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 X-Spam-Level: X-Spam-Status: No, score=-12.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B6DA5C4363C for ; Wed, 7 Oct 2020 08:08:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5328C2083B for ; Wed, 7 Oct 2020 08:08:18 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=baylibre-com.20150623.gappssmtp.com header.i=@baylibre-com.20150623.gappssmtp.com header.b="j1ZHC/Pl" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727333AbgJGIIR (ORCPT ); Wed, 7 Oct 2020 04:08:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57378 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727154AbgJGIIM (ORCPT ); Wed, 7 Oct 2020 04:08:12 -0400 Received: from mail-ed1-x544.google.com (mail-ed1-x544.google.com [IPv6:2a00:1450:4864:20::544]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B5CD7C0613D4 for ; Wed, 7 Oct 2020 01:08:10 -0700 (PDT) Received: by mail-ed1-x544.google.com with SMTP id x1so1217428eds.1 for ; Wed, 07 Oct 2020 01:08:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=baylibre-com.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=ZhbU6JmaVfKgD1s4cybkcHTBk+tY6By/eFQji3AClKY=; b=j1ZHC/Plvx7SgnRFbucisI2F2GM2pxPOw0vRjiREHyMPuFtNMjkipgmBzOHJa/VcAi FJqJ7PJrOdaLjZnGcPG8L2qFMIp16S/A+06M+a5G+WQtwkIKheWGILG89/UVb7V298tf Nzj4aDM7+puXmcfD2kVkm90kdtH8z3HuE34USZLscGcU5WH+wzCfrnSiy5Z7CO9aTqgU NLca3DEDaNIqyGlboBbdI6tOT31AbHnwtuA1Ub+mYRtY3sLUMub7XvCfmvX0yXHeP4s0 QmE6pVN0y2nDyVSAKQy8sLD6Q6giiQy9lu8IbqlrTRql76vwYnvcfQSJ1McPiTlEJnLX amPw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=ZhbU6JmaVfKgD1s4cybkcHTBk+tY6By/eFQji3AClKY=; b=V1enCK6PN8t0+hvvbl7ZLWbkSlmJOoutOJQ8RYKLZ+qIE2DjDNKPr8D7fcZFdYT/pM +OSL/BHyFdRTLv9G7DHTcsGVn10iDynZmA6p3eWBlwHbX0q2PpgHNgXXogXBwJ0yssD1 zVSPcmuKpiVhrNzlYVM410NufklDHrhS3eThcNk9WsyevpOIE+7GksnI9os97MZWuZG7 RLTnEmgZfBtW9M+3Sjk6+AU58OFQQVLLR/Kem6b444a4IPm8AecXelRBas7W0bGITGv1 /e1ZzaGaR2o26SO9SlNyxPwg6Twwt8McpMNt4XxvghmV2zhveWKBW8pajA4q7tXmwONS ehfQ== X-Gm-Message-State: AOAM5338E+if2bkZlR/Xt79cF9gHvnoOhJzv7/up37YfmDtrDMRqrDsb TMG73jKw1a6aBu1B5nTtD82KNw== X-Google-Smtp-Source: ABdhPJx0XWEkI4HBlS99pxTK0t4QJZzkpystYXF06tW6acHL9Sam6bWwntQ8rUxJW+MCVvIhEPpYlA== X-Received: by 2002:a50:c309:: with SMTP id a9mr2285070edb.199.1602058089334; Wed, 07 Oct 2020 01:08:09 -0700 (PDT) Received: from starbuck.lan (cag06-3-82-243-161-21.fbx.proxad.net. [82.243.161.21]) by smtp.googlemail.com with ESMTPSA id p11sm888645edu.93.2020.10.07.01.08.