drm/amd/display: fix 32 bit compilation errors in dc_dmub_srv.c

There are several things wrong here.  First, none of these
numbers are FP, so there is no need to cast to double.  Next
make sure to use proper 64 bit division helpers.

Fixes: 85f4bc0c ("drm/amd/display: Add SubVP required code")
Reviewed-by: NHarry Wentland <harry.wentland@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/Makefile

@@ -22,31 +22,6 @@
 #
 # Makefile for Display Core (dc) component.
 
-ifdef CONFIG_X86
-dmub_ccflags := -mhard-float -msse
-endif
-
-ifdef CONFIG_PPC64
-dmub_ccflags := -mhard-float -maltivec
-endif
-
-ifdef CONFIG_CC_IS_GCC
-ifeq ($(call cc-ifversion, -lt, 0701, y), y)
-IS_OLD_GCC = 1
-endif
-endif
-
-ifdef CONFIG_X86
-ifdef IS_OLD_GCC
-# Stack alignment mismatch, proceed with caution.
-# GCC < 7.1 cannot compile code using `double` and -mpreferred-stack-boundary=3
-# (8B stack alignment).
-dmub_ccflags += -mpreferred-stack-boundary=4
-else
-dmub_ccflags += -msse2
-endif
-endif
-
 DC_LIBS = basics bios dml clk_mgr dce gpio irq link virtual
 
 ifdef CONFIG_DRM_AMD_DC_DCN
@@ -99,7 +74,6 @@ AMD_DISPLAY_FILES += $(AMD_DISPLAY_CORE)
 AMD_DISPLAY_FILES += $(AMD_DM_REG_UPDATE)
 
 DC_DMUB += dc_dmub_srv.o
-CFLAGS_$(AMDDALPATH)/dc/dc_dmub_srv.o := $(dmub_ccflags)
 DC_EDID += dc_edid_parser.o
 AMD_DISPLAY_DMUB = $(addprefix $(AMDDALPATH)/dc/,$(DC_DMUB))
 AMD_DISPLAY_EDID = $(addprefix $(AMDDALPATH)/dc/,$(DC_EDID))

drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c

@@ -416,27 +416,28 @@ static void populate_subvp_cmd_drr_info(struct dc *dc,
 	pipe_data->pipe_config.vblank_data.drr_info.use_ramping = false; // for now don't use ramping
 	pipe_data->pipe_config.vblank_data.drr_info.drr_window_size_ms = 4; // hardcode 4ms DRR window for now
 
-	drr_frame_us = drr_timing->v_total * drr_timing->h_total /
-			(double)(drr_timing->pix_clk_100hz * 100) * 1000000;
+	drr_frame_us = div64_s64(drr_timing->v_total * drr_timing->h_total,
+				 (int64_t)(drr_timing->pix_clk_100hz * 100) * 1000000);
 	// P-State allow width and FW delays already included phantom_timing->v_addressable
-	mall_region_us = phantom_timing->v_addressable * phantom_timing->h_total /
-			(double)(phantom_timing->pix_clk_100hz * 100) * 1000000;
+	mall_region_us = div64_s64(phantom_timing->v_addressable * phantom_timing->h_total,
+				   (int64_t)(phantom_timing->pix_clk_100hz * 100) * 1000000);
 	min_drr_supported_us = drr_frame_us + mall_region_us + SUBVP_DRR_MARGIN_US;
-	min_vtotal_supported = drr_timing->pix_clk_100hz * 100 * ((double)min_drr_supported_us / 1000000) /
-			(double)drr_timing->h_total;
-
-	prefetch_us = (phantom_timing->v_total - phantom_timing->v_front_porch) * phantom_timing->h_total /
-			(double)(phantom_timing->pix_clk_100hz * 100) * 1000000 +
-			dc->caps.subvp_prefetch_end_to_mall_start_us;
-	subvp_active_us = main_timing->v_addressable * main_timing->h_total /
-			(double)(main_timing->pix_clk_100hz * 100) * 1000000;
-	drr_active_us = drr_timing->v_addressable * drr_timing->h_total /
-			(double)(drr_timing->pix_clk_100hz * 100) * 1000000;
-	max_drr_vblank_us = (double)(subvp_active_us - prefetch_us - drr_active_us) / 2 + drr_active_us;
+	min_vtotal_supported = div64_s64(drr_timing->pix_clk_100hz * 100 *
+					 (div64_s64((int64_t)min_drr_supported_us, 1000000)),
+					 (int64_t)drr_timing->h_total);
+
+	prefetch_us = div64_s64((phantom_timing->v_total - phantom_timing->v_front_porch) * phantom_timing->h_total,
+				(int64_t)(phantom_timing->pix_clk_100hz * 100) * 1000000 +
+				dc->caps.subvp_prefetch_end_to_mall_start_us);
+	subvp_active_us = div64_s64(main_timing->v_addressable * main_timing->h_total,
+				    (int64_t)(main_timing->pix_clk_100hz * 100) * 1000000);
+	drr_active_us = div64_s64(drr_timing->v_addressable * drr_timing->h_total,
+				  (int64_t)(drr_timing->pix_clk_100hz * 100) * 1000000);
+	max_drr_vblank_us = div64_s64((int64_t)(subvp_active_us - prefetch_us - drr_active_us), 2) + drr_active_us;
 	max_drr_mallregion_us = subvp_active_us - prefetch_us - mall_region_us;
 	max_drr_supported_us = max_drr_vblank_us > max_drr_mallregion_us ? max_drr_vblank_us : max_drr_mallregion_us;
-	max_vtotal_supported = drr_timing->pix_clk_100hz * 100 * ((double)max_drr_supported_us / 1000000) /
-			(double)drr_timing->h_total;
+	max_vtotal_supported = div64_s64(drr_timing->pix_clk_100hz * 100 * (div64_s64((int64_t)max_drr_supported_us, 1000000)),
+					 (int64_t)drr_timing->h_total);
 
 	pipe_data->pipe_config.vblank_data.drr_info.min_vtotal_supported = min_vtotal_supported;
 	pipe_data->pipe_config.vblank_data.drr_info.max_vtotal_supported = max_vtotal_supported;
@@ -530,10 +531,10 @@ static void update_subvp_prefetch_end_to_mall_start(struct dc *dc,
 	struct dc_crtc_timing *phantom_timing1 = &subvp_pipes[1]->stream->mall_stream_config.paired_stream->timing;
 	struct dmub_cmd_fw_assisted_mclk_switch_pipe_data_v2 *pipe_data = NULL;
 
