From: Gabe Teeger <gabe.teeger@xxxxxxx> [ Upstream commit 97fa4dfa66fdd52ad3d0c9fadeaaa1e87605bac7 ] [Why] There is underflow and flickering occuring. The underflow stops when hostvm is forced to active. According to policy, hostvm should be enabled if riommu is active, but this is not taken into account when deciding whether to enable hostvm. [What] For DCN314, set hostvm to true if riommu is active. Reviewed-by: Nicholas Kazlauskas <Nicholas.Kazlauskas@xxxxxxx> Acked-by: Qingqing Zhuo <qingqing.zhuo@xxxxxxx> Signed-off-by: Gabe Teeger <gabe.teeger@xxxxxxx> Tested-by: Daniel Wheeler <daniel.wheeler@xxxxxxx> Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- drivers/gpu/drm/amd/display/dc/dml/dcn314/dcn314_fpu.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/gpu/drm/amd/display/dc/dml/dcn314/dcn314_fpu.c b/drivers/gpu/drm/amd/display/dc/dml/dcn314/dcn314_fpu.c index 4f91e64754239..bf77e56c3f3ef 100644 --- a/drivers/gpu/drm/amd/display/dc/dml/dcn314/dcn314_fpu.c +++ b/drivers/gpu/drm/amd/display/dc/dml/dcn314/dcn314_fpu.c @@ -310,6 +310,10 @@ int dcn314_populate_dml_pipes_from_context_fpu(struct dc *dc, struct dc_state *c pipe->plane_state->src_rect.width < pipe->plane_state->dst_rect.width)) upscaled = true; + /* Apply HostVM policy - either based on hypervisor globally enabled, or rIOMMU active */ + if (dc->debug.dml_hostvm_override == DML_HOSTVM_NO_OVERRIDE) + pipes[i].pipe.src.hostvm = dc->vm_pa_config.is_hvm_enabled || dc->res_pool->hubbub->riommu_active; + /* * Immediate flip can be set dynamically after enabling the plane. * We need to require support for immediate flip or underflow can be -- 2.39.2
