Rockbox

  • Status Closed
  • Percent Complete
    100%
  • Task Type Patches
  • Category Operating System/Drivers
  • Assigned To No-one
  • Operating System iPod 3G
  • Severity Low
  • Priority Very Low
  • Reported Version
  • Due in Version Undecided
  • Due Date Undecided
  • Votes
  • Private
Attached to Project: Rockbox
Opened by dan_a - 2006-07-20

FS#5686 - CPU Frequency scaling for iPod 3g

This patch implements CPU frequency scaling on the 3G iPod.
It uses a default frequency of 24MHz, a normal frequency of 30MHz and a maximum of 90MHz.
Although the PP5002 is rated to run at 90MHz, I believe that the normal iPod firmware does not run it at more than 75MHz, so we may wish to think about using that as the maximum.
This patch improves playback performance. It should also improve battery life when not playing.

(application/octet-stream)    3g-adjustable-cpu.diff (2.9 KiB)
Closed by  linuxstb
2006-07-24 23:48
Reason for closing:  Accepted
dan_a commented on 2006-07-23 22:33

Updated version:
Is not malformed
Leaves the maximum frequency at 75MHz

I have tested the effects of changing the CPU frequency in the debug menu while playing music, and the frequency scaling is definitely taking place.

(application/octet-stream)    3g-adjustable-cpu2.diff (1.6 KiB)

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