From patchwork Thu Sep 12 07:20:00 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jie Zhan X-Patchwork-Id: 13801544 Received: from szxga07-in.huawei.com (szxga07-in.huawei.com [45.249.212.35]) (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 18C8C18C321; Thu, 12 Sep 2024 07:25:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.35 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726125959; cv=none; b=uilU6Wlw1twuN0uFzTEOOw2mpMR+fYadGiNUd13OwVFQ1XOv5Gk8kxuDb6URbULUxhj7Sbhc/+lQ8dfe4aTh1zkUoRwOwKwijYq6+3UNuUsX7EJHzmh7FRooDwXXl6Jpj9/AdwK7FYQK9QAFie8mLoJIen1uOGpgL98fpUKBCeE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726125959; c=relaxed/simple; bh=JotTQJcuWSc00JIJPC8d+bnar+Q9+Y541r+0jRM3BAI=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=Q4JEAt/N8drPgF8rfInuRgx1vpUdWLxp8cMz10CoQEJ1NsZ2WV+fEfgMYrrym6vjMjwhuX1ANmP4fz/rUtqGUnXHFryTpiVsQpwZ8+GjPImRKMM7mPcOWdGXyuR3zPrvC7glaHLPv5ALAz1mczwmZR76JoVGoi9v4mUIMDClSLE= 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=45.249.212.35 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 [172.19.88.234]) by szxga07-in.huawei.com (SkyGuard) with ESMTP id 4X489H3y8dz1SB9w; Thu, 12 Sep 2024 15:25:23 +0800 (CST) Received: from dggpeml500019.china.huawei.com (unknown [7.185.36.137]) by mail.maildlp.com (Postfix) with ESMTPS id 9385E1401F4; Thu, 12 Sep 2024 15:25:54 +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 15:25:54 +0800 From: Jie Zhan To: , , , , CC: , , , , , , , , , , , Subject: [PATCH v2 2/3] cppc_cpufreq: Return latest desired perf if feedback counters don't change Date: Thu, 12 Sep 2024 15:20:00 +0800 Message-ID: <20240912072001.433980-3-zhanjie9@hisilicon.com> X-Mailer: git-send-email 2.30.0 In-Reply-To: <20240912072001.433980-1-zhanjie9@hisilicon.com> References: <20240912072001.433980-1-zhanjie9@hisilicon.com> Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: dggems702-chm.china.huawei.com (10.3.19.179) To dggpeml500019.china.huawei.com (7.185.36.137) The existing cppc_perf_from_fbctrs() returns a cached desired perf if the delta of feedback counters is 0. Some platforms may update the real frequency back to the desired perf reg. Try getting the latest desired perf first; if failed, return the cached desired perf. Signed-off-by: Jie Zhan Reviewed-by: Zeng Heng --- drivers/cpufreq/cppc_cpufreq.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) diff --git a/drivers/cpufreq/cppc_cpufreq.c b/drivers/cpufreq/cppc_cpufreq.c index 6aa3af56924b..c8fe0f1fc22b 100644 --- a/drivers/cpufreq/cppc_cpufreq.c +++ b/drivers/cpufreq/cppc_cpufreq.c @@ -715,7 +715,8 @@ static int cppc_perf_from_fbctrs(struct cppc_cpudata *cpu_data, struct cppc_perf_fb_ctrs *fb_ctrs_t1) { u64 delta_reference, delta_delivered; - u64 reference_perf; + u64 reference_perf, desired_perf; + int cpu, ret; reference_perf = fb_ctrs_t0->reference_perf; @@ -725,8 +726,14 @@ static int cppc_perf_from_fbctrs(struct cppc_cpudata *cpu_data, fb_ctrs_t0->delivered); /* Check to avoid divide-by zero and invalid delivered_perf */ - if (!delta_reference || !delta_delivered) - return cpu_data->perf_ctrls.desired_perf; + if (!delta_reference || !delta_delivered) { + cpu = cpumask_first(cpu_data->shared_cpu_map); + ret = cppc_get_desired_perf(cpu, &desired_perf); + if (ret) + return cpu_data->perf_ctrls.desired_perf; + + return desired_perf; + } return (reference_perf * delta_delivered) / delta_reference; }