mfd: cros_ec: Send correct suspend/resume event to EC

pm_suspend_via_firmware() will return false for platforms with ACPI
disabled and ACPI is a prerequisite for S0ix support.

With this patch, sleep state event sent to EC is forced to S3 if ACPI is
disabled.
Signed-off-by: Shawn Nematbakhsh <shawnn@chromium.org>
Signed-off-by: Thierry Escande <thierry.escande@collabora.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

drivers/mfd/cros_ec.c

@@ -190,7 +190,8 @@ int cros_ec_suspend(struct cros_ec_device *ec_dev)
 	int ret;
 	u8 sleep_event;
 
-	sleep_event = pm_suspend_via_firmware() ? HOST_SLEEP_EVENT_S3_RESUME :
+	sleep_event = (!IS_ENABLED(CONFIG_ACPI) || pm_suspend_via_firmware()) ?
+		      HOST_SLEEP_EVENT_S3_RESUME :
 		      HOST_SLEEP_EVENT_S0IX_RESUME;
 
 	ret = cros_ec_sleep_event(ec_dev, sleep_event);
@@ -224,7 +225,8 @@ int cros_ec_resume(struct cros_ec_device *ec_dev)
 	ec_dev->suspended = false;
 	enable_irq(ec_dev->irq);
 
-	sleep_event = pm_suspend_via_firmware() ? HOST_SLEEP_EVENT_S3_RESUME :
+	sleep_event = (!IS_ENABLED(CONFIG_ACPI) || pm_suspend_via_firmware()) ?
+		      HOST_SLEEP_EVENT_S3_RESUME :
 		      HOST_SLEEP_EVENT_S0IX_RESUME;
 
 	ret = cros_ec_sleep_event(ec_dev, sleep_event);