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Subject: Re: [PATCH] wifi:ath10k: Set tx credit to one for WCN3990 snoc based
 devices
From:   Kalle Valo <kvalo@kernel.org>
In-Reply-To: <20220801134941.15216-1-quic_youghand@quicinc.com>
References: <20220801134941.15216-1-quic_youghand@quicinc.com>
To:     Youghandhar Chintala <quic_youghand@quicinc.com>
Cc:     <ath10k@lists.infradead.org>, <linux-wireless@vger.kernel.org>,
        Youghandhar Chintala <quic_youghand@quicinc.com>
User-Agent: pwcli/0.1.1-git (https://github.com/kvalo/pwcli/) Python/3.7.3
Message-ID: <166002574373.17823.14670540192835891455.kvalo@kernel.org>
Date:   Tue,  9 Aug 2022 06:15:47 +0000 (UTC)
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Youghandhar Chintala <quic_youghand@quicinc.com> wrote:

> Currently host can send two WMI commands at once. There is possibility to
> cause SMMU issues or corruption, if host wants to initiate 2 DMA
> transfers, it is possible when copy complete interrupt for first DMA
> reaches host, CE has already updated SRRI (Source ring read index) for
> both DMA transfers and is in the middle of 2nd DMA. Host uses SRRI
> (Source ring read index) to interpret how many DMA’s have been completed
> and tries to unmap/free both the DMA entries. Hence now it is limiting to
> one.Because CE is  still in the middle of 2nd DMA which can cause these
> issues when handling two DMA transfers.
> 
> This change will not impact other targets, as it is only for WCN3990.
> 
> Tested-on: WCN3990 hw1.0 SNOC WLAN.HL.2.0-01387-QCAHLSWMTPLZ-1
> 
> Signed-off-by: Youghandhar Chintala <quic_youghand@quicinc.com>
> Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>

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

d81bbb684c25 wifi: ath10k: Set tx credit to one for WCN3990 snoc based devices

-- 
https://patchwork.kernel.org/project/linux-wireless/patch/20220801134941.15216-1-quic_youghand@quicinc.com/

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