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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E526AC43217 for ; Tue, 5 Apr 2022 09:52:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346192AbiDEJoe (ORCPT ); Tue, 5 Apr 2022 05:44:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34688 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239435AbiDEIUF (ORCPT ); Tue, 5 Apr 2022 04:20:05 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0DFEC93981; Tue, 5 Apr 2022 01:13:14 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id C3771B81B92; Tue, 5 Apr 2022 08:13:12 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 38E42C385A0; Tue, 5 Apr 2022 08:13:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1649146391; bh=0UVw1YIHqiI61x9atIvc1XzjmQZco7kHz8d5msPmZN4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=tGt0Fy6Hgs6xusDGzPfPPKVU00/HPRtn+lUWh05uwL+J8hyM9pCG0sxb+9ZTteReP ni0nqmBwcw96SjV/P7IPFJIAGbwsLCoVnw2g5GWyUyDHutN3h91sPSNjkZf9Q7GAEx KxLrFqrzotuSWsIQ9zMJWtrTBQyGa/Gg7qq5blGw= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Taniya Das , Bjorn Andersson , Sasha Levin Subject: [PATCH 5.17 0746/1126] clk: qcom: clk-rcg2: Update logic to calculate D value for RCG Date: Tue, 5 Apr 2022 09:24:53 +0200 Message-Id: <20220405070429.480771077@linuxfoundation.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220405070407.513532867@linuxfoundation.org> References: <20220405070407.513532867@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: Taniya Das [ Upstream commit 58922910add18583d5273c2edcdb9fd7bf4eca02 ] 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 Signed-off-by: Bjorn Andersson Link: https://lore.kernel.org/r/20220227175536.3131-1-tdas@codeaurora.org Signed-off-by: Sasha Levin --- drivers/clk/qcom/clk-rcg2.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/drivers/clk/qcom/clk-rcg2.c b/drivers/clk/qcom/clk-rcg2.c index e1b1b426fae4..b831975a9606 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_t(u32, d_val, 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; } -- 2.34.1