[Gta04-owner] Same GTA04 - now 33% faster :-)

[NeilBrown]

On Wed, 25 Jul 2012 09:25:36 +0200 Radek Polak <psonek2 at seznam.cz> wrote:

> On Wednesday, July 25, 2012 03:59:59 AM NeilBrown wrote:
> 
> > Sometimes bugs can be really useful.
> > A patch that went into 3.5 causes the GTA04 to hang whenever the MPU clock
> > speed is raised to 800MHz.  Apparently something to do with power routing -
> > don't know the full story yet.
> > 
> > But while investigating this I discovered that my 3.x kernels were not
> > pushing the GTA04 to 800MHz except for a moment or two at boot.  As soon
> > as cpufreq is enabled, they drop back to 300MHz or 600MHz and never go back
> > up again.
> > 
> > So I copied some code from board-omap3beagle.c and now get 800MHz on
> > demand. The required patches have been published in my 3.5 branches.
> > 
> > So it isn't really that it is now 33% faster, but more that all this time
> > it has been 25% slower than it should have been.
> 
> Does this apply also to 3.2 kernel?

I suspect so.  There has been no change to the code in board-omap3beagle.c
since just before 3.2, so same code should work on GTA04 in 3.2

This is all you should need:

http://neil.brown.name/git?p=gta04;a=commitdiff;h=74526193da1b1b949df3b11034f4682420e41cc7

If you can confirm that it works on 3.2 I'll add it to my tree.

/sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies

should list the frequencies that are available for cpufreq to use.

NeilBrown
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 828 bytes
Desc: not available
URL: <http://lists.goldelico.com/pipermail/gta04-owner/attachments/20120725/8cb37b70/attachment.bin>