-	subvp0_prefetch_us = (phantom_timing0->v_total - phantom_timing0->v_front_porch) * phantom_timing0->h_total /
-				(double)(phantom_timing0->pix_clk_100hz * 100) * 1000000 + dc->caps.subvp_prefetch_end_to_mall_start_us;
-	subvp1_prefetch_us = (phantom_timing1->v_total - phantom_timing1->v_front_porch) * phantom_timing1->h_total /
-					(double)(phantom_timing1->pix_clk_100hz * 100) * 1000000 + dc->caps.subvp_prefetch_end_to_mall_start_us;
+	subvp0_prefetch_us = div64_s64((phantom_timing0->v_total - phantom_timing0->v_front_porch) * phantom_timing0->h_total,
+				       (int64_t)(phantom_timing0->pix_clk_100hz * 100) * 1000000 + dc->caps.subvp_prefetch_end_to_mall_start_us);
+	subvp1_prefetch_us = div64_s64((phantom_timing1->v_total - phantom_timing1->v_front_porch) * phantom_timing1->h_total,
+				       (int64_t)(phantom_timing1->pix_clk_100hz * 100) * 1000000 + dc->caps.subvp_prefetch_end_to_mall_start_us);
 
 	// Whichever SubVP PIPE has the smaller prefetch (including the prefetch end to mall start time)
 	// should increase it's prefetch time to match the other
@@ -541,16 +542,16 @@ static void update_subvp_prefetch_end_to_mall_start(struct dc *dc,
 		pipe_data = &cmd->fw_assisted_mclk_switch_v2.config_data.pipe_data[1];
 		prefetch_delta_us = subvp0_prefetch_us - subvp1_prefetch_us;
 		pipe_data->pipe_config.subvp_data.prefetch_to_mall_start_lines =
-					(((double)(dc->caps.subvp_prefetch_end_to_mall_start_us + prefetch_delta_us) / 1000000) *
-					(phantom_timing1->pix_clk_100hz * 100) + phantom_timing1->h_total - 1) /
-					(double)phantom_timing1->h_total;
+			div64_s64(((div64_s64((int64_t)(dc->caps.subvp_prefetch_end_to_mall_start_us + prefetch_delta_us), 1000000)) *
+				   (phantom_timing1->pix_clk_100hz * 100) + phantom_timing1->h_total - 1),
+				  (int64_t)phantom_timing1->h_total);
 	} else if (subvp1_prefetch_us >  subvp0_prefetch_us) {
 		pipe_data = &cmd->fw_assisted_mclk_switch_v2.config_data.pipe_data[0];
 		prefetch_delta_us = subvp1_prefetch_us - subvp0_prefetch_us;
 		pipe_data->pipe_config.subvp_data.prefetch_to_mall_start_lines =
-					(((double)(dc->caps.subvp_prefetch_end_to_mall_start_us + prefetch_delta_us) / 1000000) *
-					(phantom_timing0->pix_clk_100hz * 100) + phantom_timing0->h_total - 1) /
-					(double)phantom_timing0->h_total;
+			div64_s64(((div64_s64((int64_t)(dc->caps.subvp_prefetch_end_to_mall_start_us + prefetch_delta_us), 1000000)) *
+				   (phantom_timing0->pix_clk_100hz * 100) + phantom_timing0->h_total - 1),
+				  (int64_t)phantom_timing0->h_total);
 	}
 }
 
@@ -601,13 +602,13 @@ static void populate_subvp_cmd_pipe_info(struct dc *dc,
 
 	// Round up
 	pipe_data->pipe_config.subvp_data.prefetch_to_mall_start_lines =
-			(((double)dc->caps.subvp_prefetch_end_to_mall_start_us / 1000000) *
-			(phantom_timing->pix_clk_100hz * 100) + phantom_timing->h_total - 1) /
-			(double)phantom_timing->h_total;
+		div64_s64(((div64_s64((int64_t)dc->caps.subvp_prefetch_end_to_mall_start_us, 1000000)) *
+			   (phantom_timing->pix_clk_100hz * 100) + phantom_timing->h_total - 1),
+			  (int64_t)phantom_timing->h_total);
 	pipe_data->pipe_config.subvp_data.processing_delay_lines =
-			(((double)dc->caps.subvp_fw_processing_delay_us / 1000000) *
-			(phantom_timing->pix_clk_100hz * 100) + phantom_timing->h_total - 1) /
-			(double)phantom_timing->h_total;
+		div64_s64(((div64_s64((int64_t)dc->caps.subvp_fw_processing_delay_us, 1000000)) *
+			   (phantom_timing->pix_clk_100hz * 100) + phantom_timing->h_total - 1),
+			  (int64_t)phantom_timing->h_total);
 	// Find phantom pipe index based on phantom stream
 	for (j = 0; j < dc->res_pool->pipe_count; j++) {
 		struct pipe_ctx *phantom_pipe = &context->res_ctx.pipe_ctx[j];