drm/amd/display: update DML1 logic for unbounded req handling

[why]
Unbounded request logic in resource/DML has some issues where
unbounded request is being enabled incorrectly.  SW today enables
unbounded request unconditionally in hardware, on the assumption
that HW can always support it in single pipe scenarios.

This worked until now because the same assumption is made in DML.
A new DML update is needed to fix a bug, where there are single
pipe scenarios where unbounded cannot be enabled, and this change
in DML needs to be ported in, and dcn32 resource logic fixed.

[how]
First, dcn32_resource should program unbounded req in HW according
to unbounded req enablement output from DML, as opposed to DML input

Second, port in DML1 update which disables unbounded req in some
scenarios to fix an issue with poor stutter performance

Reviewed-by: Nevenko Stupar <Nevenko.Stupar@amd.com>
Reviewed-by: Dmytro Laktyushkin <Dmytro.Laktyushkin@amd.com>
Acked-by: Solomon Chiu <solomon.chiu@amd.com>
Signed-off-by: Jun Lei <jun.lei@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

2 files changed, 18 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/display/dc/dml/display_mode_vba.c b/drivers/gpu/drm/amd/display/dc/dml/display_mode_vba.c
index bead15d7a767..39f93072b5e0 100644
--- a/drivers/gpu/drm/amd/display/dc/dml/display_mode_vba.c
+++ b/drivers/gpu/drm/amd/display/dc/dml/display_mode_vba.c
@@ -110,6 +110,7 @@ dml_get_attr_func(return_bw, mode_lib->vba.ReturnBW);
 dml_get_attr_func(tcalc, mode_lib->vba.TCalc);
 dml_get_attr_func(fraction_of_urgent_bandwidth, mode_lib->vba.FractionOfUrgentBandwidth);
 dml_get_attr_func(fraction_of_urgent_bandwidth_imm_flip, mode_lib->vba.FractionOfUrgentBandwidthImmediateFlip);
+
 dml_get_attr_func(cstate_max_cap_mode, mode_lib->vba.DCHUBBUB_ARB_CSTATE_MAX_CAP_MODE);
 dml_get_attr_func(comp_buffer_size_kbytes, mode_lib->vba.CompressedBufferSizeInkByte);
 dml_get_attr_func(pixel_chunk_size_in_kbyte, mode_lib->vba.PixelChunkSizeInKByte);
@@ -120,6 +121,11 @@ dml_get_attr_func(min_meta_chunk_size_in_byte, mode_lib->vba.MinMetaChunkSizeByt
 dml_get_attr_func(fclk_watermark, mode_lib->vba.Watermark.FCLKChangeWatermark);
 dml_get_attr_func(usr_retraining_watermark, mode_lib->vba.Watermark.USRRetrainingWatermark);
 
+dml_get_attr_func(comp_buffer_reserved_space_kbytes, mode_lib->vba.CompBufReservedSpaceKBytes);
+dml_get_attr_func(comp_buffer_reserved_space_64bytes, mode_lib->vba.CompBufReservedSpace64B);
+dml_get_attr_func(comp_buffer_reserved_space_zs, mode_lib->vba.CompBufReservedSpaceZs);
+dml_get_attr_func(unbounded_request_enabled, mode_lib->vba.UnboundedRequestEnabled);
+
 #define dml_get_pipe_attr_func(attr, var)  double get_##attr(struct display_mode_lib *mode_lib, const display_e2e_pipe_params_st *pipes, unsigned int num_pipes, unsigned int which_pipe) \
 {\
 	unsigned int which_plane; \
@@ -841,6 +847,9 @@ static void fetch_pipe_params(struct display_mode_lib *mode_lib)
 
 	mode_lib->vba.SynchronizeTimingsFinal = pipes[0].pipe.dest.synchronize_timings;
 	mode_lib->vba.DCCProgrammingAssumesScanDirectionUnknownFinal = false;
+
+	mode_lib->vba.DisableUnboundRequestIfCompBufReservedSpaceNeedAdjustment = 0;
+
 	mode_lib->vba.UseUnboundedRequesting = dm_unbounded_requesting;
 	for (k = 0; k < mode_lib->vba.cache_num_pipes; ++k) {
 		if (pipes[k].pipe.src.unbounded_req_mode == 0)
diff --git a/drivers/gpu/drm/amd/display/dc/dml/display_mode_vba.h b/drivers/gpu/drm/amd/display/dc/dml/display_mode_vba.h
index e95b2199d85a..47b149d4bfcf 100644
--- a/drivers/gpu/drm/amd/display/dc/dml/display_mode_vba.h
+++ b/drivers/gpu/drm/amd/display/dc/dml/display_mode_vba.h
@@ -67,6 +67,10 @@ dml_get_attr_decl(min_pixel_chunk_size_in_byte);
 dml_get_attr_decl(min_meta_chunk_size_in_byte);
 dml_get_attr_decl(fclk_watermark);
 dml_get_attr_decl(usr_retraining_watermark);
+dml_get_attr_decl(comp_buffer_reserved_space_kbytes);
+dml_get_attr_decl(comp_buffer_reserved_space_64bytes);
+dml_get_attr_decl(comp_buffer_reserved_space_zs);
+dml_get_attr_decl(unbounded_request_enabled);
 
 #define dml_get_pipe_attr_decl(attr) double get_##attr(struct display_mode_lib *mode_lib, const display_e2e_pipe_params_st *pipes, unsigned int num_pipes, unsigned int which_pipe)
 
@@ -467,6 +471,7 @@ struct vba_vars_st {
 	bool XFCEnabled[DC__NUM_DPP__MAX];
 	bool ScalerEnabled[DC__NUM_DPP__MAX];
 	unsigned int VBlankNom[DC__NUM_DPP__MAX];
+	bool DisableUnboundRequestIfCompBufReservedSpaceNeedAdjustment;
 
 	// Intermediates/Informational
 	bool ImmediateFlipSupport;
@@ -510,6 +515,10 @@ struct vba_vars_st {
 	double StutterPeriodBestCase;
 	Watermarks      Watermark;
 	bool DCHUBBUB_ARB_CSTATE_MAX_CAP_MODE;
+	unsigned int CompBufReservedSpaceKBytes;
+	unsigned int CompBufReservedSpace64B;
+	unsigned int CompBufReservedSpaceZs;
+	bool CompBufReservedSpaceNeedAdjustment;
 
 	// These are the clocks calcuated by the library but they are not actually
 	// used explicitly. They are fetched by tests and then possibly used. The