WCN7850 problem on Linux kernel 6.15

Doug Brewer brewer.doug at gmail.com
Wed May 28 17:30:37 PDT 2025 

On Wed, May 28, 2025 at 10:36 PM Baochen Qiang <quic_bqiang at quicinc.com> wrote:
>
>
>
> On 5/28/2025 8:55 PM, Doug Brewer wrote:
> > On Wed, May 28, 2025 at 4:02 PM Baochen Qiang <quic_bqiang at quicinc.com> wrote:
> >>
> >>
> >>
> >> On 5/28/2025 3:29 PM, Doug Brewer wrote:
> >>> 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.
> >>
> >> Please also try latest ath tree if issue still seen with mainline kernel.
> >
> > Both mainline and stable kernels have the same error.
> > Switched to ath.git, my ath12k works.
> >
> > Seems to me that both mainline and stable kernels have fallout.
>
> Great. So seems some fixes/update not landing in mainline/stable yet.

It's not good that ath12k is broken on the stable kernel 6.15.
Do you know which fixes haven't landed yet?
I'd be happy to help test them, 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

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