Re: [Patch] driver: cpufreq: use refclk delta based loop instead of udelay

From: Jon Hunter
Date: Fri Sep 01 2023 - 11:58:39 EST




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@xxxxxxxxxx>
Signed-off-by: Sumit Gupta <sumitg@xxxxxxxxxx>


Please can you correct the subject and drop the 'driver:'.

Jon

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