drm/amd/display: truncate scaling ratios and inits to 19 bit precision

Signed-off-by: Dmytro Laktyushkin <Dmytro.Laktyushkin@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 17 insertions, 8 deletions

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_resource.c b/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
index 082458f2097c..751f3ac9d921 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
@@ -652,6 +652,14 @@ static void calculate_scaling_ratios(struct pipe_ctx *pipe_ctx)
                 pipe_ctx->plane_res.scl_data.ratios.horz_c.value /= 2;
                 pipe_ctx->plane_res.scl_data.ratios.vert_c.value /= 2;
         }
+        pipe_ctx->plane_res.scl_data.ratios.horz = dc_fixpt_truncate(
+                        pipe_ctx->plane_res.scl_data.ratios.horz, 19);
+        pipe_ctx->plane_res.scl_data.ratios.vert = dc_fixpt_truncate(
+                        pipe_ctx->plane_res.scl_data.ratios.vert, 19);
+        pipe_ctx->plane_res.scl_data.ratios.horz_c = dc_fixpt_truncate(
+                        pipe_ctx->plane_res.scl_data.ratios.horz_c, 19);
+        pipe_ctx->plane_res.scl_data.ratios.vert_c = dc_fixpt_truncate(
+                        pipe_ctx->plane_res.scl_data.ratios.vert_c, 19);
 }
 
 static void calculate_inits_and_adj_vp(struct pipe_ctx *pipe_ctx, struct view *recout_skip)
@@ -688,17 +696,18 @@ static void calculate_inits_and_adj_vp(struct pipe_ctx *pipe_ctx, struct view *r
          *      init_bot = init + scaling_ratio
          *      init_c = init + truncated_vp_c_offset(from calculate viewport)
          */
-        data->inits.h = dc_fixpt_div_int(
-                        dc_fixpt_add_int(data->ratios.horz, data->taps.h_taps + 1), 2);
+        data->inits.h = dc_fixpt_truncate(dc_fixpt_div_int(
+                        dc_fixpt_add_int(data->ratios.horz, data->taps.h_taps + 1), 2), 19);
 
-        data->inits.h_c = dc_fixpt_add(data->inits.h_c, dc_fixpt_div_int(
-                        dc_fixpt_add_int(data->ratios.horz_c, data->taps.h_taps_c + 1), 2));
+        data->inits.h_c = dc_fixpt_truncate(dc_fixpt_add(data->inits.h_c, dc_fixpt_div_int(
+                        dc_fixpt_add_int(data->ratios.horz_c, data->taps.h_taps_c + 1), 2)), 19);
 
-        data->inits.v = dc_fixpt_div_int(
-                        dc_fixpt_add_int(data->ratios.vert, data->taps.v_taps + 1), 2);
+        data->inits.v = dc_fixpt_truncate(dc_fixpt_div_int(
+                        dc_fixpt_add_int(data->ratios.vert, data->taps.v_taps + 1), 2), 19);
+
+        data->inits.v_c = dc_fixpt_truncate(dc_fixpt_add(data->inits.v_c, dc_fixpt_div_int(
+                        dc_fixpt_add_int(data->ratios.vert_c, data->taps.v_taps_c + 1), 2)), 19);
 
-        data->inits.v_c = dc_fixpt_add(data->inits.v_c, dc_fixpt_div_int(
-                        dc_fixpt_add_int(data->ratios.vert_c, data->taps.v_taps_c + 1), 2));
 
 
         /* Adjust for viewport end clip-off */