drm/amd/display: treat memory as a single-channel for asymmetric memory v2

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Previous change had been reverted since it caused hang.
Remake change to avoid defect.

[Why]
1. Driver use umachannelnumber to calculate watermarks for stutter.
In asymmetric memory config, the actual bandwidth is less than
dual-channel. The bandwidth should be the same as single-channel.
2. We found single rank dimm need additional delay time for stutter.

[How]
Get information from each DIMM. Treat memory config as a single-channel
for asymmetric memory in bandwidth calculating.
Add additional delay time for single rank dimm.

Fixes: b8720ed0b8 ("drm/amd/display: System black screen hangs on driver load")
Signed-off-by: Hugo Hu <hugo.hu@amd.com>
Reviewed-by: Sung Lee <Sung.Lee@amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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Hugo Hu 2021-01-20 15:54:11 +08:00 • committed by Alex Deucher

parent 8a20c97329

commit 9c82354e89

2 changed files with 48 additions and 2 deletions

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48

drivers/gpu/drm/amd/display/dc/clk_mgr/dcn21/rn_clk_mgr.c

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2

drivers/gpu/drm/amd/display/dc/dc.h

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