On 01/09/23 23:29, Jon Hunter wrote:
On 01/09/2023 17:41, 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>
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Same here.
Jon
This patch is newly added in v2.
Thank you,
Sumit Gupta
