drm/amdgpu: Make display watermark calculations more accurate

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Avoid big roundoff errors in scanline/hactive durations for
high pixel clocks, especially for >= 500 Mhz, and thereby
program more accurate display fifo watermarks.

Implemented here for DCE 6,8,10,11.
Successfully tested on DCE 10 with AMD R9 380 Tonga.

Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Mario Kleiner <mario.kleiner.de@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org

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Mario Kleiner 2017-03-29 22:09:11 +02:00 • committed by Alex Deucher

parent 211eed656b

commit d63c277dc6

4 changed files with 20 additions and 20 deletions

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10

drivers/gpu/drm/amd/amdgpu/dce_v10_0.c

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10

drivers/gpu/drm/amd/amdgpu/dce_v11_0.c

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10

drivers/gpu/drm/amd/amdgpu/dce_v6_0.c

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10

drivers/gpu/drm/amd/amdgpu/dce_v8_0.c

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