From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wang Weidong Subject: Re: [PATCH 0/2] fix some problems for cpufreq Date: Sat, 29 Nov 2014 09:40:02 +0800 Message-ID: <547923F2.6000701@huawei.com> References: <1417142619-14548-1-git-send-email-wangweidong1@huawei.com> <2248504.pAVebap2qN@vostro.rjw.lan> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Return-path: Received: from szxga02-in.huawei.com ([119.145.14.65]:15554 "EHLO szxga02-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751431AbaK2Bkc (ORCPT ); Fri, 28 Nov 2014 20:40:32 -0500 In-Reply-To: <2248504.pAVebap2qN@vostro.rjw.lan> Sender: linux-pm-owner@vger.kernel.org List-Id: linux-pm@vger.kernel.org To: "Rafael J. Wysocki" Cc: viresh.kumar@linaro.org, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, guohanjun@huawei.com On 2014/11/29 9:26, Rafael J. Wysocki wrote: > On Friday, November 28, 2014 10:43:37 AM Wang Weidong wrote: >> Hi Rafael and Viresh >> >> Sorry to trouble you again. As for: >> "acpi-cpufreq: get the cur_freq from acpi_processor_performance states" >> I do it again, and add the other patch. >> >> patch #1: acpi-cpufreq: make the freq_table store the same freq value >> >> I think it can work. The set of available states which come >> from acpi won't change. Just like the power would be remove, >> the acpi driver will do that: >> call >> ->acpi_processor_ppc_has_changed >> ->cpufreq_update_policy >> ->acpi_ppc_notifier_block.notifier_call >> ->acpi_processor_ppc_notifier >> ->cpufreq_verify_within_limits >> The progress will change the policy's min_freq and max_freq >> while it won't change the set of states(freq_tables). > > OK, so the above information needs to go into the changelog of patch [1/2]. > Also, please clarify the problem description in that changelog, it is very > difficult to understand the way it is now. > sure, I should do it. >> patch #2: cpufreq: show the real avail freqs with the freq_table >> >> when the min_freq and max_freq change, we should sync the availble >> freqs. > > Why? Do any other cpufreq drivers do that? > If some cpufreq drivers support several freqs like this: 1.05 Ghz 1.30Ghz 1.70GHz 2.10GHz 2.3GHz | | min max So what the available freqs is 1.30GHz 1.70GHz 2.10GHz when we do cpufreq-info or cat scaling_available_frequencies, I think the available freqs table show only show these 3 value, not all the values. Wang, Regards > Rafael > > > . >