mt76: mt7615: introduce PM support

Introduce suspend/resume to mt7615e driver

Co-developed-by: Wan-Feng Jiang <Wan-Feng.Jiang@mediatek.com>
Signed-off-by: Wan-Feng Jiang <Wan-Feng.Jiang@mediatek.com>
Co-developed-by: Soul Huang <Soul.Huang@mediatek.com>
Signed-off-by: Soul Huang <Soul.Huang@mediatek.com>
Co-developed-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

1 files changed, 108 insertions, 0 deletions

diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/pci.c b/drivers/net/wireless/mediatek/mt76/mt7615/pci.c
index 0605c908059e..88ff14564521 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7615/pci.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7615/pci.c
@@ -66,11 +66,119 @@ static void mt7615_pci_remove(struct pci_dev *pdev)
 	pci_free_irq_vectors(pdev);
 }
 
+#ifdef CONFIG_PM
+static int mt7615_pci_suspend(struct pci_dev *pdev, pm_message_t state)
+{
+	struct mt76_dev *mdev = pci_get_drvdata(pdev);
+	struct mt7615_dev *dev = container_of(mdev, struct mt7615_dev, mt76);
+	bool hif_suspend;
+	int i, err;
+
+	hif_suspend = !test_bit(MT76_STATE_SUSPEND, &dev->mphy.state) &&
+		      mt7615_firmware_offload(dev);
+	if (hif_suspend) {
+		err = mt7615_mcu_set_hif_suspend(dev, true);
+		if (err)
+			return err;
+	}
+
+	napi_disable(&mdev->tx_napi);
+	tasklet_kill(&mdev->tx_tasklet);
+
+	for (i = 0; i < ARRAY_SIZE(mdev->q_rx); i++)
+		napi_disable(&mdev->napi[i]);
+	tasklet_kill(&dev->irq_tasklet);
+
+	mt7615_dma_reset(dev);
+
+	err = mt7615_wait_pdma_busy(dev);
+	if (err)
+		goto restore;
+
+	if (is_mt7663(mdev)) {
+		mt76_set(dev, MT_PDMA_SLP_PROT, MT_PDMA_AXI_SLPPROT_ENABLE);
+		if (!mt76_poll_msec(dev, MT_PDMA_SLP_PROT,
+				    MT_PDMA_AXI_SLPPROT_RDY,
+				    MT_PDMA_AXI_SLPPROT_RDY, 1000)) {
+			dev_err(mdev->dev, "PDMA sleep protection failed\n");
+			err = -EIO;
+			goto restore;
+		}
+	}
+
+	pci_enable_wake(pdev, pci_choose_state(pdev, state), true);
+	pci_save_state(pdev);
+	err = pci_set_power_state(pdev, pci_choose_state(pdev, state));
+	if (err)
+		goto restore;
+
+	err = mt7615_firmware_own(dev);
+	if (err)
+		goto restore;
+
+	return 0;
+
+restore:
+	for (i = 0; i < ARRAY_SIZE(mdev->q_rx); i++)
+		napi_enable(&mdev->napi[i]);
+	napi_enable(&mdev->tx_napi);
+	if (hif_suspend)
+		mt7615_mcu_set_hif_suspend(dev, false);
+
+	return err;
+}
+
+static int mt7615_pci_resume(struct pci_dev *pdev)
+{
+	struct mt76_dev *mdev = pci_get_drvdata(pdev);
+	struct mt7615_dev *dev = container_of(mdev, struct mt7615_dev, mt76);
+	bool pdma_reset;
+	int i, err;
+
+	err = mt7615_driver_own(dev);
+	if (err < 0)
+		return err;
+
+	err = pci_set_power_state(pdev, PCI_D0);
+	if (err)
+		return err;
+
+	pci_restore_state(pdev);
+
+	if (is_mt7663(&dev->mt76)) {
+		mt76_clear(dev, MT_PDMA_SLP_PROT, MT_PDMA_AXI_SLPPROT_ENABLE);
+		mt76_wr(dev, MT_PCIE_IRQ_ENABLE, 1);
+	}
+
+	pdma_reset = !mt76_rr(dev, MT_WPDMA_TX_RING0_CTRL0) &&
+		     !mt76_rr(dev, MT_WPDMA_TX_RING0_CTRL1);
+	if (pdma_reset)
+		dev_err(mdev->dev, "PDMA engine must be reinitialized\n");
+
+	for (i = 0; i < ARRAY_SIZE(mdev->q_rx); i++) {
+		napi_enable(&mdev->napi[i]);
+		napi_schedule(&mdev->napi[i]);
+	}
+	napi_enable(&mdev->tx_napi);
+	napi_schedule(&mdev->tx_napi);
+
+	if (!test_bit(MT76_STATE_SUSPEND, &dev->mphy.state) &&
+	    mt7615_firmware_offload(dev))
+		err = mt7615_mcu_set_hif_suspend(dev, false);
+
+	return err;
+}
+#endif /* CONFIG_PM */
+
 struct pci_driver mt7615_pci_driver = {
 	.name		= KBUILD_MODNAME,
 	.id_table	= mt7615_pci_device_table,
 	.probe		= mt7615_pci_probe,
 	.remove		= mt7615_pci_remove,
+#ifdef CONFIG_PM
+	.suspend	= mt7615_pci_suspend,
+	.resume		= mt7615_pci_resume,
+#endif /* CONFIG_PM */
 };
 
 MODULE_DEVICE_TABLE(pci, mt7615_pci_device_table);