drm/amd/display: Avoid NULL hubp deref for remaining mpcc_id assignment

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Previous fix converted most mpcc_id assignments in dc_hw_sequencer.c
from pipe_ctx->plane_res.hubp->inst to plane_res.mpcc_inst, but missed
the update_visual_confirm and power_on_mpc_mem_pwr paths in
hwss_build_fast_sequence(). On DCE ASICs the pipe owns no HUBP, so those
two remaining hubp->inst reads can NULL-deref.

Use mpcc_inst for the remaining two assignments, matching the rest of
the function and avoiding the NULL pointer dereference (same issue
addressed upstream by "avoid NULL hubp deref when filling mpcc_id on
DCE").

Fixes: 8e4670efd6 ("drm/amd/display: Use mpcc_id instead of hubp instance")
Reviewed-by: Tomasz Siemek <tomasz.siemek@amd.com>
Signed-off-by: James Lin <PingLei.Lin@amd.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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James Lin 2026-08-18 10:41:57 +08:00 • committed by Alex Deucher

parent 5c1b464239

commit 3beb029bb2

1 changed files with 2 additions and 2 deletions

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drivers/gpu/drm/amd/display/dc/core/dc_hw_sequencer.c

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