From patchwork Mon Jan 6 01:04:20 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Osipenko X-Patchwork-Id: 1217873 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (no SPF record) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=linux-i2c-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.b="cBDSl6BX"; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 47rckN0WRNz9sSP for ; Mon, 6 Jan 2020 12:05:16 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727315AbgAFBFL (ORCPT ); Sun, 5 Jan 2020 20:05:11 -0500 Received: from mail-lj1-f195.google.com ([209.85.208.195]:44661 "EHLO mail-lj1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727234AbgAFBEn (ORCPT ); Sun, 5 Jan 2020 20:04:43 -0500 Received: by mail-lj1-f195.google.com with SMTP id u71so49244877lje.11; Sun, 05 Jan 2020 17:04:41 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=+y0KhirYz7Qpd7TQAaHTz11cWV+TrICbXO1Zs7mmjzE=; b=cBDSl6BX+bG78fS9ceAiGmLYmA/BUZXPHrB8v9zYYmDm0c3HwbQbcp1FIG0ZTODn1t T5efgSl9OdnDNusCM38UpYfmYqAcvUS9T92NE+wJfOB46RpQ+nMoQSXKdzU8DBjDz8Ps BPiQbBWW4syyNwL5/7Pcnhbpf9rX2wokFtzvw2RDuf2EgpZibInexNL0jI/woGfZYZro KW9+CR4jlbgAgvDrvxUHcjvTU8eZSDO9ejM2luzbl6p3ySUadBzzWgICyhmWwlojLiyx WLEkD6t24noPSU5b4odeOWpao2h4e6B4po7SH9U+Db9M86FVJ5t5GDuGdkxT2sGcQJaI cJyw== 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=+y0KhirYz7Qpd7TQAaHTz11cWV+TrICbXO1Zs7mmjzE=; b=rMGMxGUVRt+Fhebxf16TNztMmBdZ40gb83wm04vXlqb8ERRlVVgfB2Tjql6Trw3Z8P IO1d8tBUMMpxjsLMLxd82JKorENqkGQqohX2uS0BmJtnu6hR+nCSvyyZGFGl4vwpVJmB VO44B0FBoU7FwgwNxWfwbWWDyvfkUzJ5QYJAwZ4GtoqNa8bn5ZztNSAuhzH7JsACkF8R cvysKAVZRSndvXheWZ+AMX6lQ7RBk7LmDSkOLBBoH2HYJaf2WgkokRQ816dbOLby7pJe bwM2r1RYGmG7JrM9QXRt9No5M4kYCogrj6oaDgle5XENbqkBNcWUAuLEpz2jvZYSWZUs DvbA== X-Gm-Message-State: APjAAAWQtPknhWAKVftAyEM9XDOKxj9OU28e2oROxnnFwyvR5DzwozJ3 m/SAjxABYobi16s0Kh0KePk= X-Google-Smtp-Source: APXvYqxiC8fsFkLbJrAn9UCtvMXmxfBU65X85JVQaGESdaY26CXTwpcEH/T4VjhqozbrIdp7A6s9ww== X-Received: by 2002:a2e:9cd8:: with SMTP id g24mr58126603ljj.243.1578272681222; Sun, 05 Jan 2020 17:04:41 -0800 (PST) Received: from localhost.localdomain (79-139-233-37.dynamic.spd-mgts.ru. [79.139.233.37]) by smtp.gmail.com with ESMTPSA id a19sm28245910ljb.103.2020.01.05.17.04.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 05 Jan 2020 17:04:40 -0800 (PST) From: Dmitry Osipenko To: Thierry Reding , Jonathan Hunter , Laxman Dewangan , Mikko Perttunen , Wolfram Sang Cc: linux-i2c@vger.kernel.org, linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v3 6/9] i2c: tegra: Use relaxed versions of readl/writel Date: Mon, 6 Jan 2020 04:04:20 +0300 Message-Id: <20200106010423.5890-7-digetx@gmail.com> X-Mailer: git-send-email 2.24.0 In-Reply-To: <20200106010423.5890-1-digetx@gmail.com> References: <20200106010423.5890-1-digetx@gmail.com> MIME-Version: 1.0 Sender: linux-i2c-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org There is nothing to synchronize in regards to memory accesses for PIO transfers and for DMA transfers the DMA API takes care of the syncing. Signed-off-by: Dmitry Osipenko Tested-by: Thierry Reding --- drivers/i2c/busses/i2c-tegra.c | 21 +++++++++++---------- 1 file changed, 11 insertions(+), 10 deletions(-) diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c index e0eb8f5dcd6b..1a390e1bff72 100644 --- a/drivers/i2c/busses/i2c-tegra.c +++ b/drivers/i2c/busses/i2c-tegra.c @@ -284,12 +284,12 @@ struct tegra_i2c_dev { static void dvc_writel(struct tegra_i2c_dev *i2c_dev, u32 val, unsigned long reg) { - writel(val, i2c_dev->base + reg); + writel_relaxed(val, i2c_dev->base + reg); } static u32 dvc_readl(struct tegra_i2c_dev *i2c_dev, unsigned long reg) { - return readl(i2c_dev->base + reg); + return readl_relaxed(i2c_dev->base + reg); } /* @@ -307,16 +307,16 @@ static unsigned long tegra_i2c_reg_addr(struct tegra_i2c_dev *i2c_dev, static void i2c_writel(struct tegra_i2c_dev *i2c_dev, u32 val, unsigned long reg) { - writel(val, i2c_dev->base + tegra_i2c_reg_addr(i2c_dev, reg)); + writel_relaxed(val, i2c_dev->base + tegra_i2c_reg_addr(i2c_dev, reg)); /* Read back register to make sure that register writes completed */ if (reg != I2C_TX_FIFO) - readl(i2c_dev->base + tegra_i2c_reg_addr(i2c_dev, reg)); + readl_relaxed(i2c_dev->base + tegra_i2c_reg_addr(i2c_dev, reg)); } static u32 i2c_readl(struct tegra_i2c_dev *i2c_dev, unsigned long reg) { - return readl(i2c_dev->base + tegra_i2c_reg_addr(i2c_dev, reg)); + return readl_relaxed(i2c_dev->base + tegra_i2c_reg_addr(i2c_dev, reg)); } static void i2c_writesl(struct tegra_i2c_dev *i2c_dev, void *data, @@ -689,12 +689,13 @@ static int tegra_i2c_wait_for_config_load(struct tegra_i2c_dev *i2c_dev) i2c_writel(i2c_dev, I2C_MSTR_CONFIG_LOAD, I2C_CONFIG_LOAD); if (i2c_dev->is_curr_atomic_xfer) - err = readl_poll_timeout_atomic(addr, val, val == 0, - 1000, - I2C_CONFIG_LOAD_TIMEOUT); + err = readl_relaxed_poll_timeout_atomic( + addr, val, val == 0, 1000, + I2C_CONFIG_LOAD_TIMEOUT); else - err = readl_poll_timeout(addr, val, val == 0, 1000, - I2C_CONFIG_LOAD_TIMEOUT); + err = readl_relaxed_poll_timeout( + addr, val, val == 0, 1000, + I2C_CONFIG_LOAD_TIMEOUT); if (err) { dev_warn(i2c_dev->dev,