mt76: mt7603: improve reliability of tx powersave filtering

Leave more time to abort transmissions (which could happen at low CCK rates)
Only warn if the last filter command is stuck

Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt7603/mac.c

@@ -202,10 +202,11 @@ void mt7603_filter_tx(struct mt7603_dev *dev, int idx, bool abort)
 			FIELD_PREP(MT_DMA_FQCR0_DEST_PORT_ID, port) |
 			FIELD_PREP(MT_DMA_FQCR0_DEST_QUEUE_ID, queue));
 
-		WARN_ON_ONCE(!mt76_poll(dev, MT_DMA_FQCR0, MT_DMA_FQCR0_BUSY,
-					0, 5000));
+		mt76_poll(dev, MT_DMA_FQCR0, MT_DMA_FQCR0_BUSY, 0, 15000);
 	}
 
+	WARN_ON_ONCE(mt76_rr(dev, MT_DMA_FQCR0) & MT_DMA_FQCR0_BUSY);
+
 	mt76_wr(dev, MT_TX_ABORT, 0);
 
 	mt7603_wtbl_set_skip_tx(dev, idx, false);