FRFV7lxfWZXThGikpx7YFP0seVGUs/GMTUHtqd13YhmKZHB07 JUybgEbA==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1hdfS2-0005x7-0n; Wed, 19 Jun 2019 18:36:54 +0000 Received: from dc2-smtprelay2.synopsys.com ([198.182.61.142] helo=smtprelay-out1.synopsys.com) by bombadil.infradead.org with esmtps (Exim 4.92 #3 (Red Hat Linux)) id 1hdfRy-0005uh-9d for linux-i3c@lists.infradead.org; Wed, 19 Jun 2019 18:36:53 +0000 Received: from mailhost.synopsys.com (unknown [10.225.0.210]) (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 45863C00ED; Wed, 19 Jun 2019 18:36:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=synopsys.com; s=mail; t=1560969408; bh=HFU+VROCK0C6D+QU6j2ekGDFt1Sva007823auZeHX7Q=; h=From:To:Cc:Subject:Date:In-Reply-To:References:In-Reply-To: References:From; b=U90JMlzaF68mn6cNmL1fAgyYwzttuEXxtTYVHy6XI3r+YW2LO9ZYVgaboerGOuyNx hsF5QGJWI2ihFvVzwAoXhf8umkIyS3uvZg6xaxjxVkgz4JqZTI7gNAKupXX5DMTfUS 8p8pbW7/Q3pr6Hv5S1qUIDhaF3ryI/bEqHc66HjRKzNsYqOJvBI3K3O3uThJ9gMfcM IIj7wmeRbjZG01/oUJwOVAAlFORC4CTtEAOvgYHhUhF1DKp9GT2n95+CDJx7boeraI Tc/TjzGXwWvQshIeaoaKb+4uzu3BIaz1tRqgRfy63CJktj1xXWog3S6YMf4UjPEtNy G+kcjVaa0w7Hg== Received: from de02.synopsys.com (de02.internal.synopsys.com [10.225.17.21]) by mailhost.synopsys.com (Postfix) with ESMTP id C7598A0231; Wed, 19 Jun 2019 18:36:45 +0000 (UTC) Received: from de02dwia024.internal.synopsys.com (de02dwia024.internal.synopsys.com [10.225.19.81]) by de02.synopsys.com (Postfix) with ESMTP id A020A3F217; Wed, 19 Jun 2019 20:36:45 +0200 (CEST) From: Vitor Soares To: linux-i3c@lists.infradead.org, Joao.Pinto@synopsys.com Subject: [PATCH v4 2/3] i3c: add mixed limited bus mode Date: Wed, 19 Jun 2019 20:36:32 +0200 Message-Id: <4627348638396c6b3fbe3ee28b533ca15ea9f4fe.1560968688.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-20190619_113650_357376_F4911502 X-CRM114-Status: GOOD ( 12.39 ) X-BeenThere: linux-i3c@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux I3C List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: 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 v4: None Changes in v3: None 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 14980db..76549f1 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) @@ -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 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, };