[PATCH v2] wifi: ath11k: fix boot failure with one MSI vector

[Kalle Valo]

Jeff Johnson <quic_jjohnson at quicinc.com> writes:

> On 9/6/2023 6:56 PM, Baochen Qiang wrote:
>> Commit 5b32b6dd96633 ("ath11k: Remove core PCI references from
>> PCI common code") breaks with one MSI vector because it moves
>> affinity setting after IRQ request, see below log:
>> [ 1417.278835] ath11k_pci 0000:02:00.0: failed to receive control
>> response completion, polling..
>> [ 1418.302829] ath11k_pci 0000:02:00.0: Service connect timeout
>> [ 1418.302833] ath11k_pci 0000:02:00.0: failed to connect to HTT: -110
>> [ 1418.303669] ath11k_pci 0000:02:00.0: failed to start core: -110
>> The detail is, if do affinity request after IRQ activated,
>> which is done in request_irq(), kernel caches that request and
>> returns success directly. Later when a subsequent MHI interrupt is
>> fired, kernel will do the real affinity setting work, as a result,
>> changs the MSI vector. However at that time host has configured
>> old vector to hardware, so host never receives CE or DP interrupts.
>> Fix it by setting affinity before registering MHI controller
>> where host is, for the first time, doing IRQ request.
>> Tested-on: WCN6855 hw2.0 PCI
>> WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3
>
> Tested-on: WCN6855 hw2.1 PCI
> WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3.6510.23
> Tested-on: WCN6750 hw1.0 AHB WLAN.MSL.1.0.1-01160-QCAMSLSWPLZ-1

I can fix that in the pending branch.

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