linux-kernel - Re: [PATCH v6 4/4] misc: fastrpc: Update dma

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Message-ID: <e3kkj7fjovs7gd5vqmyrgkojkodmmaqur7tzuq4oq52zb264xs@x6opdbm65k5i>
Date: Thu, 11 Dec 2025 15:38:32 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Kumari Pallavi <kumari.pallavi@....qualcomm.com>
Cc: kpallavi@....qualcomm.com, srini@...nel.org, amahesh@....qualcomm.com,
        arnd@...db.de, gregkh@...uxfoundation.org, robh@...nel.org,
        krzk+dt@...nel.org, conor+dt@...nel.org, quic_bkumar@...cinc.com,
        ekansh.gupta@....qualcomm.com, linux-kernel@...r.kernel.org,
        quic_chennak@...cinc.com, dri-devel@...ts.freedesktop.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        jingyi.wang@....qualcomm.com, aiqun.yu@....qualcomm.com,
        ktadakam@....qualcomm.com
Subject: Re: [PATCH v6 4/4] misc: fastrpc: Update dma_bits for CDSP support
 on Kaanapali SoC

On Thu, Dec 11, 2025 at 03:39:33PM +0530, Kumari Pallavi wrote:
> 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 bits configuration in the driver to support CDSP on
> Kaanapali SoC. Set the default `dma_bits` to 32-bit and update
> it to 34-bit based on CDSP and OF matching on the fastrpc node.
> 
> Signed-off-by: Kumari Pallavi <kumari.pallavi@....qualcomm.com>
> ---
>  drivers/misc/fastrpc.c | 15 +++++++++++++--
>  1 file changed, 13 insertions(+), 2 deletions(-)
> 

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


-- 
With best wishes
Dmitry