From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pl0-f66.google.com ([209.85.160.66]:41673 "EHLO mail-pl0-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751350AbdK1DLi (ORCPT ); Mon, 27 Nov 2017 22:11:38 -0500 Received: by mail-pl0-f66.google.com with SMTP id u14so9786195plm.8 for ; Mon, 27 Nov 2017 19:11:38 -0800 (PST) From: Viresh Kumar To: Rafael Wysocki , mroos@linux.ee Cc: Viresh Kumar , linux-pm@vger.kernel.org, Vincent Guittot , "4 . 14+" , linux-kernel@vger.kernel.org Subject: [PATCH] cpufreq: longhaul: Set transition_delay_us to 20 ms Date: Tue, 28 Nov 2017 08:41:30 +0530 Message-Id: In-Reply-To: References: Sender: stable-owner@vger.kernel.org List-ID: The commit e948bc8fbee0 ("cpufreq: Cap the default transition delay value to 10 ms") caused a regression on EPIA-M min-ITX computer where shutdown or reboot hangs occasionally with a print message like: longhaul: Warning: Timeout while waiting for idle PCI bus cpufreq: __target_index: Failed to change cpu frequency: -16 This probably happens because the cpufreq governor tries to change the frequency of the CPU faster than allowed by the hardware. With the above commit, the default transition delay comes to 10 ms for a transition_latency of 200 us. Set the default transition delay to 20 ms directly to fix this regression. Fixes: e948bc8fbee0 ("cpufreq: Cap the default transition delay value to 10 ms") Cc: 4.14+ # 4.14+ Reported-by: Meelis Roos Suggested-by: Rafael J. Wysocki Signed-off-by: Viresh Kumar --- drivers/cpufreq/longhaul.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/cpufreq/longhaul.c b/drivers/cpufreq/longhaul.c index c46a12df40dd..56eafcb07859 100644 --- a/drivers/cpufreq/longhaul.c +++ b/drivers/cpufreq/longhaul.c @@ -894,7 +894,7 @@ static int longhaul_cpu_init(struct cpufreq_policy *policy) if ((longhaul_version != TYPE_LONGHAUL_V1) && (scale_voltage != 0)) longhaul_setup_voltagescaling(); - policy->cpuinfo.transition_latency = 200000; /* nsec */ + policy->transition_delay_us = 20000; /* usec */ return cpufreq_table_validate_and_show(policy, longhaul_table); } -- 2.15.0.194.g9af6a3dea062