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 07 Oct 2020 01:08:08 -0700 (PDT) From: Jerome Brunet To: Wolfram Sang , Kevin Hilman Cc: Jerome Brunet , Nicolas Belin , linux-i2c@vger.kernel.org, linux-amlogic@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH 1/3] i2c: meson: fix clock setting overwrite Date: Wed, 7 Oct 2020 10:07:49 +0200 Message-Id: <20201007080751.1259442-2-jbrunet@baylibre.com> X-Mailer: git-send-email 2.25.4 In-Reply-To: <20201007080751.1259442-1-jbrunet@baylibre.com> References: <20201007080751.1259442-1-jbrunet@baylibre.com> MIME-Version: 1.0 X-Patchwork-Bot: notify Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org When the slave address is written in do_start(), SLAVE_ADDR is written completely. This may overwrite some setting related to the clock rate or signal filtering. Fix this by writing only the bits related to slave address. To avoid causing unexpected changed, explicitly disable filtering or high/low clock mode which may have been left over by the bootloader. Fixes: 30021e3707a7 ("i2c: add support for Amlogic Meson I2C controller") Signed-off-by: Jerome Brunet --- drivers/i2c/busses/i2c-meson.c | 19 ++++++++++++++++++- 1 file changed, 18 insertions(+), 1 deletion(-) diff --git a/drivers/i2c/busses/i2c-meson.c b/drivers/i2c/busses/i2c-meson.c index c5dec572fc48..dac0d2a00cec 100644 --- a/drivers/i2c/busses/i2c-meson.c +++ b/drivers/i2c/busses/i2c-meson.c @@ -5,6 +5,7 @@ * Copyright (C) 2014 Beniamino Galvani */ +#include #include #include #include @@ -38,6 +39,12 @@ #define REG_CTRL_CLKDIVEXT_SHIFT 28 #define REG_CTRL_CLKDIVEXT_MASK GENMASK(29, 28) +#define REG_SLV_ADDR GENMASK(7, 0) +#define REG_SLV_SDA_FILTER GENMASK(10, 8) +#define REG_SLV_SCL_FILTER GENMASK(13, 11) +#define REG_SLV_SCL_LOW GENMASK(27, 16) +#define REG_SLV_SCL_LOW_EN BIT(28) + #define I2C_TIMEOUT_MS 500 enum { @@ -147,6 +154,9 @@ static void meson_i2c_set_clk_div(struct meson_i2c *i2c, unsigned int freq) meson_i2c_set_mask(i2c, REG_CTRL, REG_CTRL_CLKDIVEXT_MASK, (div >> 10) << REG_CTRL_CLKDIVEXT_SHIFT); + /* Disable HIGH/LOW mode */ + meson_i2c_set_mask(i2c, REG_SLAVE_ADDR, REG_SLV_SCL_LOW_EN, 0); + dev_dbg(i2c->dev, "%s: clk %lu, freq %u, div %u\n", __func__, clk_rate, freq, div); } @@ -280,7 +290,10 @@ static void meson_i2c_do_start(struct meson_i2c *i2c, struct i2c_msg *msg) token = (msg->flags & I2C_M_RD) ? TOKEN_SLAVE_ADDR_READ : TOKEN_SLAVE_ADDR_WRITE; - writel(msg->addr << 1, i2c->regs + REG_SLAVE_ADDR); + + meson_i2c_set_mask(i2c, REG_SLAVE_ADDR, REG_SLV_ADDR, + FIELD_PREP(REG_SLV_ADDR, msg->addr << 1)); + meson_i2c_add_token(i2c, TOKEN_START); meson_i2c_add_token(i2c, token); } @@ -461,6 +474,10 @@ static int meson_i2c_probe(struct platform_device *pdev) return ret; } + /* Disable filtering */ + meson_i2c_set_mask(i2c, REG_SLAVE_ADDR, + REG_SLV_SDA_FILTER | REG_SLV_SCL_FILTER, 0); + meson_i2c_set_clk_div(i2c, timings.bus_freq_hz); return 0; -- 2.25.4