Thread (15 messages) 15 messages, 7 authors, 2004-01-24

Re: keyboard and USB problems (Re: 2.6.2-rc1-mm2)

From: john stultz <hidden>
Date: 2004-01-23 19:28:08
Also in: lkml

On Fri, 2004-01-23 at 08:19, Vojtech Pavlik wrote:
On Fri, Jan 23, 2004 at 05:01:52PM +0100, Rudo Thomas wrote: 
quoted
BogoMIPS is figured out to be 8.19 (this was already reported by another user),
... this the root cause of the following problems.
quoted
and i8042.c complaints with this:
i8042.c: Can't write CTR while closing AUX.
... bogomips is used in udelay() and that's used for waiting. If
bogomips is measured lower than real, the wait takes shorter and the
hardware doesn't do what it should in that short time.
Well, loops_per_jiffy is actually being measured correctly as we're
using the acpi pm timesource to time udelay(). However there is a loss
of resolution using the slower time source, so udelay(1) might take
longer then 1 us. 

If that is going to cause problems, then we'll need to pull out the
use-pmtmr-for-delay_pmtmr patch. I guess our only option is then to use
the TSC for delay_pmtrm() (as a loop based delay fails in other cases).
I'll write that up and send it your way, Andrew. 

thanks
-john


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