Hi, Javier

Sorry for the late reply. This version already looks better than v1
overall, and the patch order is cleaner. I still think a few areas
could be refined further, as this would also be a good opportunity to
refactor the code a bit so mt7927 support fits more naturally and
future chips are easier to handle as well.

On Wed, Mar 25, 2026 at 5:11 PM Javier Tia [off-list ref] wrote:

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 X870-I (WiFi 14c3:7927)
- ASUS ROG Strix X870-F Gaming WiFi (BT 0489:e13a, WiFi 14c3:7927)
- ASUS ROG Strix X870E-E (BT 13d3:3588, 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)
- Gigabyte Z790 AORUS ELITE X WiFi7 (BT 0489:e10f, WiFi 14c3:7927)
- MSI MEG X870E ACE MAX (BT 0489:e110, WiFi 14c3:7927)
- Lenovo Legion Pro 7 16ARX9 (BT 0489:e0fa, WiFi 14c3:7927)
- Lenovo Legion Pro 7 16AFR10H (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
- System suspend/resume (S3)
- DBDC (dual-band concurrent) mode
- Explicit band_idx assignment for stable 5GHz/6GHz operation
- ASPM and runtime PM disabled for MT7927 (see below)

Known limitations (planned as follow-up series):
- Runtime PM: disabled for MT7927 because 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 once safe power state transitions are determined.
- 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/ (local)

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.

This part patch 1-8 looks good overall. My only concern was a possible
regression on mt7925, but now that the incorrect mt7925 320 MHz
support has been fixed  in the version, this should be fine.

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.

I am still thinking a bit more about patches 9-11. My current
preference is to introduce the generic layer first, and then migrate
the mt7925 and mt7927-specific parts on top of it.
I will handle this part on my side, since I want to carefully compare
the vendor driver with your changes first, and make sure the mt7925
side is solid before moving the mt7927-related changes forward. For
the mt7927-related work, I will make sure your contribution, as well
as the work from the other volunteers, is properly preserved when I
carry this forward.

Patch 12 disables ASPM and runtime PM for MT7927.
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.

Similar to the BT side, I would prefer to have a dedicated Linux
firmware for mt7927 WiFi. I am not sure yet whether the current
changes will work seamlessly with that, so we can revisit it later and
see what further adjustments are needed.

Changes since v2 (suggested by Sean Wang):
- Fixed is_320mhz_supported() to check for MT7927 only, not the
  entire mt7925 family. MT7925 does not support 320MHz (patch 5).
- Dropped phy_cap_info[7] 320MHz additions (NON_OFDMA_UL_MU_MIMO
  and MU_BEAMFORMER) to keep capabilities conservative (patch 5).
- Disabled runtime PM for MT7927 (patch 12). The combo chip shares a
  CONNINFRA power domain between WiFi and BT; SET_OWN/CLR_OWN
  transitions crash BT firmware. Discovered via user reports of BT
  lockups after enabling power_save=1 (Reported-by: Nitin Gurram).
- Added tested hardware: MSI MEG X870E ACE MAX, Gigabyte Z790 AORUS
  ELITE X WiFi7, Lenovo Legion Pro 7 16AFR10H.

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 v2: https://lore.kernel.org/linux-wireless/20260319-mt7927-wifi-support-v2-v2-0-d627a7fad70d@jetm.me/ (local)
Link to v1: https://lore.kernel.org/linux-wireless/20260306-mt7927-wifi-support-v1-0-c77e7445511d@jetm.me/ (local)

Assisted-by: Claude (Anthropic)
Signed-off-by: Javier Tia <redacted>
---
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: disable ASPM and runtime PM 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   |  19 +-
 drivers/net/wireless/mediatek/mt76/mt7925/mac.c    |   9 +
 drivers/net/wireless/mediatek/mt76/mt7925/main.c   |  61 ++++-
 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, 528 insertions(+), 75 deletions(-)
---
base-commit: 9ac76f3d0bb2940db3a9684d596b9c8f301ef315
change-id: 20260319-mt7927-wifi-support-v2-e89d779b28f4

Best regards,
--
Javier Tia [off-list ref]