[PATCH] wifi:ath10k: Set tx credit to one for WCN3990 snoc based devices

Kalle Valo kvalo at kernel.org
Mon Aug 8 23:15:47 PDT 2022

Youghandhar Chintala <quic_youghand at 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 at quicinc.com>
> Signed-off-by: Kalle Valo <quic_kvalo at 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



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