Diffstat (limited to 'Documentation/power/drivers-testing.txt')
1 files changed, 42 insertions, 0 deletions
diff --git a/Documentation/power/drivers-testing.txt b/Documentation/power/drivers-testing.txt
new file mode 100644
@@ -0,0 +1,42 @@
+Testing suspend and resume support in device drivers
+ (C) 2007 Rafael J. Wysocki <firstname.lastname@example.org>, 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 the suspend
+to disk (STD) and the suspend to RAM (STR) transitions, because each of these
+cases involves different ordering of 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 Documents/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 STD in the test mode (see:
+b) Load the driver and attempt to suspend to disk in the "reboot", "shutdown"
+and "platform" modes (see: Documents/power/basic-pm-debugging.txt, 1).
+c) Compile the driver directly into the kernel and try the STD in the test mode.
+d) Attempt to suspend to disk with the driver compiled directly into the kernel
+in the "reboot", "shutdown" and "platform" modes.
+e) Attempt to suspend to RAM using the s2ram tool with the driver loaded (see:
+Documents/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.
+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.