drm/amd/display: Prevent overflow on DTO calculation

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[Why]
uint32_t is implicitly converted to uint64_t while multiplication
still happens on uint32_t side.  This creates digit overflow
for large pixel clock which is meant to be retained in uint64_t.

[How]
Calculate multiplication of units in uint64_t domain instead of
uint32_t in DTO parameter clock caculation.

Reviewed-by: Alvin Lee <alvin.lee2@amd.com>
Acked-by: Zaeem Mohamed <zaeem.mohamed@amd.com>
Signed-off-by: Chris Park <chris.park@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

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Chris Park 2024-05-27 21:21:30 -04:00 • committed by Alex Deucher

parent ed79ab5a07

commit 8362061eed

1 changed files with 8 additions and 4 deletions

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drivers/gpu/drm/amd/display/dc/dce/dce_clock_source.c

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