drm/amd/display: Calculate ODM width using odm slice rect, not recout

[Description]
There are scenarios where ODM4:1 is used but the
surface is entirely outside of the first and last
ODM slice. In this case the recout.width for the
first and last slice is 0 because there's no overlap
with the surface and that ODM slice, but this causes
the x_pos for the cursor in this scenario to be
calculated incorrectly. Instead we should use the
ODM slice width instead of the recout width.
Reviewed-by: Nevenko Stupar <nevenko.stupar@amd.com>
Signed-off-by: Jerry Zuo <jerry.zuo@amd.com>
Signed-off-by: Alvin Lee <alvin.lee2@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/hwss/dcn401/dcn401_hwseq.c

@@ -1115,10 +1115,10 @@ void dcn401_set_cursor_position(struct pipe_ctx *pipe_ctx)
 		.mirror = pipe_ctx->plane_state->horizontal_mirror,
 		.stream = pipe_ctx->stream
 	};
+	struct rect odm_slice_src = { 0 };
 	bool odm_combine_on = (pipe_ctx->next_odm_pipe != NULL) ||
 		(pipe_ctx->prev_odm_pipe != NULL);
 	int prev_odm_width = 0;
-	int prev_odm_offset = 0;
 	struct pipe_ctx *prev_odm_pipe = NULL;
 	bool mpc_combine_on = false;
 	int  bottom_pipe_x_pos = 0;
@@ -1183,12 +1183,12 @@ void dcn401_set_cursor_position(struct pipe_ctx *pipe_ctx)
 		prev_odm_pipe = pipe_ctx->prev_odm_pipe;
 
 		while (prev_odm_pipe != NULL) {
-			prev_odm_width += prev_odm_pipe->plane_res.scl_data.recout.width;
-			prev_odm_offset += prev_odm_pipe->plane_res.scl_data.recout.x;
+			odm_slice_src = resource_get_odm_slice_src_rect(prev_odm_pipe);
+			prev_odm_width += odm_slice_src.width;
 			prev_odm_pipe = prev_odm_pipe->prev_odm_pipe;
 		}
 
-		x_pos -= (prev_odm_width + prev_odm_offset);
+		x_pos -= (prev_odm_width);
 	}
 
 	/* If the position is negative then we need to add to the hotspot