drm/amd/display: enable dchub request limit for DCN 3.2.x

[why]
HW recommend we enable this for better DF QoS for DCN 3.2.x

[how]
Add interfaces to hubbub to program register
Add initialization as part of init_hw
Add default settings for DCN 3.2.x
Add registry override for debug/tuning
Reviewed-by: Alvin Lee <Alvin.Lee2@amd.com>
Acked-by: Tom Chung <chiahsuan.chung@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>

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

@@ -408,6 +408,7 @@ struct dc_config {
 	bool use_default_clock_table;
 	bool force_bios_enable_lttpr;
 	uint8_t force_bios_fixed_vs;
+	int sdpif_request_limit_words_per_umc;
 
 };
 

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hubbub.h

@@ -171,6 +171,7 @@ struct dcn_hubbub_registers {
 	uint32_t DCHUBBUB_ARB_FCLK_PSTATE_CHANGE_WATERMARK_B;
 	uint32_t DCHUBBUB_ARB_FCLK_PSTATE_CHANGE_WATERMARK_C;
 	uint32_t DCHUBBUB_ARB_FCLK_PSTATE_CHANGE_WATERMARK_D;
+	uint32_t SDPIF_REQUEST_RATE_LIMIT;
 };
 
 #define HUBBUB_REG_FIELD_LIST_DCN32(type) \
@@ -360,7 +361,8 @@ struct dcn_hubbub_registers {
 		type DCHUBBUB_ARB_ALLOW_SR_ENTER_WATERMARK_Z8_C;\
 		type DCHUBBUB_ARB_ALLOW_SR_EXIT_WATERMARK_Z8_C;\
 		type DCHUBBUB_ARB_ALLOW_SR_ENTER_WATERMARK_Z8_D;\
-		type DCHUBBUB_ARB_ALLOW_SR_EXIT_WATERMARK_Z8_D
+		type DCHUBBUB_ARB_ALLOW_SR_EXIT_WATERMARK_Z8_D;\
+		type SDPIF_REQUEST_RATE_LIMIT
 
 
 struct dcn_hubbub_shift {

drivers/gpu/drm/amd/display/dc/dcn32/dcn32_hubbub.c

@@ -72,6 +72,23 @@ static void dcn32_init_crb(struct hubbub *hubbub)
 	REG_UPDATE(DCHUBBUB_DEBUG_CTRL_0, DET_DEPTH, 0x47F);
 }
 
+void hubbub32_set_request_limit(struct hubbub *hubbub, int memory_channel_count, int words_per_channel)
+{
+	struct dcn20_hubbub *hubbub2 = TO_DCN20_HUBBUB(hubbub);
+
+	uint32_t request_limit = 3 * memory_channel_count * words_per_channel / 4;
+
+	ASSERT((request_limit & (~0xFFF)) == 0); //field is only 24 bits long
+	ASSERT(request_limit > 0); //field is only 24 bits long
+
+	if (request_limit > 0xFFF)
+		request_limit = 0xFFF;
+
+	if (request_limit > 0)
+		REG_UPDATE(SDPIF_REQUEST_RATE_LIMIT, SDPIF_REQUEST_RATE_LIMIT, request_limit);
+}
+
+
 void dcn32_program_det_size(struct hubbub *hubbub, int hubp_inst, unsigned int det_buffer_size_in_kbyte)
 {
 	struct dcn20_hubbub *hubbub2 = TO_DCN20_HUBBUB(hubbub);
@@ -949,6 +966,7 @@ static const struct hubbub_funcs hubbub32_funcs = {
 	.init_crb = dcn32_init_crb,
 	.hubbub_read_state = hubbub2_read_state,
 	.force_usr_retraining_allow = hubbub32_force_usr_retraining_allow,
+	.set_request_limit = hubbub32_set_request_limit
 };
 
 void hubbub32_construct(struct dcn20_hubbub *hubbub2,

drivers/gpu/drm/amd/display/dc/dcn32/dcn32_hubbub.h

@@ -82,7 +82,8 @@
 	SR(DCN_VM_FAULT_ADDR_MSB),\
 	SR(DCN_VM_FAULT_ADDR_LSB),\
 	SR(DCN_VM_FAULT_CNTL),\
-	SR(DCN_VM_FAULT_STATUS)
+	SR(DCN_VM_FAULT_STATUS),\
+	SR(SDPIF_REQUEST_RATE_LIMIT)
 
