[PATCH v2 00/13] wifi: mt76: mt7925: add MT7927 (Filogic 380) support

[Javier Tia <floss@jetm.me>]

This series adds support for the MediaTek MT7927 (Filogic 380) combo
WiFi 7 + BT 5.4 module to the mt7925 driver. The MT7927 uses PCI ID
14c3:7927 (some hardware reports 14c3:6639) and shares the mt7925
firmware interface but requires different DMA ring layout, IRQ mapping,
chip initialization, and power management handling.

Tested hardware:
- ASUS ROG Crosshair X870E Hero (BT 0489:e13a, WiFi 14c3:6639)
- ASUS ProArt X870E-Creator WiFi (BT 0489:e13a / 13d3:3588, WiFi 14c3:6639)
- ASUS ROG Strix X870E-E (BT 0489:e13a, WiFi 14c3:7927)
- Gigabyte X870E Aorus Master X3D (BT 0489:e10f, WiFi 14c3:7927)
- Gigabyte Z790 AORUS MASTER X (BT 0489:e10f, WiFi 14c3:7927)
- Lenovo Legion Pro 7 16ARX9 (BT 0489:e0fa, WiFi 14c3:7927)
- TP-Link Archer TBE550E PCIe (BT 0489:e116, WiFi 14c3:7927)
- EDUP EP-MT7927BE M.2 card (WiFi 14c3:7927)
- Foxconn/Azurewave M.2 modules (WiFi 14c3:6639)
- AMD RZ738 reference design (WiFi 14c3:0738)

Tested on Arch Linux, CachyOS, EndeavourOS, Fedora (Bazzite), NixOS,
openSUSE Tumbleweed, and Ubuntu across kernels 6.13-6.19.

What works:
- WiFi 7 with EHT 320MHz on 2.4/5/6 GHz bands
- 320MHz data path verified at 841 Mbps (iperf3 -t30 -P8)
- PCIe initialization with CBTOP remap and MT7927-specific DMA layout
- Runtime power management and suspend/resume (S3)
- DBDC (dual-band concurrent) mode
- Explicit band_idx assignment for stable 5GHz/6GHz operation
- ASPM disabled for MT7927 to prevent throughput collapse

Known limitations (planned as follow-up series):
- mac_reset returns -EOPNOTSUPP (DMA recovery not yet implemented)
- MLO (Multi-Link Operation): tested working on 5GHz+2.4GHz STR
  (776 Mbps) but requires additional patches for link lifetime
  and error handling. Sean Wang's series [1] addresses these;
  MLO support will be submitted as a follow-up on top of that.
- TX retransmissions: elevated retry rate on all bands, firmware-side
  rate adaptation issue not addressable in the driver.

[1] https://lore.kernel.org/linux-wireless/20260306232238.2039675-1-sean.wang@kernel.org/

Patches 1-5 add generic 320MHz EHT support (no MT7927 references).
Patches 6-7 introduce MT7927 chip ID helpers and firmware paths.
Patch 8 adds per-chip IRQ map handling.
Patch 9 introduces mt792x_dma_config struct for chip-specific DMA.
Patch 10 combines CBTOP remap, chip init, DBDC, CNM, and mac_reset.
Patch 11 adds mt7925_band_idx() helper for stable 5/6 GHz operation.
Patch 12 enables runtime PM and disables ASPM.
Patch 13 enables the MT7927 PCI device table entries.

The WiFi firmware path and filename in linux-firmware have not been
finalized yet. The driver currently requests mediatek/mt6639/ (the
mobile SoC codename), but this may change based on the linux-firmware
review.

Changes since v1 (suggested by Sean Wang):
- Reorganized from 18 patches into 13 across 8 logical groups
- Common 320MHz patches first, chip-specific changes later
- Introduced mt792x_dma_config struct to reuse mt7925_dma_init()
  instead of duplicating as mt7927_dma_init()
- Replaced is_mt7927() with is_320mhz_supported() in common patches
- Added mt7925_band_idx() helper replacing scattered if/else patterns
- Renamed MT7927-specific registers with MT7927_ prefix
- Added PCI ID 0x0738 for AMD RZ738 hardware
- Moved GLO_CFG_EXT1 register address into dma_config struct to
  eliminate is_mt7927() from shared mt792x_dma.c

Link to v1: https://lore.kernel.org/linux-wireless/20260306-mt7927-wifi-support-v1-0-c77e7445511d@jetm.me/

Assisted-by: Claude (Anthropic)
Signed-off-by: Javier Tia <floss@jetm.me>
---
Javier Tia (13):
      wifi: mt76: mt7925: fix stale pointer comparisons in change_vif_links
      wifi: mt76: mt7925: add 320MHz bandwidth to bss_rlm_tlv
      wifi: mt76: mt7925: handle 320MHz bandwidth in RXV and TXS
      wifi: mt76: mt7925: populate EHT 320MHz MCS map in sta_rec
      wifi: mt76: mt7925: advertise EHT 320MHz capabilities for 6GHz band
      wifi: mt76: mt7925: add MT7927 chip ID helpers
      wifi: mt76: mt7925: add MT7927 firmware paths
      wifi: mt76: mt7925: use irq_map for chip-specific interrupt handling
      wifi: mt76: mt7925: add chip-specific DMA configuration
      wifi: mt76: mt7925: add MT7927 hardware initialization
      wifi: mt76: mt7925: fix band_idx for stable 5GHz/6GHz operation
      wifi: mt76: mt7925: enable low power support for MT7927
      wifi: mt76: mt7925: enable MT7927 PCI device IDs

 drivers/net/wireless/mediatek/mt76/mt76_connac.h   |  13 +-
 drivers/net/wireless/mediatek/mt76/mt7925/init.c   |  13 +
 drivers/net/wireless/mediatek/mt76/mt7925/mac.c    |   9 +
 drivers/net/wireless/mediatek/mt76/mt7925/main.c   |  67 ++++-
 drivers/net/wireless/mediatek/mt76/mt7925/mcu.c    |  55 +++-
 drivers/net/wireless/mediatek/mt76/mt7925/mt7925.h |   7 +
 drivers/net/wireless/mediatek/mt76/mt7925/pci.c    | 277 +++++++++++++++++++--
 .../net/wireless/mediatek/mt76/mt7925/pci_mac.c    |  14 +-
 .../net/wireless/mediatek/mt76/mt7925/pci_mcu.c    |  20 +-
 drivers/net/wireless/mediatek/mt76/mt792x.h        |  27 ++
 drivers/net/wireless/mediatek/mt76/mt792x_dma.c    |  68 ++---
 drivers/net/wireless/mediatek/mt76/mt792x_regs.h   |  33 +++
 12 files changed, 529 insertions(+), 74 deletions(-)
---
base-commit: 9ac76f3d0bb2940db3a9684d596b9c8f301ef315
change-id: 20260319-mt7927-wifi-support-v2-e89d779b28f4

Best regards,
-- 
Javier Tia <floss@jetm.me>