drm/dp_mst: Fix fractional DSC bpp handling

[ Upstream commit 7707dd6022593f3edd8e182e7935870cf326f874 ]

The current code does '(bpp << 4) / 16' in the MST PBN
calculation, but that is just the sam

drm/dp_mst: Fix fractional DSC bpp handling

[ Upstream commit 7707dd6022593f3edd8e182e7935870cf326f874 ]

The current code does '(bpp << 4) / 16' in the MST PBN
calculation, but that is just the same as 'bpp' so the
DSC codepath achieves absolutely nothing. Fix it up so that
the fractional part of the bpp value is actually used instead
of truncated away. 64*1006 has enough zero lsbs that we can
just shift that down in the dividend and thus still manage
to stick to a 32bit divisor.

And while touching this, let's just make the whole thing more
straightforward by making the passed in bpp value .4 binary
fixed point always, instead of having to pass in different
things based on whether DSC is enabled or not.

v2:
- Fix DSC kunit test cases.

Cc: Manasi Navare <manasi.d.navare@intel.com>
Cc: Lyude Paul <lyude@redhat.com>
Cc: Harry Wentland <harry.wentland@amd.com>
Cc: David Francis <David.Francis@amd.com>
Cc: Mikita Lipski <mikita.lipski@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Fixes: dc48529fb14e ("drm/dp_mst: Add PBN calculation for DSC modes")
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
[Imre: Fix kunit test cases]
Acked-by: Maxime Ripard <mripard@kernel.org>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231030155843.2251023-3-imre.deak@intel.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

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drm/tests: Fix kunit_release_action ctx argument

The kunit_action_platform_driver_unregister is added with
&fake_platform_driver as ctx, but the kunit_release_action is called
pdev as ctx. Fix that

drm/tests: Fix kunit_release_action ctx argument

The kunit_action_platform_driver_unregister is added with
&fake_platform_driver as ctx, but the kunit_release_action is called
pdev as ctx. Fix that by replacing it with &fake_platform_driver.

Fixes: 4f2b0b583baa ("drm/tests: helpers: Switch to kunit actions")
Signed-off-by: Arthur Grillo <arthurgrillo@riseup.net>
Reviewed-by: Maíra Canal <mairacanal@riseup.net>
Acked-by: Maxime Ripard <mripard@kernel.org>
Signed-off-by: Maíra Canal <mairacanal@riseup.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20230920-kunit-kasan-fixes-v1-1-1a0fc261832d@riseup.net

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drm/tests: Fix incorrect argument in drm_test_mm_insert_range

While drm_mm test was converted form igt selftest to kunit, unexpected
value of "end" argument equal "start" was introduced to one of ca

drm/tests: Fix incorrect argument in drm_test_mm_insert_range

While drm_mm test was converted form igt selftest to kunit, unexpected
value of "end" argument equal "start" was introduced to one of calls to a
function that executes the drm_test_mm_insert_range for specific start/end
pair of arguments. As a consequence, DRM_MM_BUG_ON(end <= start) is
triggered. Fix it by restoring the original value.

Fixes: fc8d29e298cf ("drm: selftest: convert drm_mm selftest to KUnit")
Signed-off-by: Janusz Krzysztofik <janusz.krzysztofik@linux.intel.com>
Cc: "Maíra Canal" <mairacanal@riseup.net>
Cc: Arthur Grillo <arthurgrillo@riseup.net>
Cc: Javier Martinez Canillas <javierm@redhat.com>
Cc: Daniel Latypov <dlatypov@google.com>
Cc: stable@vger.kernel.org # v6.1+
Reviewed-by: Maíra Canal <mairacanal@riseup.net>
Signed-off-by: Maíra Canal <mairacanal@riseup.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20230911130323.7037-2-janusz.krzysztofik@linux.intel.com

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