drm/amd/display: fix missing cursor on some rotated SLS displays

[Why]
Cursor disappears for some SLS displays that are rotated 180
and 270 degrees.  This occurs when there is no pipe split being
done ( ex. 3 or more displays ).  The cursor calculations assume
pipe splitting is done so when it calculates the new cursor
position in hwss.set_cursor_position(), it is out-of-bounds so
it disables the cursor in hubp.set_cursor_position().

[How]
In non pipe split cases, calculate cursor using viewport size
( width or height ) instead of viewport size * 2 ( the two
because pipe splitting divides the rectangle into two ).
Signed-off-by: Samson Tam <Samson.Tam@amd.com>
Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c

@@ -2916,6 +2916,8 @@ void dcn10_set_cursor_position(struct pipe_ctx *pipe_ctx)
 		.rotation = pipe_ctx->plane_state->rotation,
 		.mirror = pipe_ctx->plane_state->horizontal_mirror
 	};
+	bool pipe_split_on = (pipe_ctx->top_pipe != NULL) ||
+		(pipe_ctx->bottom_pipe != NULL);
 
 	int x_plane = pipe_ctx->plane_state->dst_rect.x;
 	int y_plane = pipe_ctx->plane_state->dst_rect.y;
@@ -2948,6 +2950,7 @@ void dcn10_set_cursor_position(struct pipe_ctx *pipe_ctx)
 	// Swap axis and mirror horizontally
 	if (param.rotation == ROTATION_ANGLE_90) {
 		uint32_t temp_x = pos_cpy.x;
+
 		pos_cpy.x = pipe_ctx->plane_res.scl_data.viewport.width -
 				(pos_cpy.y - pipe_ctx->plane_res.scl_data.viewport.x) + pipe_ctx->plane_res.scl_data.viewport.x;
 		pos_cpy.y = temp_x;
@@ -2955,26 +2958,44 @@ void dcn10_set_cursor_position(struct pipe_ctx *pipe_ctx)
 	// Swap axis and mirror vertically
 	else if (param.rotation == ROTATION_ANGLE_270) {
 		uint32_t temp_y = pos_cpy.y;
-		if (pos_cpy.x >  pipe_ctx->plane_res.scl_data.viewport.height) {
-			pos_cpy.x = pos_cpy.x - pipe_ctx->plane_res.scl_data.viewport.height;
-			pos_cpy.y = pipe_ctx->plane_res.scl_data.viewport.height - pos_cpy.x;
-		} else {
-			pos_cpy.y = 2 * pipe_ctx->plane_res.scl_data.viewport.height - pos_cpy.x;
-		}
+		int viewport_height =
+			pipe_ctx->plane_res.scl_data.viewport.height;
+
+		if (pipe_split_on) {
+			if (pos_cpy.x > viewport_height) {
+				pos_cpy.x = pos_cpy.x - viewport_height;
+				pos_cpy.y = viewport_height - pos_cpy.x;
+			} else {
+				pos_cpy.y = 2 * viewport_height - pos_cpy.x;
+			}
+		} else
+			pos_cpy.y = viewport_height - pos_cpy.x;
 		pos_cpy.x = temp_y;
 	}
 	// Mirror horizontally and vertically
 	else if (param.rotation == ROTATION_ANGLE_180) {
-		if (pos_cpy.x >= pipe_ctx->plane_res.scl_data.viewport.width + pipe_ctx->plane_res.scl_data.viewport.x) {
-			pos_cpy.x = 2 * pipe_ctx->plane_res.scl_data.viewport.width
-					- pos_cpy.x + 2 * pipe_ctx->plane_res.scl_data.viewport.x;
-		} else {
-			uint32_t temp_x = pos_cpy.x;
-			pos_cpy.x = 2 * pipe_ctx->plane_res.scl_data.viewport.x - pos_cpy.x;
-			if (temp_x >= pipe_ctx->plane_res.scl_data.viewport.x + (int)hubp->curs_attr.width
-					|| pos_cpy.x <= (int)hubp->curs_attr.width + pipe_ctx->plane_state->src_rect.x) {
-				pos_cpy.x = temp_x + pipe_ctx->plane_res.scl_data.viewport.width;
+		int viewport_width =
+			pipe_ctx->plane_res.scl_data.viewport.width;
+		int viewport_x =
+			pipe_ctx->plane_res.scl_data.viewport.x;
+
+		if (pipe_split_on) {
+			if (pos_cpy.x >= viewport_width + viewport_x) {
+				pos_cpy.x = 2 * viewport_width
+						- pos_cpy.x + 2 * viewport_x;
+			} else {
+				uint32_t temp_x = pos_cpy.x;
+
+				pos_cpy.x = 2 * viewport_x - pos_cpy.x;
+				if (temp_x >= viewport_x +
+					(int)hubp->curs_attr.width || pos_cpy.x
+					<= (int)hubp->curs_attr.width +
+					pipe_ctx->plane_state->src_rect.x) {
+					pos_cpy.x = temp_x + viewport_width;
+				}
 			}
+		} else {
+			pos_cpy.x = viewport_width - pos_cpy.x + 2 * viewport_x;
 		}
 		pos_cpy.y = pipe_ctx->plane_res.scl_data.viewport.height - pos_cpy.y;
 	}