From patchwork Sun Apr 25 07:08:22 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Taniya Das X-Patchwork-Id: 12222995 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=-16.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,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 B197EC433ED for ; Sun, 25 Apr 2021 07:09:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9557461404 for ; Sun, 25 Apr 2021 07:09:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229830AbhDYHJo (ORCPT ); Sun, 25 Apr 2021 03:09:44 -0400 Received: from m43-7.mailgun.net ([69.72.43.7]:61582 "EHLO m43-7.mailgun.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229707AbhDYHJn (ORCPT ); Sun, 25 Apr 2021 03:09:43 -0400 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1619334544; h=References: In-Reply-To: Message-Id: Date: Subject: Cc: To: From: Sender; bh=M7/gztcsuqHr7jLZXwVGqGrB8iHlOwvthXDr81P5UP8=; b=Bt6P7Eqxp5TzGfcHvr50PeHZwpqyN/AK91JsLXWEuhTTtwdTp+Wb8HfF1Jtzzsvusdvx3Edz sqOKbNHhGyU74N4qsD96ihkuuRqPkKO28xApX6do6f2Xz3CsauaIK2DBEdt2Uxf7MiFY55E6 xbhwQvxUTz5HKO9EIB0yg3yWQDA= X-Mailgun-Sending-Ip: 69.72.43.7 X-Mailgun-Sid: WyI4MzlhZiIsICJsaW51eC1jbGtAdmdlci5rZXJuZWwub3JnIiwgImJlOWU0YSJd Received: from smtp.codeaurora.org (ec2-35-166-182-171.us-west-2.compute.amazonaws.com [35.166.182.171]) by smtp-out-n07.prod.us-west-2.postgun.com with SMTP id 6085157d2cc44d3aea6e6355 (version=TLS1.2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256); Sun, 25 Apr 2021 07:08:45 GMT Sender: tdas=codeaurora.org@mg.codeaurora.org Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 9BAFFC433F1; Sun, 25 Apr 2021 07:08:45 +0000 (UTC) Received: from tdas-linux.qualcomm.com (unknown [202.46.22.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: tdas) by smtp.codeaurora.org (Postfix) with ESMTPSA id 67954C433D3; Sun, 25 Apr 2021 07:08:41 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 67954C433D3 Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; spf=fail smtp.mailfrom=tdas@codeaurora.org From: Taniya Das To: Stephen Boyd , =?utf-8?q?Michael_Turquette_=C2=A0?= Cc: Rajendra Nayak , linux-arm-msm@vger.kernel.org, linux-soc@vger.kernel.org, linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org, Taniya Das Subject: [PATCH v3] clk: qcom: clk-rcg2: Add support for duty-cycle for RCG Date: Sun, 25 Apr 2021 12:38:22 +0530 Message-Id: <1619334502-9880-2-git-send-email-tdas@codeaurora.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1619334502-9880-1-git-send-email-tdas@codeaurora.org> References: <1619334502-9880-1-git-send-email-tdas@codeaurora.org> Precedence: bulk List-ID: X-Mailing-List: linux-clk@vger.kernel.org The root clock generators with MND divider has the capability to support change in duty-cycle by updating the 'D'. Add the clock ops which would check all the boundary conditions and enable setting the desired duty-cycle as per the consumer. Signed-off-by: Taniya Das --- drivers/clk/qcom/clk-rcg2.c | 81 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 81 insertions(+) -- Qualcomm