ACPICA: Enable sleep button on ACPI legacy wake

ACPICA commit 9383f5b01091e432c05f802a57edc20d329eec1f

Hibernation (S4) is triggered in a guest when it recieves a sleep
trigger from the hypervisor. When the guest resumes from this power
state, it does not see the sleep_enabled bit. In otherwords, the sleep
button is not enabled on waking from an S4 state. This causes
subsequent invocation of sleep state to fail in the guest.

Fix this problem by enabling the sleep button in ACPI legacy wake.

Signed-off-by: Anchal Agarwal <[email protected]>
Reviewed-by: Balbir Singh <[email protected]>
Reviewed-by: Frank van der Linden <[email protected]>
[ ek: changelog]

Link: acpica/acpica@9383f5b0
Signed-off-by: Erik Kaneda <[email protected]>
Signed-off-by: Anchal Agarwal <[email protected]>
Signed-off-by: Bob Moore <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>

Author: anchalag

drivers/acpi/acpica/hwsleep.c

@@ -300,6 +300,18 @@ acpi_status acpi_hw_legacy_wake(u8 sleep_state)
 				    [ACPI_EVENT_POWER_BUTTON].
 				    status_register_id, ACPI_CLEAR_STATUS);
 
+	/* Enable sleep button */
+
+	(void)
+	    acpi_write_bit_register(acpi_gbl_fixed_event_info
+				    [ACPI_EVENT_SLEEP_BUTTON].
+				    enable_register_id, ACPI_ENABLE_EVENT);
+
+	(void)
+	    acpi_write_bit_register(acpi_gbl_fixed_event_info
+				    [ACPI_EVENT_SLEEP_BUTTON].
+				    status_register_id, ACPI_CLEAR_STATUS);
+
 	acpi_hw_execute_sleep_method(METHOD_PATHNAME__SST, ACPI_SST_WORKING);
 	return_ACPI_STATUS(status);
 }