[AM3715] ABB 1Ghz Operation

Mike Turquette originally worked on this and has posted a patch that your customer should test.   Mike will not be working on this in the future, and I will pick up the support of this item.  Please let me know if the customer has tested this patch, and what the result was.

Here is Mike's last comment on the subject:

In case anyone wants to test these ABB patches they can be found here: https://github.com/mturquette/linux/tree/v3.6-rc7-abb; git://github.com/mturquette/linux.git v3.6-rc7-abb

I'm going to rebase those and fixup some checkpatch issues as well as one spooky boot-time corner case where ABB doesn't do the right thing when we boot at a fast OPP.  Please give me any feedback on code or testing.

Hi.

I retried 1GHz operation on an AM3703 platform using the patches from https://github.com/mturquette/linux/commits/v3.6-rc7-abb-rebase2.  I see the following message in the boot log:

voltdm_scale: abb prescale failed for vddmpu_iva: -61

When I try to change frequency, I get this:

root@omap3-multi:~# cpufreq-set -f 1G
[ 376.571014] omap_voltage_get_voltdata: Unable to match the current voltage with the voltagetable for vdd_mpu_iva
[ 376.583038] voltdm_scale: abb prescale failed for vddmpu_iva: -61
[ 376.589447] platform mpu.0: omap_target: unable to scale voltage up.

The vdd_bb_mpu_iva remains at 1.2V.

I don't remember running into these errors previously but still having unstable operation on this branch so perhaps I'm missing a config. option.

Did these patches break the ability to change frequency, or were you unable to use "cpufreq-set -f 1G" prior to these patches?

Unfortunately, these patches break the ability to use cpufreq.