From: Michael Strauss <michael.strauss@xxxxxxx> [WHY] This workaround resolves underflow caused by incorrect DST_Y_PREFETCH. Overriding to 192KB DET buf size until the DST_Y_PREFETCH calc is fixed. Reviewed-by: Eric Yang <Eric.Yang2@xxxxxxx> Acked-by: Pavle Kotarac <Pavle.Kotarac@xxxxxxx> Signed-off-by: Michael Strauss <michael.strauss@xxxxxxx> --- drivers/gpu/drm/amd/display/dc/dcn31/dcn31_resource.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/gpu/drm/amd/display/dc/dcn31/dcn31_resource.c b/drivers/gpu/drm/amd/display/dc/dcn31/dcn31_resource.c index 04b52c9d18da..a99800146c9d 100644 --- a/drivers/gpu/drm/amd/display/dc/dcn31/dcn31_resource.c +++ b/drivers/gpu/drm/amd/display/dc/dcn31/dcn31_resource.c @@ -1770,6 +1770,7 @@ static int dcn31_populate_dml_pipes_from_context( int i, pipe_cnt; struct resource_context *res_ctx = &context->res_ctx; struct pipe_ctx *pipe; + bool upscaled = false; dcn20_populate_dml_pipes_from_context(dc, context, pipes, fast_validate); @@ -1781,6 +1782,11 @@ static int dcn31_populate_dml_pipes_from_context( pipe = &res_ctx->pipe_ctx[i]; timing = &pipe->stream->timing; + if (pipe->plane_state && + (pipe->plane_state->src_rect.height < pipe->plane_state->dst_rect.height || + pipe->plane_state->src_rect.width < pipe->plane_state->dst_rect.width)) + upscaled = true; + /* * Immediate flip can be set dynamically after enabling the plane. * We need to require support for immediate flip or underflow can be @@ -1828,6 +1834,8 @@ static int dcn31_populate_dml_pipes_from_context( } else if (context->stream_count >= dc->debug.crb_alloc_policy_min_disp_count && dc->debug.crb_alloc_policy > DET_SIZE_DEFAULT) { context->bw_ctx.dml.ip.det_buffer_size_kbytes = dc->debug.crb_alloc_policy * 64; + } else if (context->stream_count >= 3 && upscaled) { + context->bw_ctx.dml.ip.det_buffer_size_kbytes = 192; } return pipe_cnt; -- 2.32.0