drm/amd/display: DML Validation Dump/Check with Logging

[Why]
Need validation that we are programming the expected values (rq, ttu, dlg)
from DML. This debug feature will output logs if we are programming
incorrect values and may help differentiate DAL issues from HW issues.

[How]
Dump relevant registers for each pipe with active stream. Compare current
reg values with the converted DML output. Log mismatches when found.
Signed-off-by: Jaehyun Chung <jaehyun.chung@amd.com>
Reviewed-by: Alvin Lee <Alvin.Lee2@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/core/dc.c

@@ -2162,8 +2162,24 @@ static void commit_planes_for_stream(struct dc *dc,
 					dc, pipe_ctx->stream, stream_status->plane_count, context);
 		}
 	}
-	if (dc->hwss.program_front_end_for_ctx && update_type != UPDATE_TYPE_FAST)
+	if (dc->hwss.program_front_end_for_ctx && update_type != UPDATE_TYPE_FAST) {
 		dc->hwss.program_front_end_for_ctx(dc, context);
+#ifdef CONFIG_DRM_AMD_DC_DCN1_0
+		if (dc->debug.validate_dml_output) {
+			for (i = 0; i < dc->res_pool->pipe_count; i++) {
+				struct pipe_ctx cur_pipe = context->res_ctx.pipe_ctx[i];
+				if (cur_pipe.stream == NULL)
+					continue;
+
+				cur_pipe.plane_res.hubp->funcs->validate_dml_output(
+						cur_pipe.plane_res.hubp, dc->ctx,
+						&context->res_ctx.pipe_ctx[i].rq_regs,
+						&context->res_ctx.pipe_ctx[i].dlg_regs,
+						&context->res_ctx.pipe_ctx[i].ttu_regs);
+			}
+		}
+#endif
+	}
 
 	// Update Type FAST, Surface updates
 	if (update_type == UPDATE_TYPE_FAST) {

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

@@ -412,6 +412,7 @@ struct dc_debug_options {
 
 	bool nv12_iflip_vm_wa;
 	bool disable_dram_clock_change_vactive_support;
+	bool validate_dml_output;
 };
 
 struct dc_debug_data {

drivers/gpu/drm/amd/display/dc/inc/hw/hubp.h

@@ -157,6 +157,13 @@ struct hubp_funcs {
 		struct hubp *hubp,
 		bool enable);
 
+	void (*validate_dml_output)(
+			struct hubp *hubp,
+			struct dc_context *ctx,
+			struct _vcs_dpi_display_rq_regs_st *dml_rq_regs,
+			struct _vcs_dpi_display_dlg_regs_st *dml_dlg_attr,
+			struct _vcs_dpi_display_ttu_regs_st *dml_ttu_attr);
+
 };
 
 #endif