INDIA, on behalf of Qualcomm Innovation Center, Inc.is a member of the Code Aurora Forum, hosted by the Linux Foundation. diff --git a/drivers/clk/qcom/clk-rcg2.c b/drivers/clk/qcom/clk-rcg2.c index 05ff3b0..aa03e31 100644 --- a/drivers/clk/qcom/clk-rcg2.c +++ b/drivers/clk/qcom/clk-rcg2.c @@ -357,6 +357,83 @@ static int clk_rcg2_set_floor_rate_and_parent(struct clk_hw *hw, return __clk_rcg2_set_rate(hw, rate, FLOOR); } +static int clk_rcg2_get_duty_cycle(struct clk_hw *hw, struct clk_duty *duty) +{ + struct clk_rcg2 *rcg = to_clk_rcg2(hw); + u32 notn_m_val, n_val, m_val, d_val, not2d_val, mask; + + if (!rcg->mnd_width) { + /* 50 % duty-cycle for Non-MND RCGs */ + duty->num = 1; + duty->den = 2; + return 0; + } + + regmap_read(rcg->clkr.regmap, RCG_D_OFFSET(rcg), ¬2d_val); + regmap_read(rcg->clkr.regmap, RCG_M_OFFSET(rcg), &m_val); + regmap_read(rcg->clkr.regmap, RCG_N_OFFSET(rcg), ¬n_m_val); + + if (!not2d_val && !m_val && !notn_m_val) { + /* 50 % duty-cycle always */ + duty->num = 1; + duty->den = 2; + return 0; + } + + mask = BIT(rcg->mnd_width) - 1; + + d_val = ~(not2d_val) & mask; + d_val = DIV_ROUND_CLOSEST(d_val, 2); + + n_val = (~(notn_m_val) + m_val) & mask; + + duty->num = d_val; + duty->den = n_val; + + return 0; +} + +static int clk_rcg2_set_duty_cycle(struct clk_hw *hw, struct clk_duty *duty) +{ + struct clk_rcg2 *rcg = to_clk_rcg2(hw); + u32 notn_m_val, n_val, m_val, d_val, not2d_val, mask, duty_per; + int ret; + + /* Duty-cycle cannot be modified for non-MND RCGs */ + if (!rcg->mnd_width) + return -EINVAL; + + mask = BIT(rcg->mnd_width) - 1; + + regmap_read(rcg->clkr.regmap, RCG_N_OFFSET(rcg), ¬n_m_val); + regmap_read(rcg->clkr.regmap, RCG_M_OFFSET(rcg), &m_val); + + n_val = (~(notn_m_val) + m_val) & mask; + + duty_per = (duty->num * 100) / duty->den; + + /* Calculate 2d value */ + d_val = DIV_ROUND_CLOSEST(n_val * duty_per * 2, 100); + + /* Check bit widths of 2d. If D is too big reduce duty cycle. */ + if (d_val > mask) + d_val = mask; + + if ((d_val / 2) > (n_val - m_val)) + d_val = (n_val - m_val) * 2; + else if ((d_val / 2) < (m_val / 2)) + d_val = m_val; + + not2d_val = ~d_val & mask; + + ret = regmap_update_bits(rcg->clkr.regmap, RCG_D_OFFSET(rcg), mask, + not2d_val); + if (ret) + return ret; + + return update_config(rcg); +} + const struct clk_ops clk_rcg2_ops = { .is_enabled = clk_rcg2_is_enabled, .get_parent = clk_rcg2_get_parent, @@ -365,6 +442,8 @@ const struct clk_ops clk_rcg2_ops = { .determine_rate = clk_rcg2_determine_rate, .set_rate = clk_rcg2_set_rate, .set_rate_and_parent = clk_rcg2_set_rate_and_parent, + .get_duty_cycle = clk_rcg2_get_duty_cycle, + .set_duty_cycle = clk_rcg2_set_duty_cycle, }; EXPORT_SYMBOL_GPL(clk_rcg2_ops); @@ -376,6 +455,8 @@ const struct clk_ops clk_rcg2_floor_ops = { .determine_rate = clk_rcg2_determine_floor_rate, .set_rate = clk_rcg2_set_floor_rate, .set_rate_and_parent = clk_rcg2_set_floor_rate_and_parent, + .get_duty_cycle = clk_rcg2_get_duty_cycle, + .set_duty_cycle = clk_rcg2_set_duty_cycle, }; EXPORT_SYMBOL_GPL(clk_rcg2_floor_ops);