Re: [PATCH i-g-t] tests/kms_content_protection: Skip MST outputs in SST-style tests

["Jason-JH Lin (林睿祥)" <Jason-JH.Lin@mediatek.com>]

On Wed, 2026-07-15 at 23:14 +0800, Jason-JH.Lin wrote:
> On Fri, 2026-07-10 at 11:42 +0530, Reddy Guddati, Santhosh wrote:
> > Hi Jason,
> > 
> > On 29-06-2026 07:23, Jason-JH Lin wrote:
> > > MST (Multi-Stream Transport) outputs require topology-wide HDCP
> > > authentication which is handled by dedicated dp-mst-* subtests.
> > > Running SST-style tests on MST outputs can cause issues because:
> > > 
> > > 1. MST HDCP authentication involves the entire topology (hub +
> > > monitors)
> > > 2. Per-connector HDCP state management differs from SST
> > > 3. The dp-mst-lic-type-0/1 subtests are specifically designed to
> > > test
> > >     MST HDCP scenarios
> > > 
> > > Skip MST outputs in get_hdcp_outputs() when running non-MST
> > > subtests
> > > to ensure proper test isolation.
> > 
> 
> Hi Reddy,
> 
> Sorry for the late reply. I don't know why I lost your reply mail.😫️
> 
> > IMHO, I dont think we should skip all MST outputs in
> > the SST-style tests - this removes a lot of coverage. NACK for now
> > 
> > You will see a lot of skips after this any mst setup will not run 
> > individual test on those monitors. We want to test individual
> > displays 
> > even though they are connected in MST.
> > 
> > The tests (legacy, type1, lic, uevent, srm, mei-interface) will
> > skip 
> > even if a single monitor is connected through a MST hub thereby a
> > single 
> > MST display would then get no HDCP coverage at all.
> > 
> > Please let me know your thoughts.
> 
> I think a single monitor is connected through a MST hub make sense.
> But in MTK platform which supports MST, even if one monitor connected
> to a MST hub, it'll got to the MST flow and make the HDCP auth fail.
> 
> But we found a HDCP issue in MST mode recently. We'll confirm if we
> still need this skip patch after we fix the issue and let you know.
> 

Hi Reddy,

After we solved the MST HDCP issue, I confirmed that we can pass SST
test case in MST mode without this patch.

So we can drop this patch now.

Thanks
Jason-JH Lin