linux-kernel - Re: [PATCH 2/2] misc: fastrpc: Update dma_mask for CDSP support on Kaanapali SoC

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Message-ID: <pxffubrq3362deajql2ajheoq53wvgrlx7ttxqlwg5n6zsxzib@zk3lwqwiq5zb>
Date: Thu, 25 Sep 2025 05:57:59 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Jingyi Wang <jingyi.wang@....qualcomm.com>
Cc: Srinivas Kandagatla <srini@...nel.org>,
        Amol Maheshwari <amahesh@....qualcomm.com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        aiqun.yu@....qualcomm.com, tingwei.zhang@....qualcomm.com,
        trilok.soni@....qualcomm.com, yijie.yang@....qualcomm.com,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org,
        Kumari Pallavi <kumari.pallavi@....qualcomm.com>
Subject: Re: [PATCH 2/2] misc: fastrpc: Update dma_mask for CDSP support on
 Kaanapali SoC

On Wed, Sep 24, 2025 at 04:46:37PM -0700, Jingyi Wang wrote:
> From: Kumari Pallavi <kumari.pallavi@....qualcomm.com>
> 
> DSP currently supports 32-bit IOVA (32-bit PA + 4-bit SID) for
> both Q6 and user DMA (uDMA) access. This is being upgraded to
> 34-bit PA + 4-bit SID due to a hardware revision in CDSP for
> Kaanapali SoC, which expands the DMA addressable range.
> Update DMA mask configuration in the driver to support CDSP on
> Kaanapali SoC. Set the default `dma_mask` to 32-bit and update
> it to 34-bit based on CDSP and SoC-specific compatible string.
> 
> Signed-off-by: Kumari Pallavi <kumari.pallavi@....qualcomm.com>
> Signed-off-by: Jingyi Wang <jingyi.wang@....qualcomm.com>
> ---
>  drivers/misc/fastrpc.c | 14 ++++++++++----
>  1 file changed, 10 insertions(+), 4 deletions(-)
> 

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>


-- 
With best wishes
Dmitry