linux-stable.git/drivers/gpu/drm/i915/display/tests, branch master Linux kernel stable tree drm/i915/dp: Remove UHBR dependency from SST fallback kunit test 2026-07-20T12:47:10+00:00 Imre Deak imre.deak@intel.com 2026-07-14T15:26:58+00:00 0f0950ca8eb20053022ce956cc3cd112279dd7bb After fallback between UHBR and non-UHBR link rates got enabled in a previous change, there is no need to test fallback sequences for UHBR and non-UHBR rates separately. Make the test simply start from the maximum (UHBR) rate. Reviewed-by: Suraj Kandpal <suraj.kandpal@intel.com> Signed-off-by: Imre Deak <imre.deak@intel.com> Link: https://patch.msgid.link/20260714152700.555527-5-imre.deak@intel.com 
After fallback between UHBR and non-UHBR link rates got enabled in a
previous change, there is no need to test fallback sequences for UHBR
and non-UHBR rates separately. Make the test simply start from the
maximum (UHBR) rate.

Reviewed-by: Suraj Kandpal <suraj.kandpal@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patch.msgid.link/20260714152700.555527-5-imre.deak@intel.com
drm/i915/dp: Enable SST fallback between UHBR and non-UHBR rates 2026-07-20T12:46:58+00:00 Imre Deak imre.deak@intel.com 2026-07-14T15:26:57+00:00 b03e0f8651ca8d041cb2602be8bb701b5af83dbe Enable link training fallback between UHBR and non-UHBR link rates on DP SST links. This was disabled so far to preserve the fallback behavior. There isn't a known issue related to such a fallback and DP MST has been using this for a while already. Also, enabling UHBR rates over Thunderbolt tunnels in a follow-up change, which at least on some links supports only 4 lanes and not 1 or 2 lanes on UHBR, makes a UHBR->non-UHBR fallback scenario more likely. At the same time align the corresponding link training fallback kunit test, allowing a UHBR <-> non-UHBR fallback there as well. Reviewed-by: Suraj Kandpal <suraj.kandpal@intel.comd> Signed-off-by: Imre Deak <imre.deak@intel.com> Link: https://patch.msgid.link/20260714152700.555527-4-imre.deak@intel.com 
Enable link training fallback between UHBR and non-UHBR link rates on DP
SST links. This was disabled so far to preserve the fallback behavior.
There isn't a known issue related to such a fallback and DP MST has been
using this for a while already. Also, enabling UHBR rates over
Thunderbolt tunnels in a follow-up change, which at least on some links
supports only 4 lanes and not 1 or 2 lanes on UHBR, makes a
UHBR->non-UHBR fallback scenario more likely.

At the same time align the corresponding link training fallback kunit
test, allowing a UHBR <-> non-UHBR fallback there as well.

Reviewed-by: Suraj Kandpal <suraj.kandpal@intel.comd>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patch.msgid.link/20260714152700.555527-4-imre.deak@intel.com
drm/i915/kunit: DP link: add fallback tests 2026-07-09T07:38:03+00:00 Imre Deak imre.deak@intel.com 2026-07-01T15:32:03+00:00 4fee95d4f88752c3facbc41f4d0994a074780744 Add KUnit tests for DP link fallback selection across eDP, SST, and MST. Verify that the fallback logic properly selects the maximum allowed configuration, iterates through allowed configurations, and disables failed configs as expected. These tests include UHBR vs. non-UHBR conditions, MST vs. SST mode, and validate that subsequent fallback selections respect the updated allowed configuration mask. v2: - Rebase on changes using a filter object instead of a mask of configuration indices. - Rebase on changes using an iteration object. Reviewed-by: Michał Grzelak <michal.grzelak@intel.com> Signed-off-by: Imre Deak <imre.deak@intel.com> Link: https://patch.msgid.link/20260701153204.4124150-35-imre.deak@intel.com 
Add KUnit tests for DP link fallback selection across eDP, SST, and MST.
Verify that the fallback logic properly selects the maximum allowed
configuration, iterates through allowed configurations, and disables
failed configs as expected.

These tests include UHBR vs. non-UHBR conditions, MST vs. SST mode,
and validate that subsequent fallback selections respect the updated
allowed configuration mask.

v2:
- Rebase on changes using a filter object instead of a mask of
  configuration indices.
- Rebase on changes using an iteration object.

Reviewed-by: Michał Grzelak <michal.grzelak@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patch.msgid.link/20260701153204.4124150-35-imre.deak@intel.com
drm/i915/kunit: DP link: add update config tests 2026-07-09T07:38:03+00:00 Imre Deak imre.deak@intel.com 2026-07-07T12:48:49+00:00 3d0e60d75172265d5e4dff9b148e4adf5fd561c9 Add KUnit tests for link_caps updates shrinking or expanding the supported rates and lane counts. The tests also cover updates with disabled configurations, including random shrink and expand sequences, to verify that disabled state, allowed configurations, ordering, and max limits stay consistent across updates. v2: Remove test cases for the now unused merge update mode. v3: - Test config iteration in lane count, rate order as well. - Keep space after comma in code comment. (Michał) Reviewed-by: Michał Grzelak <michal.grzelak@intel.com> # v2 Signed-off-by: Imre Deak <imre.deak@intel.com> Link: https://patch.msgid.link/20260707124849.135319-4-imre.deak@intel.com 
Add KUnit tests for link_caps updates shrinking or expanding the
supported rates and lane counts.

