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Subject: Re: [PATCH v2] wifi: ath11k: fix boot failure with one MSI vector
From:   Kalle Valo <kvalo@kernel.org>
In-Reply-To: <20230907015606.16297-1-quic_bqiang@quicinc.com>
References: <20230907015606.16297-1-quic_bqiang@quicinc.com>
To:     Baochen Qiang <quic_bqiang@quicinc.com>
Cc:     <ath11k@lists.infradead.org>, <linux-wireless@vger.kernel.org>
User-Agent: pwcli/0.1.1-git (https://github.com/kvalo/pwcli/) Python/3.11.2
Message-ID: <169528393922.1539628.7842522127045869453.kvalo@kernel.org>
Date:   Thu, 21 Sep 2023 08:12:20 +0000 (UTC)
Precedence: bulk

Baochen Qiang <quic_bqiang@quicinc.com> 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
> 
> Fixes: 5b32b6dd9663 ("ath11k: Remove core PCI references from PCI common code")
> Signed-off-by: Baochen Qiang <quic_bqiang@quicinc.com>
> Acked-by: Jeff Johnson <quic_jjohnson@quicinc.com>
> Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>

Patch applied to ath-next branch of ath.git, thanks.

39564b475ac5 wifi: ath11k: fix boot failure with one MSI vector

-- 
https://patchwork.kernel.org/project/linux-wireless/patch/20230907015606.16297-1-quic_bqiang@quicinc.com/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches