staging: wfx: always enable FastPs in combo with new firmwares

When multiple interface on different channels are in use. It is
necessary to advertise the AP that the device is no more awake before to
switch to the other channel.

Until now, PS-Poll was the preferred mechanism for that. However.  The
new firmwares (>= 3.7) now nicely support FastPS.

FastPS improves bandwidth and compatibility with AP.

This patch drop the complex and rarely used mechanism introduced in the
commit dd5eba1b ("staging: wfx: fix support for AP that do not
support PS-Poll") and use FastPS as soon as it is possible.
Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20200701150707.222985-14-Jerome.Pouiller@silabs.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wfx/hif_rx.c

@@ -149,7 +149,6 @@ static int hif_event_indication(struct wfx_dev *wdev,
 	struct wfx_vif *wvif = wdev_to_wvif(wdev, hif->interface);
 	const struct hif_ind_event *body = buf;
 	int type = le32_to_cpu(body->event_id);
-	int cause;
 
 	if (!wvif) {
 		dev_warn(wdev->dev, "received event for non-existent vif\n");
@@ -168,13 +167,8 @@ static int hif_event_indication(struct wfx_dev *wdev,
 		dev_dbg(wdev->dev, "ignore BSSREGAINED indication\n");
 		break;
 	case HIF_EVENT_IND_PS_MODE_ERROR:
-		cause = le32_to_cpu(body->event_data.ps_mode_error);
 		dev_warn(wdev->dev, "error while processing power save request: %d\n",
-			 cause);
-		if (cause == HIF_PS_ERROR_AP_NOT_RESP_TO_POLL) {
-			wvif->bss_not_support_ps_poll = true;
-			schedule_work(&wvif->update_pm_work);
-		}
+			 le32_to_cpu(body->event_data.ps_mode_error));
 		break;
 	default:
 		dev_warn(wdev->dev, "unhandled event indication: %.2x\n",

drivers/staging/wfx/sta.c

@@ -219,10 +219,10 @@ static int wfx_get_ps_timeout(struct wfx_vif *wvif, bool *enable_ps)
 			*enable_ps = true;
 		if (wvif->wdev->force_ps_timeout > -1)
 			return wvif->wdev->force_ps_timeout;
-		else if (wvif->bss_not_support_ps_poll)
-			return 30;
-		else
+		else if (wfx_api_older_than(wvif->wdev, 3, 2))
 			return 0;
+		else
+			return 30;
 	}
 	if (enable_ps)
 		*enable_ps = wvif->vif->bss_conf.ps;
@@ -255,14 +255,6 @@ int wfx_update_pm(struct wfx_vif *wvif)
 	return hif_set_pm(wvif, ps, ps_timeout);
 }
 
-static void wfx_update_pm_work(struct work_struct *work)
-{
-	struct wfx_vif *wvif = container_of(work, struct wfx_vif,
-					    update_pm_work);
-
-	wfx_update_pm(wvif);
-}
-
 int wfx_conf_tx(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
 		   u16 queue, const struct ieee80211_tx_queue_params *params)
 {
@@ -372,7 +364,6 @@ void wfx_reset(struct wfx_vif *wvif)
 		hif_set_block_ack_policy(wvif, 0xFF, 0xFF);
 	wfx_tx_unlock(wdev);
 	wvif->join_in_progress = false;
-	wvif->bss_not_support_ps_poll = false;
 	cancel_delayed_work_sync(&wvif->beacon_loss_work);
 	wvif =  NULL;
 	while ((wvif = wvif_iterate(wdev, wvif)) != NULL)
@@ -790,7 +781,6 @@ int wfx_add_interface(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
 
 	init_completion(&wvif->set_pm_mode_complete);
 	complete(&wvif->set_pm_mode_complete);
-	INIT_WORK(&wvif->update_pm_work, wfx_update_pm_work);
 	INIT_WORK(&wvif->tx_policy_upload_work, wfx_tx_policy_upload_work);
 
 	mutex_init(&wvif->scan_lock);

drivers/staging/wfx/wfx.h

@@ -93,8 +93,6 @@ struct wfx_vif {
 	bool			scan_abort;
 	struct ieee80211_scan_request *scan_req;
 
-	bool			bss_not_support_ps_poll;
-	struct work_struct	update_pm_work;
 	struct completion	set_pm_mode_complete;
 };