Messages in this thread | | | Date | Tue, 25 Feb 2003 20:33:42 +0100 | From | Pavel Machek <> | Subject | Re: cpufreq: allow user to specify voltage |
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Hi!
> > So I guess adding /sys/bus/system/devices/cpu0/voltage? Should code to > > do that be in kernel/cpufreq.c or is it possible to do sysfs from > > powernow-k7 [it does not seem easy]? > Pavel > I agree, there shoul dbe a way to add sysfs files from a cpufreq driver > module. I told dave I was looking into overriding the powernow tables, > but I can't seem to get enough time away from my day job right now. > > for the powernow driver, and the userspace governor, I'd like to export a > file "current_setting" or something that contains: > > <frequency> <voltage> <fsb? maybe for other drivers> > > A write to this file of one, two, or three values would result in changing > the frequency to the closest standard table match we have. Unless, the > user specifies an "override" flag as a module parameter. If the override > flag is set, then writing to that file will set the speed and voltage to > exactly what you specify (within the min/max hardware limits), and > basically ignore the standard BIOS table.
Actually I think sysfs is trying to get it into one-file-per-value...
...which is going to be problem for writing because it will not be able to atomically update different values at once...
Oh and forget module parameter :-). Pavel -- Horseback riding is like software... ...vgf orggre jura vgf serr. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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