From patchwork Thu Nov 19 15:56:51 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wolfram Sang X-Patchwork-Id: 7658641 X-Patchwork-Delegate: geert@linux-m68k.org Return-Path: X-Original-To: patchwork-linux-sh@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 4827CC05CA for ; Thu, 19 Nov 2015 15:57:10 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 3F3092067D for ; Thu, 19 Nov 2015 15:57:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 57B7620676 for ; Thu, 19 Nov 2015 15:57:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934492AbbKSP5F (ORCPT ); Thu, 19 Nov 2015 10:57:05 -0500 Received: from sauhun.de ([89.238.76.85]:36962 "EHLO pokefinder.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934486AbbKSP5D (ORCPT ); Thu, 19 Nov 2015 10:57:03 -0500 Received: from p4fe2557f.dip0.t-ipconnect.de ([79.226.85.127]:52516 helo=localhost) by pokefinder.org with esmtpsa (TLS1.2:RSA_AES_128_CBC_SHA1:128) (Exim 4.80) (envelope-from ) id 1ZzRa2-0003hp-1r; Thu, 19 Nov 2015 16:57:02 +0100 From: Wolfram Sang To: linux-i2c@vger.kernel.org Cc: linux-sh@vger.kernel.org, Magnus Damm , Simon Horman , Laurent Pinchart , Geert Uytterhoeven , Wolfram Sang , Kuninori Morimoto , Yoshihiro Shimoda Subject: [PATCH v3 11/11] i2c: rcar: handle difference in setting up non-first message Date: Thu, 19 Nov 2015 16:56:51 +0100 Message-Id: <1447948611-2615-12-git-send-email-wsa@the-dreams.de> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1447948611-2615-1-git-send-email-wsa@the-dreams.de> References: <1447948611-2615-1-git-send-email-wsa@the-dreams.de> Sender: linux-sh-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-sh@vger.kernel.org X-Spam-Status: No, score=-7.5 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Signed-off-by: Ryo Kataoka Signed-off-by: Hiromitsu Yamasaki Signed-off-by: Wolfram Sang --- drivers/i2c/busses/i2c-rcar.c | 21 ++++++++++++++++----- 1 file changed, 16 insertions(+), 5 deletions(-) diff --git a/drivers/i2c/busses/i2c-rcar.c b/drivers/i2c/busses/i2c-rcar.c index e71fd4090247aa..3ed1f0aa5eeb16 100644 --- a/drivers/i2c/busses/i2c-rcar.c +++ b/drivers/i2c/busses/i2c-rcar.c @@ -92,6 +92,7 @@ #define RCAR_IRQ_ACK_RECV (~(MAT | MDR) & 0xFF) #define ID_LAST_MSG (1 << 0) +#define ID_FIRST_MSG (1 << 1) #define ID_DONE (1 << 2) #define ID_ARBLOST (1 << 3) #define ID_NACK (1 << 4) @@ -254,13 +255,22 @@ static void rcar_i2c_prepare_msg(struct rcar_i2c_priv *priv) int read = !!rcar_i2c_is_recv(priv); priv->pos = 0; - priv->flags = 0; if (priv->msgs_left == 1) rcar_i2c_flags_set(priv, ID_LAST_MSG); rcar_i2c_write(priv, ICMAR, (priv->msg->addr << 1) | read); - rcar_i2c_write(priv, ICMSR, 0); - rcar_i2c_write(priv, ICMCR, RCAR_BUS_PHASE_START); + /* + * We don't have a testcase but the HW engineers say that the write order + * of ICMSR and ICMCR depends on whether we issue START or REP_START. Since + * it didn't cause a drawback for me, let's rather be safe than sorry. + */ + if (rcar_i2c_flags_has(priv, ID_FIRST_MSG)) { + rcar_i2c_write(priv, ICMSR, 0); + rcar_i2c_write(priv, ICMCR, RCAR_BUS_PHASE_START); + } else { + rcar_i2c_write(priv, ICMCR, RCAR_BUS_PHASE_START); + rcar_i2c_write(priv, ICMSR, 0); + } rcar_i2c_write(priv, ICMIER, read ? RCAR_IRQ_RECV : RCAR_IRQ_SEND); } @@ -268,6 +278,7 @@ static void rcar_i2c_next_msg(struct rcar_i2c_priv *priv) { priv->msg++; priv->msgs_left--; + priv->flags = 0; rcar_i2c_prepare_msg(priv); } @@ -482,10 +493,10 @@ static int rcar_i2c_master_xfer(struct i2c_adapter *adap, } } - /* init data */ + /* init first message */ priv->msg = msgs; priv->msgs_left = num; - + priv->flags = ID_FIRST_MSG; rcar_i2c_prepare_msg(priv); time_left = wait_event_timeout(priv->wait,