Re: [ANNOUNCE] updated PM branch

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Op 18 dec 2008, om 00:53 heeft Kevin Hilman het volgende geschreven:

Koen Kooi wrote:
Op 17 dec 2008, om 19:34 heeft Kevin Hilman het volgende geschreven:
Kevin Hilman <khilman@xxxxxxxxxxxxxxxxxxx> writes:

The PM branch has been consolidated and rebased against today's
linux-omap HEAD. I've also included a few patches that were posted to
the list that had fallen through the cracks.

I did a couple minor updates to to the pm branch, and rebased it to
current HEAD.  The updates include

- more patch consolidation
- VDD2 patch from Rajendra
- updated IVA2 reset patch which actually works :)
- included the GPTIMER12 fixes for Beagle

I also tested on Beagle.  Here are some results when using a minimal
defconfig (attached) and using an initramfs. I had to disable MMC and
USB as they are currently preventing the low-level chip retention:

I tested this on the latest PM branch of linux-omap:

- boot idle: 342 mA

- screen blank: 238 mA
# echo 3 > /sys/class/graphics/fb0/blank

- suspend: 85 mA
# echo 1 > /sys/power/clocks_off_while_idle
# echo mem > /sys/power/state

- sleep-while-idle: 85 mA
- this same state as suspend, but happens in idle
# echo 1 > /sys/power/sleep_while_idle

This is with current PM branch of linux-omap.  I understand that
Tomi's new DSS tree has support to turn off the DVI framer which
should save even more power, but I have not tested that.
Try toggling GPIO 170 manually, current consumption should drop with 60-80mA.

That didn't seem to change anything for me.

Looking closer, drivers/video/omap/lcd_omap3beagle.c is already toggling
GPIO 170 in current linux-omap.

Ah, so I did a better job with copy/pasting together the lcd driver than I thought :)

So the ~80mA drop above between 'boot idle' and 'screen blank' is probably already counting the DVI framer.

I suspected the 80mA drop was a bit much for just putting the DSS system into sleep, hence my gpio suggestion :) Thanks for confirming it.

regards,

Koen



Kevin


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