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Message-ID: <fa70ca5e-001b-3c6b-dbc2-2853f8fc2f72@quicinc.com>
Date:   Mon, 7 Aug 2023 15:46:51 +0530
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Subject: Re: [PATCH] wifi: ath11k: fix boot failure with one MSI vector
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From:   Manikanta Pubbisetty <quic_mpubbise@quicinc.com>
To:     Baochen Qiang <quic_bqiang@quicinc.com>,
        Kalle Valo <kvalo@kernel.org>
CC:     <ath11k@lists.infradead.org>, <linux-wireless@vger.kernel.org>
References: <20230601033840.2997-1-quic_bqiang@quicinc.com>
 <87fs70hlel.fsf@kernel.org>
 <545cc8e8-481d-85b2-5692-43580936b48d@quicinc.com>
 <897b61ea-36d2-1ab4-9c60-9bdfd2d9cad7@quicinc.com>
In-Reply-To: <897b61ea-36d2-1ab4-9c60-9bdfd2d9cad7@quicinc.com>
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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@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@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@quicinc.com>


Thanks,
Manikanta