From patchwork Sun Aug 14 21:29:31 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Heiner Kallweit X-Patchwork-Id: 12942963 X-Patchwork-Delegate: neil.armstrong@linaro.org 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 (bombadil.infradead.org [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 C1CFEC25B06 for ; Sun, 14 Aug 2022 21:29:56 +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:Cc:To:Subject:From:MIME-Version:Date: Message-ID:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=nOKQ6myN4ndjOynAd6WeQorwsVhVpvT+nQqd+3jQwL0=; b=puqYWPju5xSeWv mzWrQMt1mGY3QfzXW00o7mGGlQRNhTQ3zfeLbPdva7Wj5vgM2XUfAZIpEXjHwZvWoVorVCTbdJ6Od ooxFbQOzFG++tL2EL6NArEBe5VB9QJeFhRbIPz1K2ovHP1UlBm5rB8Pn5qC1fFJw+ly0Ph2WUdHUP 736FUn5odCJ38vqMNkBYzaLEh8+RxDgo6R1+bFumiKHyh7RE83H15oHmYnfxNVKyOR8oYdXmMqu69 +oMEXWyazcfrpN9VcZ8tU0kTnxlNCB7O4u6MYlP//dfT00RP1XZM9TmKcjXRFfLhGKv5qOtDi9KzK xLd2Y+TvMYIWqiNAkwPA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1oNLB3-009GNk-Sd; Sun, 14 Aug 2022 21:29:45 +0000 Received: from mail-ed1-x52a.google.com ([2a00:1450:4864:20::52a]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1oNLB1-009GM0-3J; Sun, 14 Aug 2022 21:29:44 +0000 Received: by mail-ed1-x52a.google.com with SMTP id f22so7487451edc.7; Sun, 14 Aug 2022 14:29:40 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=content-transfer-encoding:content-language:cc:to:subject:from :user-agent:mime-version:date:message-id:from:to:cc; bh=AqecQy6KL+dyrHbPbN0H6O069pqDD1q//SRpEmJs3Tk=; b=ZV4rvAz8j4OiykMmfmEqslHAfRQi0/ErQS12ZPDLOugqNBJOO1Yl1VAOJVeIsa27LX JZdPavEDOpXeBMxQ8aoOnRyrlgBPCh7qNWNBWtjJwfUgpk+WSZQDi1P0eo7AYTX4D3/t V5i3Q1EV7JV9qE7Cr8wmUQlInqkmdFcSDaOvchlguj0E04zGkS76kpOz2peyPyFTSkFi FciIn+XmJIRWhGwow82ujQ/Zbk1q2V0PgYBPB5m8qHfQXVf1/YTWjgHvy+DAwT3s1F5P CsLRHQqSoojtlUYd1mP20OBf3B66ZduZLSHEfO4VYo1XG52/kLPRvewKRjA0BavDQ11m BDCA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:content-language:cc:to:subject:from :user-agent:mime-version:date:message-id:x-gm-message-state:from:to :cc; bh=AqecQy6KL+dyrHbPbN0H6O069pqDD1q//SRpEmJs3Tk=; b=y35gHJZCD49QqxLe0Mz7AIPjWY9s98YLSuJHkUyr4gAP1m7ohg02r/h2jeLTMSHBHq vn5QMlzPxcrNe9yImJ79rbGCz+4Kau+FeotzIX4eCPwIkRqLDnLhlUu/7k73fHxqZ6uC hu1yyGWrsbrcWjdhLt6Js8R4M62tDhRKJ7+1lKPTTahXjBxo+8OMapsXZxpD6PEU94eC 8dUFnRsOBe4A5rB1vcZNLEuqFNrWQ6k8lEzu5RN6FejFkliE73EgU43JPoqVZOGoOW2z GRz20E32q6jzMVgF0+mlm6crEsV5IC4RoUsORprPMShjb8pKXmErjyu5MaQBb1b0vXfK qV4Q== X-Gm-Message-State: ACgBeo0ryrqYxZGX7jB7f2jSHMsc2T8xS36JJPGgp6N3/HwNKWrbBCxU uKpr8AWRyfHYV8ylJ4yV390= X-Google-Smtp-Source: AA6agR4yRNP/AbhzJeM/gy+WgKeyWQZBV/HqoJ3i5RlhlPeywYgPQj8AjdauI0fnoGinAD4Vf/Dltg== X-Received: by 2002:a05:6402:42cb:b0:43d:bf29:cf89 with SMTP id i11-20020a05640242cb00b0043dbf29cf89mr11640068edc.400.1660512579811; Sun, 14 Aug 2022 14:29:39 -0700 (PDT) Received: from ?IPV6:2a01:c23:c1a2:1a00:2049:10ba:dbb:6620? (dynamic-2a01-0c23-c1a2-1a00-2049-10ba-0dbb-6620.c23.pool.telefonica.de. [2a01:c23:c1a2:1a00:2049:10ba:dbb:6620]) by smtp.googlemail.com with ESMTPSA id gv11-20020a170906f10b00b0072af4af2f46sm3325740ejb.74.2022.08.14.14.29.39 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 14 Aug 2022 14:29:39 -0700 (PDT) Message-ID: <22f1d799-a3bb-3d71-a3fd-f6128b205231@gmail.com> Date: Sun, 14 Aug 2022 23:29:31 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.12.0 From: Heiner Kallweit Subject: [PATCH] clk: meson: pll: adjust timeout in meson_clk_pll_wait_lock() To: Neil Armstrong , Jerome Brunet , Michael Turquette , Stephen Boyd , Kevin Hilman , Martin Blumenstingl Cc: "open list:ARM/Amlogic Meson..." , linux-clk@vger.kernel.org, "linux-arm-kernel@lists.infradead.org" Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220814_142943_272094_0C4B8336 X-CRM114-Status: GOOD ( 10.37 ) 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 Currently we loop over meson_parm_read() up to 24mln times. This results in a unpredictable timeout period. In my case it's over 5s on a S905X4-based system. Make the timeout period predictable and set it to 100ms. Whilst we're at it: All callers of this function return -EIO in case of failure, therefore we can return this value directly in the timeout case. Signed-off-by: Heiner Kallweit --- drivers/clk/meson/clk-pll.c | 15 ++++++--------- 1 file changed, 6 insertions(+), 9 deletions(-) diff --git a/drivers/clk/meson/clk-pll.c b/drivers/clk/meson/clk-pll.c index daa025b6d..d70bee331 100644 --- a/drivers/clk/meson/clk-pll.c +++ b/drivers/clk/meson/clk-pll.c @@ -277,17 +277,17 @@ static int meson_clk_pll_wait_lock(struct clk_hw *hw) { struct clk_regmap *clk = to_clk_regmap(hw); struct meson_clk_pll_data *pll = meson_clk_pll_data(clk); - int delay = 24000000; + int delay = 5000; do { - /* Is the clock locked now ? */ + /* Is the clock locked now ? Time out after 100ms. */ if (meson_parm_read(clk->map, &pll->l)) return 0; - delay--; - } while (delay > 0); + udelay(20); + } while (--delay); - return -ETIMEDOUT; + return -EIO; } static int meson_clk_pll_init(struct clk_hw *hw) @@ -350,10 +350,7 @@ static int meson_clk_pll_enable(struct clk_hw *hw) /* Take the pll out reset */ meson_parm_write(clk->map, &pll->rst, 0); - if (meson_clk_pll_wait_lock(hw)) - return -EIO; - - return 0; + return meson_clk_pll_wait_lock(hw); } static void meson_clk_pll_disable(struct clk_hw *hw)