linux-kernel - Re: tools/power/x86/intel-speed-select: Fixes for regression

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Date:   Mon, 4 Jan 2021 12:56:26 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        mgross@...ux.intel.com
Cc:     platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: tools/power/x86/intel-speed-select: Fixes for regression

Hi,

On 12/21/20 8:18 AM, Srinivas Pandruvada wrote:
> One side-effect of fixing the scaling frequency limits using the
> commit eacc9c5a927e ("cpufreq: intel_pstate: Fix intel_pstate_get_hwp_max()
> for turbo disabled") causes stale HWP_CAP.GUARANTEED to be used as max.
> Without processing HWP interrupts, user space needs to be able to update
> a new max while Intel SST is in use. This is not a problem as the
> change of guaranteed is caused by user space action, so user space knows
> that guarantee will change.
> 
> This series causes user space to trigger scaling_max_freq update with
> the new base_frequency.
> 
> 
> Srinivas Pandruvada (2):
>   tools/power/x86/intel-speed-select: Set scaling_max_freq to
>     base_frequency
>   tools/power/x86/intel-speed-select: Set higher of cpuinfo_max_freq or
>     base_frequency

Thank you for your patch-series, I've applied the series to my
review-hans branch:
https://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86.git/log/?h=review-hans

Note it will show up in my review-hans branch once I've pushed my
local branch there, which might take a while.

Once I've run some tests on this branch the patches there will be
added to the platform-drivers-x86/for-next branch and eventually
will be included in the pdx86 pull-request to Linus for the next
merge-window.

Regards,

Hans