On 02/07/2013 06:19:25 AM, Thomas Waldecker wrote:
Hi Scott,
I measured the power consumption of the whole system on the tqmp2020
( http://tq-group.com/tqmp2020 )
with a QorIQ P2020.
Kernel:
root@generic-powerpc-e500v2:/sys/power# uname -a
Linux generic-powerpc-e500v2 3.7.0-rc8-00004-g6e93414 #4 SMP Tue Dec
11 08:53:23 CET 2012 ppc GNU/Linux
root@generic-powerpc-e500v2:/sys/power# cat /etc/issue
ELDK 5.2.1 \n \l
In idle using doze I got:
545mA, 18V => 9.81W
In idle using nap I got:
500mA, 18V => 9W
That's a difference of 0.81W,
0.81W/9.81W = 0.083 (8.3 %)
Thanks.
> The only way you'll get into sleep mode is through /sys/power/state.
How can I use this interface?
root@generic-powerpc-e500v2:/sys/power# ls -la
total 0
drwxr-xr-x 2 root root 0 Feb 1 15:39 .
dr-xr-xr-x 12 root root 0 Feb 1 15:19 ..
-rw-r--r-- 1 root root 4096 Feb 1 15:39 state
root@generic-powerpc-e500v2:/sys/power# cat state
root@generic-powerpc-e500v2:/sys/power# echo "sleep" > state
-sh: echo: write error: Function not implemented
root@generic-powerpc-e500v2:/sys/power# echo 0 > state
-sh: echo: write error: Function not implemented
root@generic-powerpc-e500v2:/sys/power#
Make sure that CONFIG_FSL_PMC is enabled, and that you have a pmc node
in the device tree. You'll only have standby, not sleep. mpc8536 and
p1022 can support what the chip calls "deep sleep" and is exposed as
"sleep" rather than "standby", but it doesn't look like the code for
that has made it into mainline Linux yet.
-Scott
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