drm/amd/display: Guard against setting dispclk low when active

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[ Upstream commit 72d7a7fa1f ]

[Why]
We should never apply a minimum dispclk value while in prepare_bandwidth
or while displays are active. This is always an optimization for when
all displays are disabled.

[How]
Defer dispclk optimization until safe_to_lower = true and display_count
reaches 0.

Since 0 has a special value in this logic (ie. no dispclk required)
we also need adjust the logic that clamps it for the actual request
to PMFW.

Reviewed-by: Gabe Teeger <gabe.teeger@amd.com>
Reviewed-by: Leo Chen <leo.chen@amd.com>
Reviewed-by: Syed Hassan <syed.hassan@amd.com>
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Signed-off-by: Roman Li <roman.li@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

This commit is contained in:

Nicholas Kazlauskas 2025-02-03 09:49:58 -05:00 • committed by Greg Kroah-Hartman

parent b02b561bf7

commit 2bba67f030

1 changed files with 9 additions and 4 deletions

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drivers/gpu/drm/amd/display/dc/clk_mgr/dcn35/dcn35_clk_mgr.c

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