drm/amd/display: Add SMU interface to get UMC count for dcn401

[WHY&HOW]
BIOS table will not always contain accurate UMC channel info when
harvesting is enabled, so get the correct info from SMU.

Reviewed-by: Alvin Lee <alvin.lee2@amd.com>
Signed-off-by: Dillon Varone <dillon.varone@amd.com>
Signed-off-by: Tom Chung <chiahsuan.chung@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

Author: Dillon Varone

drivers/gpu/drm/amd/display/dc/clk_mgr/dcn401/dalsmc.h

@@ -43,7 +43,9 @@
 #define DALSMC_MSG_ActiveUclkFclk                 0x18
 #define DALSMC_MSG_IdleUclkFclk                   0x19
 #define DALSMC_MSG_SetUclkPstateAllow             0x1A
-#define DALSMC_Message_Count                      0x1B
+#define DALSMC_MSG_SubvpUclkFclk                  0x1B
+#define DALSMC_MSG_GetNumUmcChannels              0x1C
+#define DALSMC_Message_Count                      0x1D
 
 typedef enum {
   FCLK_SWITCH_DISALLOW,

drivers/gpu/drm/amd/display/dc/clk_mgr/dcn401/dcn401_clk_mgr.c

@@ -1403,6 +1403,15 @@ static void dcn401_get_memclk_states_from_smu(struct clk_mgr *clk_mgr_base)
 	if (clk_mgr->dpm_present && !num_levels)
 		clk_mgr->dpm_present = false;
 
+	clk_mgr_base->bw_params->num_channels = dcn401_smu_get_num_of_umc_channels(clk_mgr);
+	if (clk_mgr_base->ctx->dc_bios) {
+		/* use BIOS values if none provided by PMFW */
+		if (clk_mgr_base->bw_params->num_channels == 0) {
+			clk_mgr_base->bw_params->num_channels = clk_mgr_base->ctx->dc_bios->vram_info.num_chans;
+		}
+		clk_mgr_base->bw_params->dram_channel_width_bytes = clk_mgr_base->ctx->dc_bios->vram_info.dram_channel_width_bytes;
+	}
+
 	/* Refresh bounding box */
 	clk_mgr_base->ctx->dc->res_pool->funcs->update_bw_bounding_box(
 			clk_mgr->base.ctx->dc, clk_mgr_base->bw_params);

drivers/gpu/drm/amd/display/dc/clk_mgr/dcn401/dcn401_clk_mgr_smu_msg.c

@@ -25,6 +25,9 @@
 #ifndef DALSMC_MSG_SubvpUclkFclk
 #define DALSMC_MSG_SubvpUclkFclk 0x1B
 #endif
+#ifndef DALSMC_MSG_GetNumUmcChannels
+#define DALSMC_MSG_GetNumUmcChannels 0x1C
+#endif
 
 /*
  * Function to be used instead of REG_WAIT macro because the wait ends when
@@ -334,3 +337,14 @@ void dcn401_smu_set_num_of_displays(struct clk_mgr_internal *clk_mgr, uint32_t n
 	dcn401_smu_send_msg_with_param(clk_mgr,
 			DALSMC_MSG_NumOfDisplays, num_displays, NULL);
 }
+
+unsigned int dcn401_smu_get_num_of_umc_channels(struct clk_mgr_internal *clk_mgr)
+{
+	unsigned int response = 0;
+
+	dcn401_smu_send_msg_with_param(clk_mgr, DALSMC_MSG_GetNumUmcChannels, 0, &response);
+
+	smu_print("SMU Get Num UMC Channels: num_umc_channels = %d\n", response);
+
+	return response;
+}

drivers/gpu/drm/amd/display/dc/clk_mgr/dcn401/dcn401_clk_mgr_smu_msg.h

@@ -28,5 +28,6 @@ bool dcn401_smu_set_subvp_uclk_fclk_hardmin(struct clk_mgr_internal *clk_mgr,
 		uint16_t fclk_freq_mhz);
 void dcn401_smu_set_min_deep_sleep_dcef_clk(struct clk_mgr_internal *clk_mgr, uint32_t freq_mhz);
 void dcn401_smu_set_num_of_displays(struct clk_mgr_internal *clk_mgr, uint32_t num_displays);
+unsigned int dcn401_smu_get_num_of_umc_channels(struct clk_mgr_internal *clk_mgr);
 
 #endif /* __DCN401_CLK_MGR_SMU_MSG_H_ */

drivers/gpu/drm/amd/display/dc/dml2/dml21/dml21_translation_helper.c

@@ -294,12 +294,17 @@ void dml21_apply_soc_bb_overrides(struct dml2_initialize_instance_in_out *dml_in
 		dml_soc_bb->power_management_parameters.stutter_exit_latency_us =
 			(in_dc->ctx->dc_bios->bb_info.dram_sr_exit_latency_100ns + 9) / 10;
 
