Re: [PATCH AUTOSEL 5.15 10/47] iommu/arm-smmu-v3: Make default domain type of HiSilicon PTT device to identity

[John Garry]

On 13/10/2022 01:20, Sasha Levin wrote:
> From: Yicong Yang<yangyicong@xxxxxxxxxxxxx>
>
> [ Upstream commit 24b6c7798a0122012ca848ea0d25e973334266b0 ]
>
> The DMA operations of HiSilicon PTT device can only work properly with
> identical mappings. So add a quirk for the device to force the domain
> as passthrough.
>
> Acked-by: Will Deacon<will@xxxxxxxxxx>
> Signed-off-by: Yicong Yang<yangyicong@xxxxxxxxxxxxx>
> Reviewed-by: John Garry<john.garry@xxxxxxxxxx>
> Link:https://lore.kernel.org/r/20220816114414.4092-2-yangyicong@xxxxxxxxxx
> Signed-off-by: Mathieu Poirier<mathieu.poirier@xxxxxxxxxx>
> Signed-off-by: Sasha Levin<sashal@xxxxxxxxxx>
> ---
>   drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 21 +++++++++++++++++++++
>   1 file changed, 21 insertions(+)

I don't think that this commit should be backported to any stable tree. 
It's only required for a new driver.

Thanks,
John