drm/amdgpu: fix an UMC hw arbitrator bug(v3)

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issue:
the UMC6 h/w bug is that when MCLK is doing the switch
in the middle of a page access being preempted by high
priority client (e.g. DISPLAY) then UMC and the mclk switch
would stuck there due to deadlock

how:
fixed by disabling auto PreChg for UMC to avoid high
priority client preempting other client's access on
the same page, thus the deadlock could be avoided

v2:
put the patch in callback of UMC6
v3:
rename the callback to "init_registers"

Signed-off-by: Monk Liu <Monk.Liu@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Hawking Zhang <hawking.zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

This commit is contained in:

Monk Liu 2019-09-24 16:08:00 +08:00 • committed by Alex Deucher

parent 6de088a08d

commit e7da754b00

5 changed files with 77 additions and 1 deletions

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2

drivers/gpu/drm/amd/amdgpu/Makefile

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1

drivers/gpu/drm/amd/amdgpu/amdgpu_umc.h

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7

drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c

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37

drivers/gpu/drm/amd/amdgpu/umc_v6_0.c

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31

drivers/gpu/drm/amd/amdgpu/umc_v6_0.h

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