-	if (in_dc->ctx->dc_bios->vram_info.num_chans) {
+	if (dc_bw_params->num_channels) {
+		dml_clk_table->dram_config.channel_count = dc_bw_params->num_channels;
+		dml_soc_bb->mall_allocated_for_dcn_mbytes = in_dc->caps.mall_size_total / 1048576;
+	} else if (in_dc->ctx->dc_bios->vram_info.num_chans) {
 		dml_clk_table->dram_config.channel_count = in_dc->ctx->dc_bios->vram_info.num_chans;
 		dml_soc_bb->mall_allocated_for_dcn_mbytes = in_dc->caps.mall_size_total / 1048576;
 	}
 
-	if (in_dc->ctx->dc_bios->vram_info.dram_channel_width_bytes) {
+	if (dc_bw_params->dram_channel_width_bytes) {
+		dml_clk_table->dram_config.channel_width_bytes = dc_bw_params->dram_channel_width_bytes;
+	} else if (in_dc->ctx->dc_bios->vram_info.dram_channel_width_bytes) {
 		dml_clk_table->dram_config.channel_width_bytes = in_dc->ctx->dc_bios->vram_info.dram_channel_width_bytes;
 	}
 

drivers/gpu/drm/amd/display/dc/resource/dcn401/dcn401_resource.c

@@ -1297,6 +1297,29 @@ static struct hpo_dp_link_encoder *dcn401_hpo_dp_link_encoder_create(
 	return &hpo_dp_enc31->base;
 }
 
+static unsigned int dcn401_calc_num_avail_chans_for_mall(struct dc *dc, unsigned int num_chans)
+{
+	unsigned int num_available_chans = 1;
+
+	/* channels for MALL must be a power of 2 */
+	while (num_chans > 1) {
+		num_available_chans = (num_available_chans << 1);
+		num_chans = (num_chans >> 1);
+	}
+
+	/* cannot be odd */
+	num_available_chans &= ~1;
+
+	/* clamp to max available channels for MALL per ASIC */
+	if (ASICREV_IS_GC_12_0_0_A0(dc->ctx->asic_id.hw_internal_rev)) {
+		num_available_chans = num_available_chans > 16 ? 16 : num_available_chans;
+	} else if (ASICREV_IS_GC_12_0_1_A0(dc->ctx->asic_id.hw_internal_rev)) {
+		num_available_chans = num_available_chans > 8 ? 8 : num_available_chans;
+	}
+
+	return num_available_chans;
+}
+
 static struct dce_hwseq *dcn401_hwseq_create(
 	struct dc_context *ctx)
 {
@@ -1592,6 +1615,14 @@ static void dcn401_update_bw_bounding_box(struct dc *dc, struct clk_bw_params *b
 
 	memcpy(dml2_opt, &dc->dml2_options, sizeof(dc->dml2_options));
 
+	/* re-calculate the available MALL size if required */
+	if (bw_params->num_channels > 0) {
+		dc->caps.max_cab_allocation_bytes = dcn401_calc_num_avail_chans_for_mall(
+			dc, bw_params->num_channels) *
+			dc->caps.mall_size_per_mem_channel * 1024 * 1024;
+		dc->caps.mall_size_total = dc->caps.max_cab_allocation_bytes;
+	}
+
 	DC_FP_START();
 
 	dcn401_update_bw_bounding_box_fpu(dc, bw_params);
@@ -1714,29 +1745,6 @@ static unsigned int dcn401_get_vstartup_for_pipe(struct pipe_ctx *pipe_ctx)
 	return pipe_ctx->global_sync.dcn4x.vstartup_lines;
 }
 
-static unsigned int dcn401_calc_num_avail_chans_for_mall(struct dc *dc, unsigned int num_chans)
-{
-	unsigned int num_available_chans = 1;
-
-	/* channels for MALL must be a power of 2 */
-	while (num_chans > 1) {
-		num_available_chans = (num_available_chans << 1);
-		num_chans = (num_chans >> 1);
-	}
-
-	/* cannot be odd */
-	num_available_chans &= ~1;
-
-	/* clamp to max available channels for MALL per ASIC */
-	if (ASICREV_IS_GC_12_0_0_A0(dc->ctx->asic_id.hw_internal_rev)) {
-		num_available_chans = num_available_chans > 16 ? 16 : num_available_chans;
-	} else if (ASICREV_IS_GC_12_0_1_A0(dc->ctx->asic_id.hw_internal_rev)) {
-		num_available_chans = num_available_chans > 8 ? 8 : num_available_chans;
-	}
-
-	return num_available_chans;
-}
-
 static struct resource_funcs dcn401_res_pool_funcs = {
 	.destroy = dcn401_destroy_resource_pool,
 	.link_enc_create = dcn401_link_encoder_create,