WCN7850 problem on Linux kernel 6.15

[Doug Brewer]

On Wed, May 28, 2025 at 1:16 PM Baochen Qiang <quic_bqiang at quicinc.com> wrote:
>
>
>
> On 5/27/2025 11:00 AM, Doug Brewer wrote:
> > On Tue, May 27, 2025 at 9:10 AM Doug Brewer wrote:
> >>
> >> Hello,
> >>
> >> After upgrading to kernel 6.15, my ath12k failed to start:ath12k_pci
>
> Is this mainline kernel or stable kernel?

It's stable kernel:
https://cdn.kernel.org/pub/linux/kernel/v6.x/linux-6.15.tar.xz

> >> 0000:03:00.0: BAR 0 [mem 0xdf000000-0xdf1fffff 64bit]: assigned
> >> ath12k_pci 0000:03:00.0: enabling device (0000 -> 0002)
> >> ath12k_pci 0000:03:00.0: MSI vectors: 16
> >> ath12k_pci 0000:03:00.0: Hardware name: wcn7850 hw2.0
> >> NET: Registered PF_QIPCRTR protocol family
> >> pcieport 0000:00:1d.0: AER: Multiple Uncorrectable (Non-Fatal) error message rec
> >> eived from 0000:00:1d.0
> >> pcieport 0000:00:1d.0: PCIe Bus Error: severity=Uncorrectable (Non-Fatal), type=
> >> Transaction Layer, (Completer ID)
> >> pcieport 0000:00:1d.0:   device [8086:9d18] error status/mask=00008000/00010000
> >> pcieport 0000:00:1d.0:    [15] CmpltAbrt              (First)
> >> pcieport 0000:00:1d.0: AER:   TLP Header: 0x00000000 0x00000000 0x00000000 0x000
> >> 00000
>
> Strange there is AER error? Is 0000:00:1d.0 upstream port of WLAN target? I guess not
> because 8086:9d18 seems like an Intel device?

Appending ‘pcie_aspm=off’ to the kernel command line will eliminate that error.

> Can you share lspci log:
>
> lspci -tv

-[0000:00]-+-00.0  Intel Corporation Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Pro
cessor Host Bridge/DRAM Registers
          +-02.0  Intel Corporation Skylake GT2 [HD Graphics 520]
          +-08.0  Intel Corporation Xeon E3-1200 v5/v6 / E3-1500 v5 / 6th/7th/8
th Gen Core Processor Gaussian Mixture Model
          +-14.0  Intel Corporation Sunrise Point-LP USB 3.0 xHCI Controller
          +-16.0  Intel Corporation Sunrise Point-LP CSME HECI #1
          +-17.0  Intel Corporation Sunrise Point-LP SATA Controller [AHCI mode]
          +-1c.0-[01]--
          +-1c.5-[02]----00.0  Intel Corporation I210 Gigabit Network Connection
          +-1d.0-[03]----00.0  Qualcomm Technologies, Inc WCN785x Wi-Fi 7(802.1
1be) 320MHz 2x2 [FastConnect 7800]
          +-1e.0  Intel Corporation Sunrise Point-LP Serial IO UART Controller
#0
          +-1e.6  Intel Corporation Sunrise Point-LP Secure Digital IO
Controller
          +-1f.0  Intel Corporation Sunrise Point-LP LPC Controller
          +-1f.2  Intel Corporation Sunrise Point-LP PMC
          +-1f.3  Intel Corporation Sunrise Point-LP HD Audio
          +-1f.4  Intel Corporation Sunrise Point-LP SMBus
          \-1f.6  Intel Corporation Ethernet Connection I219-LM


> >> mhi mhi0: Requested to power ON
> >> mhi mhi0: Power on setup success
> >> mhi mhi0: Wait for device to enter SBL or Mission mode
> >> ath12k_pci 0000:03:00.0: AER: can't recover (no error_detected callback)
> >> pcieport 0000:00:1d.0: AER: device recovery failed
> >> ath12k_pci 0000:03:00.0: qmi dma allocation failed (7012352 B type 1),
> >> will try later with small size
> >> ath12k_pci 0000:03:00.0: chip_id 0x2 chip_family 0x4 board_id 0xff
> >> soc_id 0x40170200
> >> ath12k_pci 0000:03:00.0: fw_version 0x1108811c fw_build_timestamp 2025-05-17 00:
> >> 21 fw_build_id QC_IMAGE_VERSION_STRING=WLAN.HMT.1.1.c5-00284.1-QCAHMTSWPL_V1.0_V
> >> 2.0_SILICONZ-3
> >> ath12k_pci 0000:03:00.0: ignore reset dev flags 0x200
> >> ath12k_pci 0000:03:00.0: failed to receive wmi unified ready event: -110
> >> ath12k_pci 0000:03:00.0: failed to start core: -110
> >> failed to send QMI message
> >> ath12k_pci 0000:03:00.0: qmi failed to send mode request, mode: 4, err = -5
> >> ath12k_pci 0000:03:00.0: qmi failed to send wlan mode off
> >
> > Tested on same machine with kernel 6.14.8, ath12k works:
>
> This seem like stable kernel, can you try latest mainline kernel?
>
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/
>
> or latest ath tree?
>
> https://web.git.kernel.org/pub/scm/linux/kernel/git/ath/ath.git/

OK, will try mailine kernel, thanks.
>
>
> >
> > ath12k_pci 0000:03:00.0: BAR 0 [mem 0xdf000000-0xdf1fffff 64bit]: assigned
> > ath12k_pci 0000:03:00.0: enabling device (0000 -> 0002)
> > ath12k_pci 0000:03:00.0: MSI vectors: 16
> > ath12k_pci 0000:03:00.0: Hardware name: wcn7850 hw2.0
> > pcieport 0000:00:1d.0: AER: Multiple Uncorrectable (Non-Fatal) error message rec
> > eived from 0000:00:1d.0
> > pcieport 0000:00:1d.0: PCIe Bus Error: severity=Uncorrectable (Non-Fatal), type=
> > Transaction Layer, (Completer ID)
> > pcieport 0000:00:1d.0:   device [8086:9d18] error status/mask=00008000/00010000
> > pcieport 0000:00:1d.0:    [15] CmpltAbrt              (First)
> > pcieport 0000:00:1d.0: AER:   TLP Header: 0x00000000 0x00000000
> > 0x00000000 0x00000000
> > mhi mhi0: Requested to power ON
> > mhi mhi0: Power on setup success
> > mhi mhi0: Wait for device to enter SBL or Mission mode
> > ath12k_pci 0000:03:00.0: AER: can't recover (no error_detected callback)
> > pcieport 0000:00:1d.0: AER: device recovery failed
> > ath12k_pci 0000:03:00.0: qmi dma allocation failed (7012352 B type 1),
> > will try later with small size
> > ath12k_pci 0000:03:00.0: chip_id 0x2 chip_family 0x4 board_id 0xff
> > soc_id 0x40170200
> > ath12k_pci 0000:03:00.0: fw_version 0x1108811c fw_build_timestamp 2025-05-17 00:
> > 21 fw_build_id QC_IMAGE_VERSION_STRING=WLAN.HMT.1.1.c5-00284.1-QCAHMTSWPL_V1.0_V
> > 2.0_SILICONZ-3
> >
>