From patchwork Thu Mar 28 07:54:31 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gabor Juhos X-Patchwork-Id: 13608102 Received: from mail-wm1-f49.google.com (mail-wm1-f49.google.com [209.85.128.49]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 528CC537E0; Thu, 28 Mar 2024 07:54:48 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.49 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711612490; cv=none; b=N57xoxsTPP65lmTwxiMtFoptx3YHnPR0/kS/3B4B8FZGMOTBiXPMU6HfPNP7O6Vx7q9fqYHS9Xqul1rqp2ip6uspl8EKuBjz7ckKiMb09U/oLmOVgmrw2vdLSe6KsJBo9JAfU3jQU94ut4DpCfpa3IgmKXytaynh37x2dVuBlAk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711612490; c=relaxed/simple; bh=7TuQoMUJ6APooA15msUPA1QoRn2CnlT4blDuFPO0e+k=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:To:Cc; b=G7RsTgsVGmgTB8g2727+BBqfzUDURwy2lMEyxGd3RTCYxsdQbxsiZ/yMmFBa56W4HWTj7S8cJTctTcubxTpSkBMkinRGcVomBjKBmVQS+8kejE8PjVT0KND4Hwm805vdV/ue8Un2USOxMDw544UlXg00MPe6mQDFmAkiSz+CPdg= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=gtHr+Wsr; arc=none smtp.client-ip=209.85.128.49 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="gtHr+Wsr" Received: by mail-wm1-f49.google.com with SMTP id 5b1f17b1804b1-415482307b0so1023405e9.0; Thu, 28 Mar 2024 00:54:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1711612487; x=1712217287; darn=vger.kernel.org; h=cc:to:message-id:content-transfer-encoding:mime-version:subject :date:from:from:to:cc:subject:date:message-id:reply-to; bh=z/9k825Fqxzz9jmkn3nJFGHIDNvvQD/xvUg6iDj53dY=; b=gtHr+WsrSWA3TwdphK7gmjAqWeh6VER4m13wzcLh6z/zZJ4MbVmT6Eo7TEWHFfp1c5 nU5khv7GGnyu/lYIBg5h3uzfKRgLsdgfVWg6w2YZ8DTzoUxqXG3umew/FCnUdtwdNsSg itValM0uX0VCix9FLXMg5JRbP8LUWBDvjNyjzukI+DwuzBes13K9ZopXZVAsnGzwN3M9 bn+C1ekZFA9vgicGoBiY3wiJgNDn/NJJD6n8S2I0zjHqX/OOD9fZQfPobsXp7lcioboq Aj5dk6x+U+2UNhr50PrQ5ioyFNDyabNe+dWIQz4zMoZhqiQJmxU3NHys84wV5v4Qghig nXZQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1711612487; x=1712217287; h=cc:to:message-id:content-transfer-encoding:mime-version:subject :date:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=z/9k825Fqxzz9jmkn3nJFGHIDNvvQD/xvUg6iDj53dY=; b=j9QSYyTb7c34ojK8UxcsTyiWHT5ziIs5H+A6bGwlPNSNUSedPkaQWKXyI28/IAtIRB BTCqD/ERgZUCBX4aNLVZvm8R3Dyc1sjfhXFtTkSJ/2FLvwN2O8uZ32WZRgwMi+5l0m6y xxxfRSceV8BMPmKQ/Oq4uort363tbH0BG73Tg+ypR+YWvfprqqk2t8HH2+wPwmfXsIDz E2mVnc/i1nqOxqnNSJd25YczLhK4tkBR1TiuZd7R/NPntN4SYEM78pOKVIvg4pus5Qd/ Es8sMGrsAeHpOb6tdXvFQqfytrkXP4gkN64T8MIzOlf/hh2yWJqvc38RDPHxFMBvtoBQ 0exg== X-Forwarded-Encrypted: i=1; AJvYcCX+hrH2sjLeQ39KQkLmD3Bx1GzVS+E8DFsFRzXZugGGc2PMu9LCVTTUmRpH29yWJIDvK6NyUgikHrREMBpCQUMike+1cafBoeDfukjuImDcsXAD7leW6m2UAwN0dfK7Eh1/zZXJX5d2yk4nHJ+ifxq/q75zfP4QzRxqmuQGvvzV X-Gm-Message-State: AOJu0YzUQtEOC8xWkWjq+9EAFyAv5SHEZoZkGr4HfQNdemkyC1wjbYXF JR0oYWmC3GTeUSFvQoIrOhQtTLn6yBpq/pLazc4UOZlFLAFfvSlqswBwG5bMn0k= X-Google-Smtp-Source: AGHT+IHZs9twLePrVnJ1cVOtuujAwLRvaOgRuObZxlafswz4BIhH6CPle3cRX9DVemoO803NyyQIMg== X-Received: by 2002:a05:600c:3505:b0:413:7f3:8d5 with SMTP id h5-20020a05600c350500b0041307f308d5mr2229096wmq.0.1711612486695; Thu, 28 Mar 2024 00:54:46 -0700 (PDT) Received: from [192.168.20.102] (57657817.catv.pool.telekom.hu. [87.101.120.23]) by smtp.googlemail.com with ESMTPSA id v12-20020a05600c470c00b004131310a29fsm1425083wmo.15.2024.03.28.00.54.