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| author | Robin Chen <[email protected]> | 2023-12-20 12:31:28 +0000 |
|---|---|---|
| committer | Alex Deucher <[email protected]> | 2024-03-20 17:37:37 +0000 |
| commit | eed4edda910fe34dfae8c6bfbcf57f4593a54295 (patch) | |
| tree | e81678d481ed5777c9939b08f67f993367e57450 /drivers/gpu/drm/amd/amdgpu/amdgpu_mes.c | |
| parent | drm/amd/display: 3.2.274 (diff) | |
| download | kernel-eed4edda910fe34dfae8c6bfbcf57f4593a54295.tar.gz kernel-eed4edda910fe34dfae8c6bfbcf57f4593a54295.zip | |
drm/amd/display: Support long vblank feature
[WHY]
We want to support low hz case, but the original
vtotal/vtotal_min/vtotal_max can't support more
than 0x7FFF.
[HOW]
We use the 2 HW reg to contorl long vblank case.
1. OTG_V_COUNT_STOP_CONTROL -> vcount_stop
2. OTG_V_COUNT_STOP_CONTROL2 -> vcount_stop_timer
vcount_stop define from which line we stop using vcount
and start using vcount2.
vcount_stop_timer define how long we use vcount2.
Ex:
Vtotal = 7
OTG_V_COUNT_STOP_CONTROL = 4
OTG_V_COUNT_STOP_CONTROL2 = 5
time : 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11
vcount : 0, 1, 2, 3, - - - - - 4, 5, 6
vcount2 : 0, 1, 2, 3, 4,
Reviewed-by: Jun Lei <[email protected]>
Acked-by: Alex Hung <[email protected]>
Signed-off-by: ChunTao Tso <[email protected]>
Signed-off-by: Robin Chen<[email protected]>
Tested-by: Daniel Wheeler <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_mes.c')
0 files changed, 0 insertions, 0 deletions