linaro-release team mailing list archive

[Fathi Boudra <fathi.boudra@xxxxxxxxxx>]

>From Andy:

CPU_FREQ does seem to work / work better at least on linux-linaro-2.6.39
on OMAP4 / Panda.

>From Vishwa:

There was an issue in Clock framework due to which Core DVFS in OMAP3
was not fully functional. This problem is fixed by below commit id in
mainline and same is present in .39 linaro kernel.
Patch details:
commit 5fd2a84ab3c8b87176e25db1d98c5cc34043a669
Author: Avinash H.M <avinashhm@xxxxxx>
Date:   Mon May 9 12:29:40 2011 +0000
   OMAP3: set the core dpll clk rate in its set_rate function

2.6.39 does not seem to have basic DVFS code that was pushed in 2.6.38 kernel.
So CPUFREQ will not work on 2.6.39.
I will pull this patch onto 2.6.38 linaro kernel and test cpufreq.

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https://bugs.launchpad.net/bugs/784176

Title:
  CPU_FREQ support is broken for OMAP 3 and OMAP 4

Status in Linaro Linux:
  Confirmed
Status in “linux-linaro-omap” package in Ubuntu:
  Confirmed
Status in “linux-ti-omap4” package in Ubuntu:
  Confirmed

Bug description:
  Current both Nicolas and Andy's kernel tree (2.6.38) is lacking proper
  support for CPU_FREQ. On OMAP 4 it tries to change the frequencies for
  the first CPU, and on OMAP 3 is basically freezes when calling
  cpufreq-info, besides not having a proper frequency scaling.

  The workaround now for the linux-linaro-omap kernel is to disable
  CPU_FREQ, so this bug is basically to track why it's currently
  disabled.

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