WCN7850 problem on Linux kernel 6.15

Doug Brewer brewer.doug at gmail.com
Thu May 29 00:24:52 PDT 2025 

On Thu, May 29, 2025 at 1:34 PM Baochen Qiang <quic_bqiang at quicinc.com> wrote:
>
>
>
> On 5/29/2025 1:27 PM, Baochen Qiang wrote:
> >
> >
> > On 5/29/2025 8:30 AM, Doug Brewer wrote:
> >> 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.
> >
> > Pease pick below series and try
> >
> > https://lore.kernel.org/linux-wireless/20250409-ath12k-wcn7850-mlo-support-v2-0-3801132ca2c3@quicinc.com/
>
> forget to mention that there would be conflicts when applying but they are trivial so
> guess you can handle it.
>
> Anyway please let me know if any help you need.

Indeed, there are three files with conflicts: dp_rx.c, hw.c, and hw.h,
but I can handle them.

This patch is against the stable kernel 6.15:
https://0x0.st/s/yfQHTDVDbzo7M5b6dHswjg/83Xm.15

Anyway, after applying this patch, ath12k works properly.

# dmesg | grep ath12k
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
ath12k_pci 0000:03:00.0: AER: can't recover (no error_detected callback)
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_V2.0_SILICONZ-3

Hope 6.15.1 will fix this issue.  Thanks.

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