Rockbox

  • Status Closed
  • Percent Complete
    100%
  • Task Type Patches
  • Category Battery/Charging
  • Assigned To No-one
  • Operating System All players
  • Severity Low
  • Priority Very Low
  • Reported Version Release 3.6
  • Due in Version Undecided
  • Due Date Undecided
  • Votes
  • Private
Attached to Project: Rockbox
Opened by funman - 2010-09-02
Last edited by funman - 2010-09-05

FS#11597 - AMSv1: improve battery life

Gives ~ +20% battery life

Changes cpu freq by CGU_PROC instead of using fastbus/synchronous
Also removes setting for asynchronous

Tested on clipv1/fuzev1

Problem: long home press seems to be broken on fuzev1?

Closed by  funman
2010-09-05 15:34
Reason for closing:  Accepted
Additional comments about closing:  

committed v4 patch with some comments: r28000

This is more correct, in synchronous mode cpu clock must be > pclk/hclk (and an integer multiple of it)

My home button has a problem with SVN too so it’s not related

Clipv1: 10h runtime

e200v2: 19:22:49 runtime

fuzev1 SVN r27965 12:23, with patch 16:35

I got 22hours on fuzev1 but something definitely went wrong

2 consecutive lines are:

01:08:12, 04092, 092%, 13:40, 4088, -, -, -
14:15:46, 51346, 091%, 13:36, 4075, -, -, -

It seems somehow the player was sleeping in some state all night until I looked at the battery level in the morning (I didn’t press resume, and the config has nothing weird)

- Base PCLK off PLLA and not FCLK, so PCLK is not divided by 4 when unboosted

Not sure if the battery gains will still be there

Another idea to try:

- reduce FCLK to maximum (use maximum dividers and the 24MHz crystal as source) when unboosted

Also it might be interesting to try a build with PCLK set to 15.5MHz to see if it compare equally to previous results

I got 13h30 with the v2 patch on clipv1. An older benchmark for this player gave me 10h59m.

With v4 patch:
- fuzev1 15h30
- clipv1 8h50

e200v2 with v4 patch: 16:45:56 runtime

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