Am Sat, 12 Nov 2016 00:52:02 +0200 hat Grazvydas Ignotas notasas@gmail.com geschrieben:
Hi,
Another idea I had: Can ANY voltage be defined in the board file?
The palmas manual states that 0.5V - 1.65V can be programmed in 0.01V steps. Device tree specifies a bit narrower range of 0.6 - 1.5V, just to be safe I guess.
Thanks. Then it should be fine here.
The OMAP manual says the allowed range is 0.85V - 1.25V. "The voltage at the device ball should never be below the MIN voltage or above the MAX voltage for any amount of time. This requirement includes dynamic voltage events such as AC ripple, voltage transients, voltage dips, etc."
Hm. Then it's weird that absolutely nothing changes for me when I change the voltage.
I would've thought that there should at least be SOME difference running 1,25GHz with 1,06V (so lower than it should be) or 1,35V (higher as it should be).
But then maybe 1,06V is not enough to run with high CPU load nd 1,35V is too much.
Maybe I'll try some inbetween frequencies tomorrow. Once I found one that's really on the edge, different voltage should also show different results.
Or could it be that 1,35V / 1,45V is not allowed by the driver and the PALMAS sticks to the default voltage in case it has an illegal voltage?
I don't think so. I think Nikolaus said he has measured the voltage to be really changing, I guess he could confirm that again just in case...
Gražvydas