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-Testing suspend and resume support in device drivers
- (C) 2007 Rafael J. Wysocki <rjw@sisk.pl>, GPL
-
-1. Preparing the test system
-
-Unfortunately, to effectively test the support for the system-wide suspend and
-resume transitions in a driver, it is necessary to suspend and resume a fully
-functional system with this driver loaded. Moreover, that should be done
-several times, preferably several times in a row, and separately for hibernation
-(aka suspend to disk or STD) and suspend to RAM (STR), because each of these
-cases involves slightly different operations and different interactions with
-the machine's BIOS.
-
-Of course, for this purpose the test system has to be known to suspend and
-resume without the driver being tested. Thus, if possible, you should first
-resolve all suspend/resume-related problems in the test system before you start
-testing the new driver. Please see Documentation/power/basic-pm-debugging.txt
-for more information about the debugging of suspend/resume functionality.
-
-2. Testing the driver
-
-Once you have resolved the suspend/resume-related problems with your test system
-without the new driver, you are ready to test it:
-
-a) Build the driver as a module, load it and try the test modes of hibernation
- (see: Documentation/power/basic-pm-debugging.txt, 1).
-
-b) Load the driver and attempt to hibernate in the "reboot", "shutdown" and
- "platform" modes (see: Documentation/power/basic-pm-debugging.txt, 1).
-
-c) Compile the driver directly into the kernel and try the test modes of
- hibernation.
-
-d) Attempt to hibernate with the driver compiled directly into the kernel
- in the "reboot", "shutdown" and "platform" modes.
-
-e) Try the test modes of suspend (see: Documentation/power/basic-pm-debugging.txt,
- 2). [As far as the STR tests are concerned, it should not matter whether or
- not the driver is built as a module.]
-
-f) Attempt to suspend to RAM using the s2ram tool with the driver loaded
- (see: Documentation/power/basic-pm-debugging.txt, 2).
-
-Each of the above tests should be repeated several times and the STD tests
-should be mixed with the STR tests. If any of them fails, the driver cannot be
-regarded as suspend/resume-safe.