The tests also cover updates with disabled configurations, including
random shrink and expand sequences, to verify that disabled state,
allowed configurations, ordering, and max limits stay consistent across
updates.

v2: Remove test cases for the now unused merge update mode.
v3:
- Test config iteration in lane count, rate order as well.
- Keep space after comma in code comment. (Michał)

Reviewed-by: Michał Grzelak <michal.grzelak@intel.com> # v2
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patch.msgid.link/20260707124849.135319-4-imre.deak@intel.com
drm/i915/kunit: DP link: add baseline fixed table reference test 2026-07-09T07:38:03+00:00 Imre Deak imre.deak@intel.com 2026-07-07T12:48:48+00:00 ee4c8f2e2a9ac8871a14c9a17e93d6647d5ff2c8 Add a simple baseline test for DP link caps iteration using a fixed standard DP configuration table. This provides a minimal validity check, independent of more complex test setups, verifying the iterator returns expected configurations in ascending and descending order. v2: Unchanged. v3: Test config iteration in lane count, rate order as well. Reviewed-by: Michał Grzelak <michal.grzelak@intel.com> # v2 Signed-off-by: Imre Deak <imre.deak@intel.com> Link: https://patch.msgid.link/20260707124849.135319-3-imre.deak@intel.com 
Add a simple baseline test for DP link caps iteration using a fixed
standard DP configuration table. This provides a minimal validity check,
independent of more complex test setups, verifying the iterator returns
expected configurations in ascending and descending order.

v2: Unchanged.
v3: Test config iteration in lane count, rate order as well.

Reviewed-by: Michał Grzelak <michal.grzelak@intel.com> # v2
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patch.msgid.link/20260707124849.135319-3-imre.deak@intel.com
drm/i915/kunit: Export link training and caps funcs for testing 2026-07-09T07:38:03+00:00 Imre Deak imre.deak@intel.com 2026-07-01T15:32:00+00:00 2eb9982ff179e648675b6c5b345b9ed509fc3361 Export the link caps and link training helpers needed by the DP link KUnit tests. Use test ops tables instead of exporting the helpers directly, avoiding symbol name collisions between the i915 and xe builds of the shared display code. Reviewed-by: Michał Grzelak <michal.grzelak@intel.com> Signed-off-by: Imre Deak <imre.deak@intel.com> Link: https://patch.msgid.link/20260701153204.4124150-32-imre.deak@intel.com 
Export the link caps and link training helpers needed by the DP link
KUnit tests.

Use test ops tables instead of exporting the helpers directly, avoiding
symbol name collisions between the i915 and xe builds of the shared
display code.

Reviewed-by: Michał Grzelak <michal.grzelak@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patch.msgid.link/20260701153204.4124150-32-imre.deak@intel.com
drm/i915/kunit: Setup DP link test context 2026-07-09T07:38:03+00:00 Imre Deak imre.deak@intel.com 2026-07-01T15:31:59+00:00 df152476d00a46bbc28f5adf046e80ee9ad60c2a Initialize a reusable test context for DP link KUnit tests. Sets up minimal device, connector, encoder, and DP structures, and seeds the pseudo-random generator for deterministic test runs. Reviewed-by: Michał Grzelak <michal.grzelak@intel.com> Signed-off-by: Imre Deak <imre.deak@intel.com> Link: https://patch.msgid.link/20260701153204.4124150-31-imre.deak@intel.com 
Initialize a reusable test context for DP link KUnit tests. Sets up
minimal device, connector, encoder, and DP structures, and seeds the
pseudo-random generator for deterministic test runs.

Reviewed-by: Michał Grzelak <michal.grzelak@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patch.msgid.link/20260701153204.4124150-31-imre.deak@intel.com
drm/i915/kunit: Add DP link test stub 2026-07-09T07:38:03+00:00 Imre Deak imre.deak@intel.com 2026-07-01T15:31:56+00:00 d3340e92be326c1d100f68ba7fd840a499b27b93 Add a Kunit stub test module for DP link test cases. v2: Add missing module license. Reviewed-by: Michał Grzelak <michal.grzelak@intel.com> Signed-off-by: Imre Deak <imre.deak@intel.com> Link: https://patch.msgid.link/20260701153204.4124150-28-imre.deak@intel.com 
Add a Kunit stub test module for DP link test cases.

v2: Add missing module license.

Reviewed-by: Michał Grzelak <michal.grzelak@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patch.msgid.link/20260701153204.4124150-28-imre.deak@intel.com