drm/amd/display: fix dcn315 dml detile overestimation

DML does not take the fact that dcn315 does not have enough detile
buffer to max all pipes. This change adds a workaround to apply
the same logic DC does when calculating detile buffer size in DML.
Reviewed-by: Charlene Liu <Charlene.Liu@amd.com>
Acked-by: Hamza Mahfooz <hamza.mahfooz@amd.com>
Signed-off-by: Dmytro Laktyushkin <Dmytro.Laktyushkin@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dml/dcn31/dcn31_fpu.c

@@ -739,7 +739,7 @@ void dcn315_update_bw_bounding_box(struct dc *dc, struct clk_bw_params *bw_param
 	}
 
 	if (!IS_FPGA_MAXIMUS_DC(dc->ctx->dce_environment))
-		dml_init_instance(&dc->dml, &dcn3_15_soc, &dcn3_15_ip, DML_PROJECT_DCN31);
+		dml_init_instance(&dc->dml, &dcn3_15_soc, &dcn3_15_ip, DML_PROJECT_DCN315);
 	else
 		dml_init_instance(&dc->dml, &dcn3_15_soc, &dcn3_15_ip, DML_PROJECT_DCN31_FPGA);
 }

drivers/gpu/drm/amd/display/dc/dml/dcn31/display_mode_vba_31.c

@@ -43,6 +43,8 @@
 #define BPP_BLENDED_PIPE 0xffffffff
 #define DCN31_MAX_DSC_IMAGE_WIDTH 5184
 #define DCN31_MAX_FMT_420_BUFFER_WIDTH 4096
+#define DCN3_15_MIN_COMPBUF_SIZE_KB 128
+#define DCN3_15_MAX_DET_SIZE 384
 
 // For DML-C changes that hasn't been propagated to VBA yet
 //#define __DML_VBA_ALLOW_DELTA__
@@ -3775,6 +3777,17 @@ static noinline void CalculatePrefetchSchedulePerPlane(
 		&v->VReadyOffsetPix[k]);
 }
 
+static void PatchDETBufferSizeInKByte(unsigned int NumberOfActivePlanes, int NoOfDPPThisState[], unsigned int config_return_buffer_size_in_kbytes, unsigned int *DETBufferSizeInKByte)
+{
+	int i, total_pipes = 0;
+	for (i = 0; i < NumberOfActivePlanes; i++)
+		total_pipes += NoOfDPPThisState[i];
+	*DETBufferSizeInKByte = ((config_return_buffer_size_in_kbytes - DCN3_15_MIN_COMPBUF_SIZE_KB) / 64 / total_pipes) * 64;
+	if (*DETBufferSizeInKByte > DCN3_15_MAX_DET_SIZE)
+		*DETBufferSizeInKByte = DCN3_15_MAX_DET_SIZE;
+}
+
+
 void dml31_ModeSupportAndSystemConfigurationFull(struct display_mode_lib *mode_lib)
 {
 	struct vba_vars_st *v = &mode_lib->vba;
@@ -4533,6 +4546,8 @@ void dml31_ModeSupportAndSystemConfigurationFull(struct display_mode_lib *mode_l
 				v->ODMCombineEnableThisState[k] = v->ODMCombineEnablePerState[i][k];
 			}
 
+			if (v->NumberOfActivePlanes > 1 && mode_lib->project == DML_PROJECT_DCN315)
+				PatchDETBufferSizeInKByte(v->NumberOfActivePlanes, v->NoOfDPPThisState, v->ip.config_return_buffer_size_in_kbytes, &v->DETBufferSizeInKByte[0]);
 			CalculateSwathAndDETConfiguration(
 					false,
 					v->NumberOfActivePlanes,

drivers/gpu/drm/amd/display/dc/dml/display_mode_lib.c

@@ -114,6 +114,7 @@ void dml_init_instance(struct display_mode_lib *lib,
 		break;
 	case DML_PROJECT_DCN31:
 	case DML_PROJECT_DCN31_FPGA:
+	case DML_PROJECT_DCN315:
 		lib->funcs = dml31_funcs;
 		break;
 	case DML_PROJECT_DCN314:

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

@@ -40,6 +40,7 @@ enum dml_project {
 	DML_PROJECT_DCN21,
 	DML_PROJECT_DCN30,
 	DML_PROJECT_DCN31,
+	DML_PROJECT_DCN315,
 	DML_PROJECT_DCN31_FPGA,
 	DML_PROJECT_DCN314,
 	DML_PROJECT_DCN32,