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drm/amd/display: implement workaround for riommu related hang

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[Why]
During S4/S5/reboot, sometimes riommu invalidation request arrive too
early, DCN may be unable to respond to the invalidation request
resulting in pstate hang.

[How]
VBIOS will force allow pstate for riommu invalidation and driver will
clear it after powering down display pipes.

Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Eric Yang <Eric.Yang2@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Eric Yang
2021-06-23 15:48:02 -04:00
committed by Alex Deucher
parent ec3102dc6b
commit 32f1d0cfc3
6 changed files with 27 additions and 2 deletions
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18
drivers/gpu/drm/amd/display/dc/dcn31/dcn31_hwseq.c
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@@ -47,6 +47,7 @@
#include "dce/dmub_outbox.h"
#include "dc_link_dp.h"
#include "inc/link_dpcd.h"
#include "dcn10/dcn10_hw_sequencer.h"
#define DC_LOGGER_INIT(logger)
@@ -594,3 +595,20 @@ bool dcn31_is_abm_supported(struct dc *dc,
}
return false;
}
static void apply_riommu_invalidation_wa(struct dc *dc)
{
struct dce_hwseq *hws = dc->hwseq;
if (!hws->wa.early_riommu_invalidation)
return;
REG_UPDATE(DCHUBBUB_ARB_HOSTVM_CNTL, DISABLE_HOSTVM_FORCE_ALLOW_PSTATE, 0);
}
void dcn31_init_pipes(struct dc *dc, struct dc_state *context)
{
dcn10_init_pipes(dc, context);
apply_riommu_invalidation_wa(dc);
}