Add a sysctl, 'debug.acpi.suspend_bounce', that causes the system to bounce

back in a simulated resume instead of entering the requested suspend state.
This helps in testing drivers separately from the acpi suspend code.  To
test your drivers, set debug.acpi.suspend_bounce=1 and then run
acpiconf -s3 (or 4).

MFC after:	1 day

1 files changed, 8 insertions, 0 deletions

diff --git a/sys/dev/acpica/acpi.c b/sys/dev/acpica/acpi.c
index c6dbb3b..f9b77bf 100644
--- a/sys/dev/acpica/acpi.c
+++ b/sys/dev/acpica/acpi.c
@@ -242,6 +242,10 @@ SYSCTL_INT(_debug_acpi, OID_AUTO, do_powerstate, CTLFLAG_RW,
 /* Allow users to override quirks. */
 TUNABLE_INT("debug.acpi.quirks", &acpi_quirks);
 
+static int acpi_susp_bounce;
+SYSCTL_INT(_debug_acpi, OID_AUTO, suspend_bounce, CTLFLAG_RW,
+    &acpi_susp_bounce, 0, "Don't actually suspend, just test devices.");
+
 /*
  * ACPI can only be loaded as a module by the loader; activating it after
  * system bootstrap time is not useful, and can be fatal to the system.
@@ -2198,6 +2202,10 @@ acpi_SetSleepState(struct acpi_softc *sc, int state)
 	}
 	slp_state = ACPI_SS_DEV_SUSPEND;
 
+	/* If testing device suspend only, back out of everything here. */
+	if (acpi_susp_bounce)
+	    break;
+
 	status = AcpiEnterSleepStatePrep(state);
 	if (ACPI_FAILURE(status)) {
 	    device_printf(sc->acpi_dev, "AcpiEnterSleepStatePrep failed - %s\n",