linux-kernel - Re: [PATCH] wifi: ath12k: extend dma mask to 36 bits

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Message-ID: <8edf77d9-1afd-402a-b966-d1b3e5b4ba1b@oss.qualcomm.com>
Date: Wed, 26 Mar 2025 08:11:11 -0700
From: Jeff Johnson <jeff.johnson@....qualcomm.com>
To: Johan Hovold <johan+linaro@...nel.org>, Jeff Johnson <jjohnson@...nel.org>
Cc: Stephan Gerhold <stephan.gerhold@...aro.org>, ath12k@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] wifi: ath12k: extend dma mask to 36 bits

On 3/21/2025 9:23 AM, Johan Hovold wrote:
> Extend the DMA mask to 36 bits to avoid using bounce buffers on machines
> without an iommu (under OS control) similar to what was done for ath11k
> in commit dbd73acb22d8 ("wifi: ath11k: enable 36 bit mask for stream
> DMA").
> 
> This specifically avoids using bounce buffers on Qualcomm Snapdragon X
> Elite machines like the Lenovo ThinkPad T14s when running at EL1.
> 
> Note that the mask could possibly be extended further but unresolved DMA
> issues with 64 GiB X Elite machines currently prevents that from being
> tested.
> 
> Also note that the driver is limited to 32 bits for coherent
> allocations and that there is no need to check for errors when setting
> masks larger than 32 bits.
> 
> Tested-on: WCN7850 hw2.0 WLAN.HMT.1.0.c5-00481-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3
> 
> Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
> ---

Please make sure to include linux-wireless for all ath.git patches so that
they are processed by patchwork.kernel.org

/jeff