drm/amd/display: Add opt-out for DCN6 OutstandingRequests mode-support check

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The OutstandingRequestsSupport check fails a mode when the
outstanding-request
buffer window (max_outstanding_reqs * request_size / (DCFCLK *
return_bus_width))
is shorter than the average urgent request latency. Because DCFCLK is
derived
from the SOP's bandwidth, a higher-bandwidth SOP raises DCFCLK, shrinks
that
window, and perversely makes the mode unsupported - so "too much bandwidth"
becomes a failure reason, which defies common sense.

When the ROB size / request limit is not yet fixed, the
SOP bandwidth/latency values are tuned to a family maximum and the check
mis-fires. Add a per-display-config override
outstanding_requests_check_disable
(overrides.hw, matching the existing *_check_disable idiom) that early-outs
the
dcn6 check with both flags left supported. Default off, so existing
behavior is
unchanged. Also wire the flag through the DML JSON translation.

Reviewed-by: Dillon Varone <dillon.varone@amd.com>
Signed-off-by: Jun Lei <Jun.Lei@amd.com>
Signed-off-by: James Lin <pinglei.lin@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

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Jun Lei 2026-07-24 16:18:55 -04:00 • committed by Alex Deucher

parent 8e4670efd6

commit 622c6b5af0

2 changed files with 8 additions and 0 deletions

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1

drivers/gpu/drm/amd/display/dc/dml2_0/dml21/inc/dml_top_display_cfg_types.h

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7

drivers/gpu/drm/amd/display/dc/dml2_0/dml21/src/dml2_core/dml2_core_dcn6_funcs_mode_support.c

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