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 28 Mar 2024 00:54:46 -0700 (PDT) From: Gabor Juhos Date: Thu, 28 Mar 2024 08:54:31 +0100 Subject: [PATCH v3] clk: qcom: clk-alpha-pll: fix rate setting for Stromer PLLs Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240328-alpha-pll-fix-stromer-set-rate-v3-1-1b79714c78bc@gmail.com> X-B4-Tracking: v=1; b=H4sIADYiBWYC/43NQQ6CMBCF4auYrh3TTgtFV97DuCg4QBOgpG0aD eHuFlbsdPlPJt9bWCBvKbDbaWGekg3WTTnk+cSa3kwdgX3lZshRcYkKzDD3BuZhgNa+IUTvRvI QKII3kUBplLqkElXLWUZmT/lvH3g8c/c2ROc/+14S2/VvOgkQIGVR81oUGsX13o3GDpfGjWyjE x658ieHmVOVoUqaVoumOnLrun4BROUC6hsBAAA= To: Bjorn Andersson , Konrad Dybcio , Michael Turquette , Stephen Boyd , Varadarajan Narayanan , Sricharan R , Kathiravan T Cc: linux-arm-msm@vger.kernel.org, linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, Dmitry Baryshkov , Gabor Juhos X-Mailer: b4 0.13.0 The clk_alpha_pll_stromer_set_rate() function writes inproper values into the ALPHA_VAL{,_U} registers which results in wrong clock rates when the alpha value is used. The broken behaviour can be seen on IPQ5018 for example, when dynamic scaling sets the CPU frequency to 800000 KHz. In this case the CPU cores are running only at 792031 KHz: # cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq 800000 # cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq 792031 This happens because the function ignores the fact that the alpha value calculated by the alpha_pll_round_rate() function is only 32 bits wide which must be extended to 40 bits if it is used on a hardware which supports 40 bits wide values. Extend the clk_alpha_pll_stromer_set_rate() function to convert the alpha value to 40 bits before wrinting that into the registers in order to ensure that the hardware really uses the requested rate. After the change the CPU frequency is correct: # cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq 800000 # cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq 800000 Cc: stable@vger.kernel.org Fixes: e47a4f55f240 ("clk: qcom: clk-alpha-pll: Add support for Stromer PLLs") Reviewed-by: Dmitry Baryshkov Signed-off-by: Gabor Juhos --- Changes in v3: - remove constants' comparison (Konrad) - Link to v2: https://lore.kernel.org/r/20240326-alpha-pll-fix-stromer-set-rate-v2-1-48ae83af71c8@gmail.com Changes in v2: - fix subject prefix - rebase on v6.9-rc1 - Link to v1: https://lore.kernel.org/r/20240324-alpha-pll-fix-stromer-set-rate-v1-1-335b0b157219@gmail.com Depends on the following patch: https://lore.kernel.org/r/20240315-apss-ipq-pll-ipq5018-hang-v2-1-6fe30ada2009@gmail.com --- drivers/clk/qcom/clk-alpha-pll.c | 2 ++ 1 file changed, 2 insertions(+) --- base-commit: 4cece764965020c22cff7665b18a012006359095 change-id: 20240324-alpha-pll-fix-stromer-set-rate-472376e624f0 Best regards, diff --git a/drivers/clk/qcom/clk-alpha-pll.c b/drivers/clk/qcom/clk-alpha-pll.c index 8a412ef47e16..8a8abb429577 100644 --- a/drivers/clk/qcom/clk-alpha-pll.c +++ b/drivers/clk/qcom/clk-alpha-pll.c @@ -2490,6 +2490,8 @@ static int clk_alpha_pll_stromer_set_rate(struct clk_hw *hw, unsigned long rate, rate = alpha_pll_round_rate(rate, prate, &l, &a, ALPHA_REG_BITWIDTH); regmap_write(pll->clkr.regmap, PLL_L_VAL(pll), l); + + a <<= ALPHA_REG_BITWIDTH - ALPHA_BITWIDTH; regmap_write(pll->clkr.regmap, PLL_ALPHA_VAL(pll), a); regmap_write(pll->clkr.regmap, PLL_ALPHA_VAL_U(pll), a >> ALPHA_BITWIDTH);