From patchwork Thu Sep 12 07:22:29 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jie Zhan X-Patchwork-Id: 828068 Received: from szxga04-in.huawei.com (szxga04-in.huawei.com [45.249.212.190]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AB8141885A0; Thu, 12 Sep 2024 07:28:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.190 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726126108; cv=none; b=EYsx/rN2GvPXe7oBSDPr2qZ3n+7ezcB3mBfPX1ZjsvHB9t0HlrgOcT5bf4Bid4Hyr/ZfS8YCqsBlC5rqROUgfJMSnaYDpNGZJS6mpxzOXmUIzTZ5X/nWAmxzSuDQOE2D0ho0KDarm58HmGhygF7rnJ8QcdmAjBnYfC5QIndwzr4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726126108; c=relaxed/simple; bh=/H2YIJw5ievGhAEmnlbP90Lt0MUxvAMLUfrQg9NxiD4=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=Xhr4OAo7nbpLBgnIc6LjKeYBDBnYoCrxERiYWAyCLmpSUs1IUOSaMKKNjL4i4QaBbcyYqt58lLv7K8b/Wapu3fu+a77CQoGVEJhGtmwN4CLIsf1DnkuX3xkmHHB+Yo4B1pOu6kMVimckNJ5yLaifNyYsqz0Ra3JdlAyNAfU5zUg= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=hisilicon.com; spf=pass smtp.mailfrom=hisilicon.com; arc=none smtp.client-ip=45.249.212.190 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=hisilicon.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=hisilicon.com Received: from mail.maildlp.com (unknown [172.19.88.214]) by szxga04-in.huawei.com (SkyGuard) with ESMTP id 4X48Dc5k62z20nvl; Thu, 12 Sep 2024 15:28:16 +0800 (CST) Received: from dggpeml500019.china.huawei.com (unknown [7.185.36.137]) by mail.maildlp.com (Postfix) with ESMTPS id B32DC1A016C; Thu, 12 Sep 2024 15:28:23 +0800 (CST) Received: from localhost.localdomain (10.90.30.45) by dggpeml500019.china.huawei.com (7.185.36.137) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2507.39; Thu, 12 Sep 2024 15:28:23 +0800 From: Jie Zhan To: , , , , CC: , , , , , , , , , , , Subject: [PATCH v2 1/3] cppc_cpufreq: Return desired perf in ->get() if feedback counters are 0 Date: Thu, 12 Sep 2024 15:22:29 +0800 Message-ID: <20240912072231.439332-2-zhanjie9@hisilicon.com> X-Mailer: git-send-email 2.30.0 In-Reply-To: <20240912072231.439332-1-zhanjie9@hisilicon.com> References: <20240912072231.439332-1-zhanjie9@hisilicon.com> Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: dggems706-chm.china.huawei.com (10.3.19.183) To dggpeml500019.china.huawei.com (7.185.36.137) The CPPC performance feedback counters could return 0 when the target cpu is in a deep idle state, e.g. powered off, and those counters are not powered. In this case, cppc_cpufreq_get_rate() returns 0, and hence, cpufreq_online() gets a false error and doesn't generate a cpufreq policy, which happens in cpufreq_add_dev() when a new cpu device is added. Don't take it as an error and return the frequency corresponding to the desired perf when the feedback counters are 0. Fixes: 6a4fec4f6d30 ("cpufreq: cppc: cppc_cpufreq_get_rate() returns zero in all error cases.") Signed-off-by: Jie Zhan Reviewed-by: Zeng Heng Reviewed-by: Ionela Voinescu --- drivers/cpufreq/cppc_cpufreq.c | 19 +++++++++++++++++-- 1 file changed, 17 insertions(+), 2 deletions(-) diff --git a/drivers/cpufreq/cppc_cpufreq.c b/drivers/cpufreq/cppc_cpufreq.c index bafa32dd375d..6aa3af56924b 100644 --- a/drivers/cpufreq/cppc_cpufreq.c +++ b/drivers/cpufreq/cppc_cpufreq.c @@ -748,18 +748,33 @@ static unsigned int cppc_cpufreq_get_rate(unsigned int cpu) ret = cppc_get_perf_ctrs(cpu, &fb_ctrs_t0); if (ret) - return 0; + goto out_err; udelay(2); /* 2usec delay between sampling */ ret = cppc_get_perf_ctrs(cpu, &fb_ctrs_t1); if (ret) - return 0; + goto out_err; delivered_perf = cppc_perf_from_fbctrs(cpu_data, &fb_ctrs_t0, &fb_ctrs_t1); return cppc_perf_to_khz(&cpu_data->perf_caps, delivered_perf); + +out_err: + /* + * Feedback counters could be 0 when cores are powered down. + * Take desired perf for reflecting frequency in this case. + */ + if (ret == -EFAULT) { + ret = cppc_get_desired_perf(cpu, &delivered_perf); + if (ret) + return 0; + + return cppc_perf_to_khz(&cpu_data->perf_caps, delivered_perf); + } + + return 0; } static int cppc_cpufreq_set_boost(struct cpufreq_policy *policy, int state)