drm/amd/display: Add writeback_config to VBA vars

Adding writeback_config enum to vba_vars_st, replacing old flag.
Initialize to dm_normal.
Signed-off-by: Ilya Bakoulin <Ilya.Bakoulin@amd.com>
Reviewed-by: Charlene Liu <Charlene.Liu@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -152,6 +152,7 @@ struct _vcs_dpi_ip_params_st {
 	unsigned int writeback_line_buffer_luma_buffer_size;
 	unsigned int writeback_line_buffer_chroma_buffer_size;
 #endif
+
 	unsigned int max_page_table_levels;
 	unsigned int max_num_dpp;
 	unsigned int max_num_otg;

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

@@ -306,7 +306,6 @@ static void fetch_ip_params(struct display_mode_lib *mode_lib)
 
 	mode_lib->vba.WritebackInterfaceBufferSize = ip->writeback_interface_buffer_size_kbytes;
 	mode_lib->vba.WritebackLineBufferSize = ip->writeback_line_buffer_buffer_size;
-	mode_lib->vba.WritebackSupportInterleaveAndUsingWholeBufferForASingleStream = false;
 	mode_lib->vba.MinVoltageLevel = 0;
 	mode_lib->vba.MaxVoltageLevel = 5;
 
@@ -323,6 +322,7 @@ static void fetch_ip_params(struct display_mode_lib *mode_lib)
 	mode_lib->vba.WritebackMinVSCLRatio = ip->writeback_min_vscl_ratio;
 	mode_lib->vba.WritebackMaxHSCLTaps = ip->writeback_max_hscl_taps;
 	mode_lib->vba.WritebackMaxVSCLTaps = ip->writeback_max_vscl_taps;
+	mode_lib->vba.WritebackConfiguration = dm_normal;
 	mode_lib->vba.GPUVMMaxPageTableLevels = ip->gpuvm_max_page_table_levels;
 	mode_lib->vba.HostVMMaxNonCachedPageTableLevels = ip->hostvm_max_page_table_levels;
 	mode_lib->vba.HostVMMaxPageTableLevels = ip->hostvm_max_page_table_levels;

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

@@ -237,6 +237,7 @@ struct vba_vars_st {
 	unsigned int WritebackInterfaceLumaBufferSize;
 	unsigned int WritebackInterfaceChromaBufferSize;
 	unsigned int WritebackChromaLineBufferWidth;
+	enum writeback_config WritebackConfiguration;
 	double MaxDCHUBToPSCLThroughput;
 	double MaxPSCLToLBThroughput;
 	unsigned int PTEBufferSizeInRequestsLuma;