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=-9.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,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 DF362C433E7 for ; Mon, 12 Oct 2020 13:45:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8F8AF22202 for ; Mon, 12 Oct 2020 13:45:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1602510344; bh=i6acXUDg8PGCFSJtg3uzPumV/pszmD9uG/oEDB6moBU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=KbGtYgAQKfCjIPZ5gcuuT/ARRcCilGQJHhdWmaeJ50kNRhOUqLiA50WzRfgsrjtP/ X2HMTcviU5827WRxT5SeoDq1Z6L4j3V9qUnBfhQ8Ob538/9HOgmOsG/YhNQ2MZSpBk SweH+z1MDHp1JJqfRqr/+NiWpJacZVRr/FNE0w5w= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389672AbgJLNpm (ORCPT ); Mon, 12 Oct 2020 09:45:42 -0400 Received: from mail.kernel.org ([198.145.29.99]:46188 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731512AbgJLNmD (ORCPT ); Mon, 12 Oct 2020 09:42:03 -0400 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id B3A7922203; Mon, 12 Oct 2020 13:41:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1602510106; bh=i6acXUDg8PGCFSJtg3uzPumV/pszmD9uG/oEDB6moBU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=FlSjNtkuMmH5MtIcZWmBHUap9hz17fDucPqj8qLUiGD7Jv5WGLziHw5suMjUOIHxr MMFUIbUH366rQwPjzRMBjeseXEuGrxZTFGxebWshyfYL46XKp6JGUgXsHdrcNGHs57 UnX+RM4vHFI4HHqv4rRW8zjB3R5roNo2v7PsTeEc= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Nicolas Belin , Jerome Brunet , Wolfram Sang Subject: [PATCH 5.4 41/85] i2c: meson: fixup rate calculation with filter delay Date: Mon, 12 Oct 2020 15:27:04 +0200 Message-Id: <20201012132634.834324417@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201012132632.846779148@linuxfoundation.org> References: <20201012132632.846779148@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Nicolas Belin commit 1334d3b4e49e35d8912a7c37ffca4c5afb9a0516 upstream. Apparently, 15 cycles of the peripheral clock are used by the controller for sampling and filtering. Because this was not known before, the rate calculation is slightly off. Clean up and fix the calculation taking this filtering delay into account. Fixes: 30021e3707a7 ("i2c: add support for Amlogic Meson I2C controller") Signed-off-by: Nicolas Belin Signed-off-by: Jerome Brunet Signed-off-by: Wolfram Sang Signed-off-by: Greg Kroah-Hartman --- drivers/i2c/busses/i2c-meson.c | 23 ++++++++++++----------- 1 file changed, 12 insertions(+), 11 deletions(-) --- a/drivers/i2c/busses/i2c-meson.c +++ b/drivers/i2c/busses/i2c-meson.c @@ -33,10 +33,8 @@ #define REG_CTRL_ACK_IGNORE BIT(1) #define REG_CTRL_STATUS BIT(2) #define REG_CTRL_ERROR BIT(3) -#define REG_CTRL_CLKDIV_SHIFT 12 -#define REG_CTRL_CLKDIV_MASK GENMASK(21, 12) -#define REG_CTRL_CLKDIVEXT_SHIFT 28 -#define REG_CTRL_CLKDIVEXT_MASK GENMASK(29, 28) +#define REG_CTRL_CLKDIV GENMASK(21, 12) +#define REG_CTRL_CLKDIVEXT GENMASK(29, 28) #define REG_SLV_ADDR GENMASK(7, 0) #define REG_SLV_SDA_FILTER GENMASK(10, 8) @@ -45,6 +43,7 @@ #define REG_SLV_SCL_LOW_EN BIT(28) #define I2C_TIMEOUT_MS 500 +#define FILTER_DELAY 15 enum { TOKEN_END = 0, @@ -139,19 +138,21 @@ static void meson_i2c_set_clk_div(struct unsigned long clk_rate = clk_get_rate(i2c->clk); unsigned int div; - div = DIV_ROUND_UP(clk_rate, freq * i2c->data->div_factor); + div = DIV_ROUND_UP(clk_rate, freq); + div -= FILTER_DELAY; + div = DIV_ROUND_UP(div, i2c->data->div_factor); /* clock divider has 12 bits */ - if (div >= (1 << 12)) { + if (div > GENMASK(11, 0)) { dev_err(i2c->dev, "requested bus frequency too low\n"); - div = (1 << 12) - 1; + div = GENMASK(11, 0); } - meson_i2c_set_mask(i2c, REG_CTRL, REG_CTRL_CLKDIV_MASK, - (div & GENMASK(9, 0)) << REG_CTRL_CLKDIV_SHIFT); + meson_i2c_set_mask(i2c, REG_CTRL, REG_CTRL_CLKDIV, + FIELD_PREP(REG_CTRL_CLKDIV, div & GENMASK(9, 0))); - meson_i2c_set_mask(i2c, REG_CTRL, REG_CTRL_CLKDIVEXT_MASK, - (div >> 10) << REG_CTRL_CLKDIVEXT_SHIFT); + meson_i2c_set_mask(i2c, REG_CTRL, REG_CTRL_CLKDIVEXT, + FIELD_PREP(REG_CTRL_CLKDIVEXT, div >> 10)); /* Disable HIGH/LOW mode */ meson_i2c_set_mask(i2c, REG_SLAVE_ADDR, REG_SLV_SCL_LOW_EN, 0);