From: Jon Hunter <jonathanh@nvidia.com>
To: Sumit Gupta <sumitg@nvidia.com>,
rafael@kernel.org, viresh.kumar@linaro.org,
linux-pm@vger.kernel.org, linux-tegra@vger.kernel.org,
linux-kernel@vger.kernel.org
Cc: treding@nvidia.com, bbasu@nvidia.com
Subject: Re: [Patch] driver: cpufreq: use refclk delta based loop instead of udelay
Date: Fri, 1 Sep 2023 16:58:27 +0100 [thread overview]
Message-ID: <c2bc6447-d8de-4f0f-d735-df377ab40f1c@nvidia.com> (raw)
In-Reply-To: <20230901152046.25662-1-sumitg@nvidia.com>
On 01/09/2023 16:20, Sumit Gupta wrote:
> Use reference clock count based loop instead of "udelay()" for
> sampling of counters to improve the accuracy of re-generated CPU
> frequency. "udelay()" internally calls "WFE" which stops the
> counters and results in bigger delta between the last set freq
> and the re-generated value from counters. The counter sampling
> window used in loop is the minimum number of reference clock
> cycles which is known to give a stable value of CPU frequency.
> The change also helps to reduce the sampling window from "500us"
> to "<50us".
>
> Suggested-by: Antti Miettinen <amiettinen@nvidia.com>
> Signed-off-by: Sumit Gupta <sumitg@nvidia.com>
Please can you correct the subject and drop the 'driver:'.
Jon
--
nvpublic
next prev parent reply other threads:[~2023-09-01 15:58 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-01 15:20 Sumit Gupta
2023-09-01 15:58 ` Jon Hunter [this message]
2023-09-01 16:49 ` Sumit Gupta
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