Re: [PATCH v7 3/4] misc: fastrpc: Add support for new DSP IOVA formatting

[Dmitry Baryshkov]

On Fri, Dec 26, 2025 at 12:35:33PM +0530, Kumari Pallavi wrote:
> Implement the new IOVA formatting required by the DSP architecture change
> on Kaanapali SoC. Place the SID for DSP DMA transactions at bit 56 in the
> physical address. This placement is necessary for the DSPs to correctly
> identify streams and operate as intended.
> To address this, set SID position to bit 56 via OF matching on the fastrpc
> node; otherwise, default to legacy 32-bit placement.
> This change ensures consistent SID placement across DSPs.
> 
> Signed-off-by: Kumari Pallavi <kumari.pallavi@xxxxxxxxxxxxxxxx>
> ---
>  drivers/misc/fastrpc.c | 62 ++++++++++++++++++++++++++++++++++--------
>  1 file changed, 51 insertions(+), 11 deletions(-)

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


-- 
With best wishes
Dmitry