From patchwork Mon Feb 21 18:13:21 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Taniya Das X-Patchwork-Id: 12754045 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id F0C59C4332F for ; Mon, 21 Feb 2022 18:26:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230357AbiBUS1H (ORCPT ); Mon, 21 Feb 2022 13:27:07 -0500 Received: from mxb-00190b01.gslb.pphosted.com ([23.128.96.19]:44944 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232227AbiBUSYZ (ORCPT ); Mon, 21 Feb 2022 13:24:25 -0500 Received: from m43-7.mailgun.net (m43-7.mailgun.net [69.72.43.7]) by lindbergh.monkeyblade.net (Postfix) with UTF8SMTPS id C45F3E11 for ; Mon, 21 Feb 2022 10:15:10 -0800 (PST) DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1645467310; h=Message-Id: Date: Subject: Cc: To: From: Sender; bh=WhphKfRy9g4NeVDixtg98cLVHh4lJkO88d2PT8ssf/A=; b=rn0lF1xzsYJ94CPz1cLDMluogSMLSn04qk5KfbAv4JUHYgg2Zvtgs4jpIXmQRNt2tADTn0y3 SwkZCQ/Vv9Wv7F4rwBiCvGmszhoAC51d3oRFh8E1/sq11sowTQsCwGdVqzFC3Zdm/RJGbev7 VZds+TCyXpdTKq76WJ7b3/r+Uew= 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-n02.prod.us-west-2.postgun.com with SMTP id 6213d64db360e81798bd660a (version=TLS1.2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256); Mon, 21 Feb 2022 18:13:33 GMT Sender: tdas=codeaurora.org@mg.codeaurora.org Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 7EDF3C43618; Mon, 21 Feb 2022 18:13:33 +0000 (UTC) Received: from hu-tdas-hyd.qualcomm.com (unknown [202.46.22.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: tdas) by smtp.codeaurora.org (Postfix) with ESMTPSA id 27229C4360C; Mon, 21 Feb 2022 18:13:29 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 smtp.codeaurora.org 27229C4360C 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=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 v2 1/2] clk: qcom: clk-rcg2: Update logic to calculate D value for RCG Date: Mon, 21 Feb 2022 23:43:21 +0530 Message-Id: <20220221181322.5486-1-tdas@codeaurora.org> X-Mailer: git-send-email 2.17.1 Precedence: bulk List-ID: X-Mailing-List: linux-clk@vger.kernel.org The display pixel clock has a requirement on certain newer platforms to support M/N as (2/3) and the final D value calculated results in underflow errors. As the current implementation does not check for D value is within the accepted range for a given M & N value. Update the logic to calculate the final D value based on the range. Fixes: 99cbd064b059f ("clk: qcom: Support display RCG clocks") Signed-off-by: Taniya Das --- [v2] * Update the if else check with clamp. * Typecast the f->m to u32. drivers/clk/qcom/clk-rcg2.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) -- 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 e1b1b426fae4..3a78a2a16cf8 100644 --- a/drivers/clk/qcom/clk-rcg2.c +++ b/drivers/clk/qcom/clk-rcg2.c @@ -264,7 +264,7 @@ static int clk_rcg2_determine_floor_rate(struct clk_hw *hw, static int __clk_rcg2_configure(struct clk_rcg2 *rcg, const struct freq_tbl *f) { - u32 cfg, mask; + u32 cfg, mask, d_val, not2d_val, n_minus_m; struct clk_hw *hw = &rcg->clkr.hw; int ret, index = qcom_find_src_index(hw, rcg->parent_map, f->src); @@ -283,8 +283,17 @@ static int __clk_rcg2_configure(struct clk_rcg2 *rcg, const struct freq_tbl *f) if (ret) return ret; + /* Calculate 2d value */ + d_val = f->n; + + n_minus_m = f->n - f->m; + n_minus_m *= 2; + + d_val = clamp(d_val, (u32)f->m, n_minus_m); + not2d_val = ~d_val & mask; + ret = regmap_update_bits(rcg->clkr.regmap, - RCG_D_OFFSET(rcg), mask, ~f->n); + RCG_D_OFFSET(rcg), mask, not2d_val); if (ret) return ret; }