drm/amd/display: Fix frames_to_insert math

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[Why]
The math on deciding on how many
"frames to insert" sometimes sent us over the max refresh rate.
Also integer overflow can occur if we have high refresh rates.

[How]
Instead of clipping the  frame duration such that it doesn’t go below the min,
just remove a frame from the number of frames to insert. +
Use unsigned long long for intermediate calculations to prevent
integer overflow.

Signed-off-by: Bayan Zabihiyan <bayan.zabihiyan@amd.com>
Reviewed-by: Aric Cyr <Aric.Cyr@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

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Bayan Zabihiyan 2019-07-10 16:00:53 -04:00 • committed by Alex Deucher

parent 1cbcfc9751

commit a463b26303

1 changed files with 17 additions and 10 deletions

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drivers/gpu/drm/amd/display/modules/freesync/freesync.c

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