From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Tue, 31 Mar 2020 02:55:39 +0000 (-0700)
Subject: Merge tag 'x86-timers-2020-03-30' of git://git.kernel.org/pub/scm/linux/kernel/git... 
X-Git-Tag: v5.10.7~2971
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=458ef2a25e0cbdc216012aa2b9cf549d64133b08;p=platform%2Fkernel%2Flinux-rpi.git

Merge tag 'x86-timers-2020-03-30' of git://git./linux/kernel/git/tip/tip

Pull x86 timer updates from Thomas Gleixner:
 "A series of commits to make the MSR derived CPU and TSC frequency more
  accurate.

  It turned out that the frequency tables which have been taken from the
  SDM are inaccurate because the SDM provides truncated and rounded
  values, e.g. 83.3Mhz (83.3333...) or 116.7Mhz (116.6666...).

  This causes time drift in the range of ~1 second per hour (20-30
  seconds per day). On some of these SoCs it's not possible to
  recalibrate the TSC because there is no reference (PIT, HPET)
  available.

  With some reverse engineering it was established that the possible
  frequencies are derived from the base clock with fixed multiplier /
  divider pairs.

  For the CPU models which have a known crystal frequency the kernel now
  uses multiplier / divider pairs which bring the frequencies closer to
  reality and fix the observed time drift issues"

* tag 'x86-timers-2020-03-30' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/tsc_msr: Make MSR derived TSC frequency more accurate
  x86/tsc_msr: Fix MSR_FSB_FREQ mask for Cherry Trail devices
  x86/tsc_msr: Use named struct initializers
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458ef2a25e0cbdc216012aa2b9cf549d64133b08