wifi: mt76: mt7925: disable ASPM and runtime PM for MT7927

Disable PCIe ASPM unconditionally for MT7927. The CONNINFRA power
domain and WFDMA register access are unreliable with PCIe L1 active,
causing throughput to drop from 1+ Gbps to ~200 Mbps.

Disable runtime PM and deep sleep for MT7927. The combo chip shares
a CONNINFRA power domain between WiFi (PCIe) and BT (USB).
SET_OWN/CLR_OWN transitions on the LPCTL register crash the BT
firmware, requiring a full power cycle to recover. PM enablement will
be addressed in a follow-up once safe power state transitions are
determined.

Reviewed-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Javier Tia <floss@jetm.me>
Link: https://patch.msgid.link/20260425195011.790265-10-sean.wang@kernel.org
Signed-off-by: Felix Fietkau <nbd@nbd.name>

diff --git a/drivers/net/wireless/mediatek/mt76/mt7925/init.c b/drivers/net/wireless/mediatek/mt76/mt7925/init.c
index c0c5cb9aff75a4707e14aa35f7c9f1bfc067ce48..a8c2ca7c0efc62e81dc58a4897d27dda49643843 100644 (file)
--- a/drivers/net/wireless/mediatek/mt76/mt7925/init.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7925/init.c
@@ -232,7 +232,8 @@ int mt7925_register_device(struct mt792x_dev *dev)
        dev->pm.idle_timeout = MT792x_PM_TIMEOUT;
        dev->pm.stats.last_wake_event = jiffies;
        dev->pm.stats.last_doze_event = jiffies;
-       if (!mt76_is_usb(&dev->mt76)) {
+       /* MT7927: runtime PM crashes BT firmware on the shared CONNINFRA domain */
+       if (!mt76_is_usb(&dev->mt76) && !is_mt7927(&dev->mt76)) {
                dev->pm.enable_user = true;
                dev->pm.enable = true;
                dev->pm.ds_enable_user = true;

diff --git a/drivers/net/wireless/mediatek/mt76/mt7925/pci.c b/drivers/net/wireless/mediatek/mt76/mt7925/pci.c
index 7e0d0e247fa3e029cefad022b52a9f81971fdd35..3e2afa0dac7413a3bbb9dc995d6777b833b7fe07 100644 (file)
--- a/drivers/net/wireless/mediatek/mt76/mt7925/pci.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7925/pci.c
@@ -350,7 +350,10 @@ static int mt7925_pci_probe(struct pci_dev *pdev,
        if (ret)
                goto err_free_pci_vec;
 
-       if (mt7925_disable_aspm)
+       is_mt7927_hw = (pdev->device == 0x6639 || pdev->device == 0x7927);
+
+       /* MT7927: ASPM L1 causes unreliable WFDMA register access */
+       if (mt7925_disable_aspm || is_mt7927_hw)
                mt76_pci_disable_aspm(pdev);
 
        ops = mt792x_get_mac80211_ops(&pdev->dev, &mt7925_ops,
@@ -371,7 +374,6 @@ static int mt7925_pci_probe(struct pci_dev *pdev,
        dev = container_of(mdev, struct mt792x_dev, mt76);
        dev->fw_features = features;
        dev->hif_ops = &mt7925_pcie_ops;
-       is_mt7927_hw = (pdev->device == 0x6639 || pdev->device == 0x7927);
        dev->irq_map = is_mt7927_hw ? &mt7927_irq_map : &irq_map;
        mt76_mmio_init(&dev->mt76, pcim_iomap_table(pdev)[0]);
        tasklet_init(&mdev->irq_tasklet, mt792x_irq_tasklet, (unsigned long)dev);