 #define HUBBUB_MASK_SH_LIST_DCN32(mask_sh)\
 	HUBBUB_SF(DCHUBBUB_GLOBAL_TIMER_CNTL, DCHUBBUB_GLOBAL_TIMER_ENABLE, mask_sh), \
@@ -159,7 +160,8 @@
 	HUBBUB_SF(DCN_VM_FAULT_STATUS, DCN_VM_ERROR_VMID, mask_sh), \
 	HUBBUB_SF(DCN_VM_FAULT_STATUS, DCN_VM_ERROR_TABLE_LEVEL, mask_sh), \
 	HUBBUB_SF(DCN_VM_FAULT_STATUS, DCN_VM_ERROR_PIPE, mask_sh), \
-	HUBBUB_SF(DCN_VM_FAULT_STATUS, DCN_VM_ERROR_INTERRUPT_STATUS, mask_sh)
+	HUBBUB_SF(DCN_VM_FAULT_STATUS, DCN_VM_ERROR_INTERRUPT_STATUS, mask_sh),\
+	HUBBUB_SF(SDPIF_REQUEST_RATE_LIMIT, SDPIF_REQUEST_RATE_LIMIT, mask_sh)
 
 bool hubbub32_program_urgent_watermarks(
 		struct hubbub *hubbub,
@@ -200,4 +202,6 @@ void hubbub32_construct(struct dcn20_hubbub *hubbub2,
 	int pixel_chunk_size_kb,
 	int config_return_buffer_size_kb);
 
+void hubbub32_set_request_limit(struct hubbub *hubbub, int umc_count, int words_per_umc);
+
 #endif

drivers/gpu/drm/amd/display/dc/dcn32/dcn32_hwseq.c

@@ -984,6 +984,9 @@ void dcn32_init_hw(struct dc *dc)
 	if (dc->res_pool->hubbub->funcs->init_crb)
 		dc->res_pool->hubbub->funcs->init_crb(dc->res_pool->hubbub);
 
+	if (dc->res_pool->hubbub->funcs->set_request_limit && dc->config.sdpif_request_limit_words_per_umc > 0)
+		dc->res_pool->hubbub->funcs->set_request_limit(dc->res_pool->hubbub, dc->ctx->dc_bios->vram_info.num_chans, dc->config.sdpif_request_limit_words_per_umc);
+
 	// Get DMCUB capabilities
 	if (dc->ctx->dmub_srv) {
 		dc_dmub_srv_query_caps_cmd(dc->ctx->dmub_srv->dmub);

drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.c

@@ -2414,6 +2414,9 @@ static bool dcn32_resource_construct(
 		pool->base.oem_device = NULL;
 	}
 
+	if (ASICREV_IS_GC_11_0_3(dc->ctx->asic_id.hw_internal_rev) && (dc->config.sdpif_request_limit_words_per_umc == 0))
+		dc->config.sdpif_request_limit_words_per_umc = 16;
+
 	DC_FP_END();
 
 	return true;

drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.h

@@ -1244,7 +1244,8 @@ void dcn32_restore_mall_state(struct dc *dc,
       SR(DCHUBBUB_ARB_FCLK_PSTATE_CHANGE_WATERMARK_C),                         \
       SR(DCHUBBUB_ARB_FCLK_PSTATE_CHANGE_WATERMARK_D),                         \
       SR(DCN_VM_FAULT_ADDR_MSB), SR(DCN_VM_FAULT_ADDR_LSB),                    \
-      SR(DCN_VM_FAULT_CNTL), SR(DCN_VM_FAULT_STATUS)                           \
+      SR(DCN_VM_FAULT_CNTL), SR(DCN_VM_FAULT_STATUS),                          \
+      SR(SDPIF_REQUEST_RATE_LIMIT)                                             \
   )
 
 /* DCCG */

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

@@ -186,6 +186,7 @@ struct hubbub_funcs {
 	void (*program_compbuf_size)(struct hubbub *hubbub, unsigned compbuf_size_kb, bool safe_to_increase);
 	void (*init_crb)(struct hubbub *hubbub);
 	void (*force_usr_retraining_allow)(struct hubbub *hubbub, bool allow);
+	void (*set_request_limit)(struct hubbub *hubbub, int memory_channel_count, int words_per_channel);
 };
 
 struct hubbub {