APPLIED [OEM-6.0] Re: [PATCH 0/1][SRU][OEM-6.0/Unstable] use IOMMU passthrough mode for Intel IPUs on Intel Raptor Lake platforms

[Timo Aaltonen]

You-Sheng Yang kirjoitti 13.9.2022 klo 20.50:
> From: "You-Sheng Yang (vicamo)" <vicamo.yang at canonical.com>
> 
> BugLink: https://bugs.launchpad.net/bugs/1989041
> 
> [Impact]
> 
> Intel iommu was turned on by default in mainline build v5.15.5 or jammy
> -generic kernel 5.15.0-12.12. This would breaks IPU6.
> 
> For TGL and ADL platforms, it has been fixed in bug 1958004 for oem-5.14 and
> above. This patch adds a new ID for RPL.
> 
> [Fix]
> 
> Use IOMMU passthrough mode for IPU6 as it has its own iommu hardware.
> 
> [Test Case]
> 
> Apply the fix and kernel should print a new info line:
> 
>    Passthrough IOMMU for integrated Intel IPU
> 
> and IPU6 camera should continue to work without intel_iommu=off
> work-around.
> 
> [Where problems could occur]
> 
> No. That's what it should have been done.
> 
> [Other Info]
> 
> Nominates only oem-6.0 and unstable for we have RPL IPU6 enabled on oem-6.0
> and newer.
> 
> zouxiaoh (1):
>    UBUNTU: SAUCE: iommu: intel-ipu: use IOMMU passthrough mode for Intel
>      IPUs on Raptor Lake
> 
>   drivers/iommu/intel/iommu.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
> 

applied to oem-6.0

but as khfeng said, this should go in mainline


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