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

[You-Sheng Yang]

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(-)

-- 
2.37.2