2007-11-19 23:43:34 +01:00
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2007-05-08 00:24:07 -07:00
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2007-11-19 23:43:34 +01:00
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2007-05-08 00:24:07 -07:00
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2007-11-19 23:43:34 +01:00
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2007-05-08 00:24:07 -07:00
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2007-11-19 23:43:34 +01:00
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2012-01-19 23:22:38 +01:00
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2007-11-19 23:43:34 +01:00
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2007-05-08 00:24:07 -07:00
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2007-11-19 23:43:34 +01:00
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2007-05-08 00:24:07 -07:00
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2007-11-19 23:43:34 +01:00
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2007-05-08 00:24:07 -07:00
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2007-11-19 23:43:34 +01:00
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2007-05-08 00:24:07 -07:00
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2007-11-19 23:43:34 +01:00
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2007-05-08 00:24:07 -07:00
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2007-11-19 23:43:34 +01:00
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2007-05-08 00:24:07 -07:00
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PM / sleep: add configurable delay for pm_test
When CONFIG_PM_DEBUG=y, we provide a sysfs file (/sys/power/pm_test) for
selecting one of a few suspend test modes, where rather than entering a
full suspend state, the kernel will perform some subset of suspend
steps, wait 5 seconds, and then resume back to normal operation.
This mode is useful for (among other things) observing the state of the
system just before entering a sleep mode, for debugging or analysis
purposes. However, a constant 5 second wait is not sufficient for some
sorts of analysis; for example, on an SoC, one might want to use
external tools to probe the power states of various on-chip controllers
or clocks.
This patch turns this 5 second delay into a configurable module
parameter, so users can determine how long to wait in this
pseudo-suspend state before resuming the system.
Example (wait 30 seconds);
# echo 30 > /sys/module/suspend/parameters/pm_test_delay
# echo core > /sys/power/pm_test
# time echo mem > /sys/power/state
...
[ 17.583625] suspend debug: Waiting for 30 second(s).
...
real 0m30.381s
user 0m0.017s
sys 0m0.080s
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Acked-by: Pavel Machek <pavel@ucw.cz>
Reviewed-by: Kevin Cernekee <cernekee@chromium.org>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2015-02-22 21:16:49 -08:00
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2007-11-19 23:43:34 +01:00
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PM / sleep: add configurable delay for pm_test
When CONFIG_PM_DEBUG=y, we provide a sysfs file (/sys/power/pm_test) for
selecting one of a few suspend test modes, where rather than entering a
full suspend state, the kernel will perform some subset of suspend
steps, wait 5 seconds, and then resume back to normal operation.
This mode is useful for (among other things) observing the state of the
system just before entering a sleep mode, for debugging or analysis
purposes. However, a constant 5 second wait is not sufficient for some
sorts of analysis; for example, on an SoC, one might want to use
external tools to probe the power states of various on-chip controllers
or clocks.
This patch turns this 5 second delay into a configurable module
parameter, so users can determine how long to wait in this
pseudo-suspend state before resuming the system.
Example (wait 30 seconds);
# echo 30 > /sys/module/suspend/parameters/pm_test_delay
# echo core > /sys/power/pm_test
# time echo mem > /sys/power/state
...
[ 17.583625] suspend debug: Waiting for 30 second(s).
...
real 0m30.381s
user 0m0.017s
sys 0m0.080s
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Acked-by: Pavel Machek <pavel@ucw.cz>
Reviewed-by: Kevin Cernekee <cernekee@chromium.org>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2015-02-22 21:16:49 -08:00
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2007-11-19 23:43:34 +01:00
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2007-05-08 00:24:07 -07:00
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2007-11-19 23:43:34 +01:00
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2007-05-08 00:24:07 -07:00
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2007-11-19 23:43:34 +01:00
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2007-05-08 00:24:07 -07:00
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2007-11-19 23:43:34 +01:00
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2007-05-08 00:24:07 -07:00
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2016-08-13 02:54:04 +02:00
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2007-05-08 00:24:07 -07:00
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2007-11-19 23:43:34 +01:00
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2013-12-22 11:31:41 +01:00
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2011-08-15 02:02:26 +02:00
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2007-05-08 00:24:07 -07:00
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2013-08-21 21:03:09 -07:00
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2007-11-19 23:43:34 +01:00
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2013-08-21 21:03:09 -07:00
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2007-11-19 23:43:34 +01:00
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PM / Suspend: Add statistics debugfs file for suspend to RAM
Record S3 failure time about each reason and the latest two failed
devices' names in S3 progress.
We can check it through 'suspend_stats' entry in debugfs.
The motivation of the patch:
We are enabling power features on Medfield. Comparing with PC/notebook,
a mobile enters/exits suspend-2-ram (we call it s3 on Medfield) far
more frequently. If it can't enter suspend-2-ram in time, the power
might be used up soon.
We often find sometimes, a device suspend fails. Then, system retries
s3 over and over again. As display is off, testers and developers
don't know what happens.
Some testers and developers complain they don't know if system
tries suspend-2-ram, and what device fails to suspend. They need
such info for a quick check. The patch adds suspend_stats under
debugfs for users to check suspend to RAM statistics quickly.
If not using this patch, we have other methods to get info about
what device fails. One is to turn on CONFIG_PM_DEBUG, but users
would get too much info and testers need recompile the system.
In addition, dynamic debug is another good tool to dump debug info.
But it still doesn't match our utilization scenario closely.
1) user need write a user space parser to process the syslog output;
2) Our testing scenario is we leave the mobile for at least hours.
Then, check its status. No serial console available during the
testing. One is because console would be suspended, and the other
is serial console connecting with spi or HSU devices would consume
power. These devices are powered off at suspend-2-ram.
Signed-off-by: ShuoX Liu <shuox.liu@intel.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2011-08-10 23:01:26 +02:00
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