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

[Baochen Qiang]

On 8/7/2023 6:16 PM, Manikanta Pubbisetty wrote:
> On 8/7/2023 12:53 PM, Manikanta Pubbisetty wrote:
>> On 8/7/2023 12:44 PM, Baochen Qiang wrote:
>>>
>>> On 6/9/2023 8:26 PM, Kalle Valo wrote:
>>>> Baochen Qiang <quic_bqiang at quicinc.com> writes:
>>>>
>>>>> 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
>>>>>
>>>>> Fixes: 5b32b6dd9663 ("ath11k: Remove core PCI references from PCI 
>>>>> common code")
>>>>> Signed-off-by: Baochen Qiang <quic_bqiang at quicinc.com>
>>>> I'm worried if this breaks WCN6750 support. Manikanta, would able to
>>>> test this patch on WCN6750 and let us know if breaks anything?
>>> Hi Manikanta, could you help test this patch on WCN6750?
>>
>> Sure, we will test and update this here.
>>
>
> No impact on WCN6750.
>
> Tested-by: Manikanta Pubbisetty <quic_mpubbise at quicinc.com>
>
>
> Thanks,
> Manikanta

Thanks Mani.

Hi Kalle, any more comments?