wlcore: Simplify runtime resume ELP path

We can simplify the runtime resume ELP path by always setting and
clearing the completion in runtime resume. This way we can test for
WL1271_FLAG_IRQ_RUNNING after the resume write to see if we need
completion at all.

And in wlcore_irq(), we need to take spinlock for running the
completion and for the pm_wakeup_event(). Spinlock is not needed
around the bitops flags check for WL1271_FLAG_SUSPENDED so the
spinlocked sections get shorter.
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20200702162951.45392-2-tony@atomide.com

drivers/net/wireless/ti/wlcore/main.c

@@ -649,24 +649,26 @@ static irqreturn_t wlcore_irq(int irq, void *cookie)
 	unsigned long flags;
 	struct wl1271 *wl = cookie;
 
-	/* complete the ELP completion */
-	spin_lock_irqsave(&wl->wl_lock, flags);
 	set_bit(WL1271_FLAG_IRQ_RUNNING, &wl->flags);
-	if (wl->elp_compl) {
-		complete(wl->elp_compl);
-		wl->elp_compl = NULL;
+
+	/* complete the ELP completion */
+	if (test_bit(WL1271_FLAG_IN_ELP, &wl->flags)) {
+		spin_lock_irqsave(&wl->wl_lock, flags);
+		if (wl->elp_compl)
+			complete(wl->elp_compl);
+		spin_unlock_irqrestore(&wl->wl_lock, flags);
 	}
 
 	if (test_bit(WL1271_FLAG_SUSPENDED, &wl->flags)) {
 		/* don't enqueue a work right now. mark it as pending */
 		set_bit(WL1271_FLAG_PENDING_WORK, &wl->flags);
 		wl1271_debug(DEBUG_IRQ, "should not enqueue work");
+		spin_lock_irqsave(&wl->wl_lock, flags);
 		disable_irq_nosync(wl->irq);
 		pm_wakeup_event(wl->dev, 0);
 		spin_unlock_irqrestore(&wl->wl_lock, flags);
 		goto out_handled;
 	}
-	spin_unlock_irqrestore(&wl->wl_lock, flags);
 
 	/* TX might be handled here, avoid redundant work */
 	set_bit(WL1271_FLAG_TX_PENDING, &wl->flags);
@@ -6732,7 +6734,6 @@ static int __maybe_unused wlcore_runtime_resume(struct device *dev)
 	unsigned long flags;
 	int ret;
 	unsigned long start_time = jiffies;
-	bool pending = false;
 	bool recovery = false;
 
 	/* Nothing to do if no ELP mode requested */
@@ -6742,49 +6743,35 @@ static int __maybe_unused wlcore_runtime_resume(struct device *dev)
 	wl1271_debug(DEBUG_PSM, "waking up chip from elp");
 
 	spin_lock_irqsave(&wl->wl_lock, flags);
-	if (test_bit(WL1271_FLAG_IRQ_RUNNING, &wl->flags))
-		pending = true;
-	else
-		wl->elp_compl = &compl;
+	wl->elp_compl = &compl;
 	spin_unlock_irqrestore(&wl->wl_lock, flags);
 
 	ret = wlcore_raw_write32(wl, HW_ACCESS_ELP_CTRL_REG, ELPCTRL_WAKE_UP);
 	if (ret < 0) {
 		recovery = true;
-		goto err;
-	}
-
-	if (!pending) {
+	} else if (!test_bit(WL1271_FLAG_IRQ_RUNNING, &wl->flags)) {
 		ret = wait_for_completion_timeout(&compl,
 			msecs_to_jiffies(WL1271_WAKEUP_TIMEOUT));
 		if (ret == 0) {
 			wl1271_warning("ELP wakeup timeout!");
-
-			/* Return no error for runtime PM for recovery */
-			ret = 0;
 			recovery = true;
-			goto err;
 		}
 	}
 
-	clear_bit(WL1271_FLAG_IN_ELP, &wl->flags);
-
-	wl1271_debug(DEBUG_PSM, "wakeup time: %u ms",
-		     jiffies_to_msecs(jiffies - start_time));
-
-	return 0;
-
-err:
 	spin_lock_irqsave(&wl->wl_lock, flags);
 	wl->elp_compl = NULL;
 	spin_unlock_irqrestore(&wl->wl_lock, flags);
+	clear_bit(WL1271_FLAG_IN_ELP, &wl->flags);
 
 	if (recovery) {
 		set_bit(WL1271_FLAG_INTENDED_FW_RECOVERY, &wl->flags);
 		wl12xx_queue_recovery_work(wl);
+	} else {
+		wl1271_debug(DEBUG_PSM, "wakeup time: %u ms",
+			     jiffies_to_msecs(jiffies - start_time));
 	}
 
-	return ret;
+	return 0;
 }
 
 static const struct dev_pm_ops wlcore_pm_ops = {