drm/amd/display: clamp force_min_dcfclk to dcn42b range

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[Why]
The force_min_dcfclk_mhz debug option can request a DCFCLK
outside the dcn42b hardware limits, which risks driving the
clock below its minimum or above its maximum.

[How]
Add a dcn42b_update_clocks wrapper that clamps
force_min_dcfclk_mhz to [200, 600] MHz (0 leaves it disabled)
before calling the shared dcn42_update_clocks, keeping the
clamp specific to dcn42b, and wire it into the dcn42b clk_mgr
funcs.

Reviewed-by: Ovidiu Bunea <ovidiu.bunea@amd.com>
Signed-off-by: Gabe Teeger <gabe.teeger@amd.com>
Signed-off-by: Tom Chung <chiahsuan.chung@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

This commit is contained in:

Gabe Teeger 2026-07-27 10:53:57 -04:00 • committed by Alex Deucher

parent 02be6d6827

commit 50eed169c0

1 changed files with 27 additions and 3 deletions

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drivers/gpu/drm/amd/display/dc/clk_mgr/dcn42b/dcn42b_clk_mgr.c

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