APPLIED: [SRU][Jammy:linux-intel-iotg][PATCH v3 0/2] i915: Enable HuC authentication for EHL, ICL, and ADL-S

[Philip Cox]

On Tue, 2022-08-16 at 10:20 -0400, Philip Cox wrote:
> BugLink: https://bugs.launchpad.net/bugs/1981971
> 
> v2: removed magic number in patch 0002, and clean up commit message
>        in commit 0001.
> v3: added version history to cover letter, and to patch commit
> messages.
> 
> [Impact]
> * In the i915 Intel gfx driver, we need to explicitly enable HuC
>   authentication.
> 
> * This fixes an issue with the Gstreamer media pipeline.  
> 
> * This only applies to the ICL, ADL-S, and EHL platforms.
> 
> * This patch is only for the linux-intel-iotg kernel.  We have pulled
>    in patches from upstream, so the state of this driver is in
> between
>    the upstream 5.15 driver, and the upstream tip-of-tree driver.
> 
> [Test Plan]
> * Intel has tested this patch.
> 
> * I have tested the patch as well.
> 
> * To test, the system is booted, and issuing the command:
>       sudo cat /sys/kernel/debug/dri/0/gt/uc/huc_info
>   will either return the huc info, or it will display
>   "HuC disabled"
> 
> 
> 
> [Where problems could occur]
> * If the installed firmware has been trimmed so that only blobs
>     that were in use were retained, when the kernel tried to load
>     the HuC blob, it would fail.  This scenario should not happen
>     unless someone is mucking about with the installed firmware.
>     If that is the case, other things will likely start failing
>     as well.
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