mt76: mt7915: add MSI support

Move IRQ processing to a tasklet, similar to MT7615/MT7663
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt7915/init.c

@@ -752,6 +752,7 @@ void mt7915_unregister_device(struct mt7915_dev *dev)
 	mt7915_mcu_exit(dev);
 	mt7915_tx_token_put(dev);
 	mt7915_dma_cleanup(dev);
+	tasklet_disable(&dev->irq_tasklet);
 
 	mt76_free_device(&dev->mt76);
 }

drivers/net/wireless/mediatek/mt76/mt7915/mt7915.h

@@ -169,6 +169,7 @@ struct mt7915_dev {
 	struct mt7915_hif *hif2;
 
 	const struct mt76_bus_ops *bus_ops;
+	struct tasklet_struct irq_tasklet;
 	struct mt7915_phy phy;
 
 	u16 chainmask;
@@ -374,9 +375,11 @@ void mt7915_dual_hif_set_irq_mask(struct mt7915_dev *dev, bool write_reg,
 static inline void mt7915_irq_enable(struct mt7915_dev *dev, u32 mask)
 {
 	if (dev->hif2)
-		mt7915_dual_hif_set_irq_mask(dev, true, 0, mask);
+		mt7915_dual_hif_set_irq_mask(dev, false, 0, mask);
 	else
-		mt76_set_irq_mask(&dev->mt76, MT_INT_MASK_CSR, 0, mask);
+		mt76_set_irq_mask(&dev->mt76, 0, 0, mask);
+
+	tasklet_schedule(&dev->irq_tasklet);
 }
 
 static inline void mt7915_irq_disable(struct mt7915_dev *dev, u32 mask)

drivers/net/wireless/mediatek/mt76/mt7915/pci.c

@@ -94,11 +94,15 @@ mt7915_rx_poll_complete(struct mt76_dev *mdev, enum mt76_rxq_id q)
 }
 
 /* TODO: support 2/4/6/8 MSI-X vectors */
-static irqreturn_t mt7915_irq_handler(int irq, void *dev_instance)
+static void mt7915_irq_tasklet(struct tasklet_struct *t)
 {
-	struct mt7915_dev *dev = dev_instance;
+	struct mt7915_dev *dev = from_tasklet(dev, t, irq_tasklet);
 	u32 intr, intr1, mask;
 
+	mt76_wr(dev, MT_INT_MASK_CSR, 0);
+	if (dev->hif2)
+		mt76_wr(dev, MT_INT1_MASK_CSR, 0);
+
 	intr = mt76_rr(dev, MT_INT_SOURCE_CSR);
 	intr &= dev->mt76.mmio.irqmask;
 	mt76_wr(dev, MT_INT_SOURCE_CSR, intr);
@@ -111,9 +115,6 @@ static irqreturn_t mt7915_irq_handler(int irq, void *dev_instance)
 		intr |= intr1;
 	}
 
-	if (!test_bit(MT76_STATE_INITIALIZED, &dev->mphy.state))
-		return IRQ_NONE;
-
 	trace_dev_irq(&dev->mt76, intr, dev->mt76.mmio.irqmask);
 
 	mask = intr & MT_INT_RX_DONE_ALL;
@@ -150,6 +151,20 @@ static irqreturn_t mt7915_irq_handler(int irq, void *dev_instance)
 			wake_up(&dev->reset_wait);
 		}
 	}
+}
+
+static irqreturn_t mt7915_irq_handler(int irq, void *dev_instance)
+{
+	struct mt7915_dev *dev = dev_instance;
+
+	mt76_wr(dev, MT_INT_MASK_CSR, 0);
+	if (dev->hif2)
+		mt76_wr(dev, MT_INT1_MASK_CSR, 0);
+
+	if (!test_bit(MT76_STATE_INITIALIZED, &dev->mphy.state))
+		return IRQ_NONE;
+
+	tasklet_schedule(&dev->irq_tasklet);
 
 	return IRQ_HANDLED;
 }
@@ -250,10 +265,18 @@ static int mt7915_pci_probe(struct pci_dev *pdev,
 
 	dev = container_of(mdev, struct mt7915_dev, mt76);
 
+	ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_ALL_TYPES);
+	if (ret < 0)
+		goto free;
+
 	ret = mt7915_mmio_init(mdev, pcim_iomap_table(pdev)[0], pdev->irq);
 	if (ret)
 		goto error;
 
+	tasklet_setup(&dev->irq_tasklet, mt7915_irq_tasklet);
+
+	mt76_wr(dev, MT_INT_MASK_CSR, 0);
+
 	/* master switch of PCIe tnterrupt enable */
 	mt76_wr(dev, MT_PCIE_MAC_INT_ENABLE, 0xff);
 
@@ -266,10 +289,14 @@ static int mt7915_pci_probe(struct pci_dev *pdev,
 
 	ret = mt7915_register_device(dev);
 	if (ret)
-		goto error;
+		goto free_irq;
 
 	return 0;
+free_irq:
+	devm_free_irq(mdev->dev, pdev->irq, dev);
 error:
+	pci_free_irq_vectors(pdev);
+free:
 	mt76_free_device(&dev->mt76);
 
 	return ret;