From patchwork Sat Apr 9 16:43:34 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lucas Tanure X-Patchwork-Id: 12807975 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (unknown [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 0CBC5C433EF for ; Sat, 9 Apr 2022 16:44:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=A6gkWm4iDZkc5Gkk1fb0Cc10jVjMNzrOVy/TAcdy2iw=; b=Qmy2rv0L7mkxX1 +Gd+MoxxlZtEMNkh7zhzk3furhq5qBO4G7bs0XyQRNI6i56wOmQ1xDynlfcE4jMYYnF3prcKF1Xn+ ry5xwfZ+BW45HN7qmpJcUCnsIGiCK0auI3xXPxYHNK0ZKwGohGHSsQ57iXrDrVzmWvy3Cl553Lefc rYyblUlZKE9ZwZGuH6+Zk5B6uAcVSQ8NouIoy8nMiFqVc+YtP8HYEgvpdBXaHmgNY6ADYazhXi1zT E2kCI3GhhjPFIPq7vkKx84+dTEKVelWYrz2UALLYLz0GhKrXdfyl+aANZni/fZg9QJgKrVJgXLSRw T/ERrJ03J1aWL4/SLYLQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1ndEC2-003Vcw-1Y; Sat, 09 Apr 2022 16:44:10 +0000 Received: from mail-ej1-f48.google.com ([209.85.218.48]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1ndEBZ-003VU6-Ew; Sat, 09 Apr 2022 16:43:43 +0000 Received: by mail-ej1-f48.google.com with SMTP id l7so17514693ejn.2; Sat, 09 Apr 2022 09:43:39 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=tAZvsU5nlu0FKdd+G9qXCM7NYkg4H55ZT6LFNEgv3RI=; b=ZF7HujwkJDxopJ/tyIvmS6Vx+0k3ggKtUN8NNap0l5oHy6awCuUXAKJ9A4t7wLpODr dQDb8nriK7z57EvsqcIPIYOyi3wuLRK8ZhZOrrM6Mh3s9PWp0L3T0YUM1RF0vZM6BX+q R3PddSlMHRD49tNjv6P+/xgiPEy4OSEHh1jJs9NnTL4Uk1s479OPbGE3kNFu4R7+N1Z2 c4ElJT2tYoi5NqYPBxE5gb0AcDZddWoBBAXN4qE8ri76pWg/yjaUxMhkUghJJJIACMkb ns3CDQbihikjhyEmHppcX0jWnzQVH9mLIHmT0nFsbigUKhCxPJ1I01tdrurb7ox4iX+X 8Mnw== X-Gm-Message-State: AOAM531f+HdvQDptYaKkh0OekuY9ToagxDFDe0nffDzRi/lKXccGEgPJ imbi80i9xQkSo4RUNEQ9CCo= X-Google-Smtp-Source: ABdhPJwKRHXA6qAgKaGLSsVhLM5Gp+zrWPdyoW27bFbY+D9wpStbVWJl5x0brNlf44SvE6zwahQuNw== X-Received: by 2002:a17:907:86a3:b0:6da:870c:af44 with SMTP id qa35-20020a17090786a300b006da870caf44mr22664327ejc.445.1649522618211; Sat, 09 Apr 2022 09:43:38 -0700 (PDT) Received: from aryzen.lan (cpc87451-finc19-2-0-cust61.4-2.cable.virginm.net. [82.11.51.62]) by smtp.googlemail.com with ESMTPSA id hu8-20020a170907a08800b006dfd2056ab2sm9893735ejc.97.2022.04.09.09.43.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 09 Apr 2022 09:43:37 -0700 (PDT) From: Lucas Tanure To: Neil Armstrong , Kevin Hilman , Jerome Brunet , Martin Blumenstingl Cc: linux-i2c@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-amlogic@lists.infradead.org, linux-kernel@vger.kernel.org, Lucas Tanure Subject: [PATCH v2 2/2] i2c: meson: Use 50% duty cycle for I2C clock Date: Sat, 9 Apr 2022 17:43:34 +0100 Message-Id: <20220409164334.157664-3-tanure@linux.com> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220409164334.157664-1-tanure@linux.com> References: <20220409164334.157664-1-tanure@linux.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220409_094341_535604_63C69905 X-CRM114-Status: GOOD ( 17.49 ) X-BeenThere: linux-amlogic@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-amlogic" Errors-To: linux-amlogic-bounces+linux-amlogic=archiver.kernel.org@lists.infradead.org The duty cycle of 33% is less than the required by the I2C specs for the LOW period of the SCL clock. Move the duty cyle to 50% for 100Khz or lower clocks, and (40% High SCL / 60% Low SCL) duty cycle for clocks above 100Khz. Signed-off-by: Lucas Tanure Reviewed-by: Neil Armstrong --- drivers/i2c/busses/i2c-meson.c | 70 +++++++++++++++++++++++++++++----- 1 file changed, 60 insertions(+), 10 deletions(-) diff --git a/drivers/i2c/busses/i2c-meson.c b/drivers/i2c/busses/i2c-meson.c index 4b4a5b2d77ab..50dab123380a 100644 --- a/drivers/i2c/busses/i2c-meson.c +++ b/drivers/i2c/busses/i2c-meson.c @@ -65,10 +65,6 @@ enum { STATE_WRITE, }; -struct meson_i2c_data { - unsigned char div_factor; -}; - /** * struct meson_i2c - Meson I2C device private data * @@ -109,6 +105,10 @@ struct meson_i2c { const struct meson_i2c_data *data; }; +struct meson_i2c_data { + void (*set_clk_div)(struct meson_i2c *i2c, unsigned int freq); +}; + static void meson_i2c_set_mask(struct meson_i2c *i2c, int reg, u32 mask, u32 val) { @@ -137,14 +137,62 @@ static void meson_i2c_add_token(struct meson_i2c *i2c, int token) i2c->num_tokens++; } -static void meson_i2c_set_clk_div(struct meson_i2c *i2c, unsigned int freq) +static void meson_gxbb_axg_i2c_set_clk_div(struct meson_i2c *i2c, unsigned int freq) +{ + unsigned long clk_rate = clk_get_rate(i2c->clk); + unsigned int div_h, div_l; + + /* According to I2C-BUS Spec 2.1, in FAST-MODE, the minimum LOW period is 1.3uS, and + * minimum HIGH is least 0.6us. + * For 400000 freq, the period is 2.5us. To keep within the specs, give 40% of period to + * HIGH and 60% to LOW. This means HIGH at 1.0us and LOW 1.5us. + * The same applies for Fast-mode plus, where LOW is 0.5us and HIGH is 0.26us. + * Duty = H/(H + L) = 2/5 + */ + if (freq <= I2C_MAX_STANDARD_MODE_FREQ) { + div_h = DIV_ROUND_UP(clk_rate, freq); + div_l = DIV_ROUND_UP(div_h, 4); + div_h = DIV_ROUND_UP(div_h, 2) - FILTER_DELAY; + } else { + div_h = DIV_ROUND_UP(clk_rate * 2, freq * 5) - FILTER_DELAY; + div_l = DIV_ROUND_UP(clk_rate * 3, freq * 5 * 2); + } + + /* clock divider has 12 bits */ + if (div_h > GENMASK(11, 0)) { + dev_err(i2c->dev, "requested bus frequency too low\n"); + div_h = GENMASK(11, 0); + } + if (div_l > GENMASK(11, 0)) { + dev_err(i2c->dev, "requested bus frequency too low\n"); + div_l = GENMASK(11, 0); + } + + meson_i2c_set_mask(i2c, REG_CTRL, REG_CTRL_CLKDIV_MASK, + FIELD_PREP(REG_CTRL_CLKDIV_MASK, div_h & GENMASK(9, 0))); + + meson_i2c_set_mask(i2c, REG_CTRL, REG_CTRL_CLKDIVEXT_MASK, + FIELD_PREP(REG_CTRL_CLKDIVEXT_MASK, div_h >> 10)); + + /* set SCL low delay */ + meson_i2c_set_mask(i2c, REG_SLAVE_ADDR, REG_SLV_SCL_LOW_MASK, + FIELD_PREP(REG_SLV_SCL_LOW_MASK, div_l)); + + /* Enable HIGH/LOW mode */ + meson_i2c_set_mask(i2c, REG_SLAVE_ADDR, REG_SLV_SCL_LOW_EN, REG_SLV_SCL_LOW_EN); + + dev_dbg(i2c->dev, "%s: clk %lu, freq %u, divh %u, divl %u\n", __func__, + clk_rate, freq, div_h, div_l); +} + +static void meson6_i2c_set_clk_div(struct meson_i2c *i2c, unsigned int freq) { unsigned long clk_rate = clk_get_rate(i2c->clk); unsigned int div; div = DIV_ROUND_UP(clk_rate, freq); div -= FILTER_DELAY; - div = DIV_ROUND_UP(div, i2c->data->div_factor); + div = DIV_ROUND_UP(div, 4); /* clock divider has 12 bits */ if (div > GENMASK(11, 0)) { @@ -472,7 +520,9 @@ static int meson_i2c_probe(struct platform_device *pdev) meson_i2c_set_mask(i2c, REG_SLAVE_ADDR, REG_SLV_SDA_FILTER_MASK | REG_SLV_SCL_FILTER_MASK, 0); - meson_i2c_set_clk_div(i2c, timings.bus_freq_hz); + if (!i2c->data->set_clk_div) + return -EINVAL; + i2c->data->set_clk_div(i2c, timings.bus_freq_hz); ret = i2c_add_adapter(&i2c->adap); if (ret < 0) { @@ -494,15 +544,15 @@ static int meson_i2c_remove(struct platform_device *pdev) } static const struct meson_i2c_data i2c_meson6_data = { - .div_factor = 4, + .set_clk_div = meson6_i2c_set_clk_div, }; static const struct meson_i2c_data i2c_gxbb_data = { - .div_factor = 4, + .set_clk_div = meson_gxbb_axg_i2c_set_clk_div, }; static const struct meson_i2c_data i2c_axg_data = { - .div_factor = 3, + .set_clk_div = meson_gxbb_axg_i2c_set_clk_div, }; static const struct of_device_id meson_i2c_match[] = {