greybus: arche-platform: Avoid doing same thing again in poweroff fn

If user switches from fw_flashing => off mode, then we do not need
to do same things again, for example, clk_disable and wake/detect event,
as while switching to fw_flashing, driver makes sure that device goes
to off state and then brings back in fw_flashing state.

Testing Done: Tested on DB3.5 platform.
Signed-off-by: Vaibhav Hiremath <vaibhav.hiremath@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/staging/greybus/arche-platform.c

@@ -185,11 +185,15 @@ static void arche_platform_poweroff_seq(struct arche_platform_drvdata *arche_pda
 	if (arche_pdata->state == ARCHE_PLATFORM_STATE_OFF)
 		return;
 
-	/* Send disconnect/detach event to SVC */
-	gpio_set_value(arche_pdata->wake_detect_gpio, 0);
-	usleep_range(100, 200);
+	/* If in fw_flashing mode, then no need to repeate things again */
+	if (arche_pdata->state != ARCHE_PLATFORM_STATE_FW_FLASHING) {
+		/* Send disconnect/detach event to SVC */
+		gpio_set_value(arche_pdata->wake_detect_gpio, 0);
+		usleep_range(100, 200);
+
+		clk_disable_unprepare(arche_pdata->svc_ref_clk);
+	}
 
-	clk_disable_unprepare(arche_pdata->svc_ref_clk);
 	/* As part of exit, put APB back in reset state */
 	svc_reset_onoff(arche_pdata->svc_reset_gpio,
 			arche_pdata->is_reset_act_hi);