From: rosslagerwall@gmail.com
To: Vinson Lee <vlee@twopensource.com>
Cc: stable@vger.kernel.org, "Rafael J. Wysocki" <rjw@rjwysocki.net>,
Viresh Kumar <viresh.kumar@linaro.org>,
cpufreq@vger.kernel.org, linux-pm@vger.kernel.org,
Len Brown <len.brown@intel.com>,
"Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Subject: Re: [stable request <=3.7] acpi-cpufreq: set current frequency based on target P-State
Date: Tue, 25 Mar 2014 22:18:03 +0000 [thread overview]
Message-ID: <20140325221803.GA32518@hobo.lan> (raw)
In-Reply-To: <1395785057-28903-1-git-send-email-vlee@twopensource.com>
On Tue, Mar 25, 2014 at 03:04:16PM -0700, Vinson Lee wrote:
> Hi.
>
> Please backport upstream commit 8673b83bf2f013379453b4779047bf3c6ae387e4
> "acpi-cpufreq: set current frequency based on target P-State" to stable
> kernels 3.7 and earlier. This patch enables the kernel to control
> P-states on several platforms. Without this patch, the kernel was unable
> to control P-states on the same platforms.
>
> The upstream patch cleanly applies to 3.7.
>
> A backported patch is needed with the removal of SYSTEM_AMD_MSR_CAPABLE
> for kernels 3.6 and earlier.
>
I seem to recall that the problem was a regression introduced by commit
5a1c0228 (cpufreq: Avoid calling cpufreq driver's target() routine if
target_freq == policy->cur) which was introduced in the 3.8 cycle. Are
you sure it is necessary for kernels < 3.8?
Regards
--
Ross Lagerwall
next prev parent reply other threads:[~2014-03-25 22:18 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-20 2:14 [stable request <=3.5] acpi-cpufreq: set current frequency based on target P-State Vinson Lee
2013-12-20 8:19 ` Ross Lagerwall
2014-03-25 22:04 ` [stable request <=3.7] " Vinson Lee
2014-03-25 22:04 ` [PATCH] " Vinson Lee
2014-03-25 22:18 ` rosslagerwall [this message]
2014-03-25 22:53 ` [stable request <=3.7] " Vinson Lee
2014-03-26 7:22 ` rosslagerwall
2014-04-11 16:05 ` Greg KH
2014-03-31 8:50 ` Luís Henriques
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