pcs: tx: Process link failure synchronously

There's no strict requirement for us to handle linke failures immediately.
The PMA's link timer will ensure the signal stays low, so we don't have to
worry about missing it. This fixes some strange Xs during initialization.

Fixes: d351291 ("Initial commit")
Signed-off-by: Sean Anderson <seanga2@gmail.com>

rtl/pcs.v

@@ -209,14 +209,15 @@ module pcs_tx (
 		end
 		endcase
 
+		if (!link_status) begin
+			tx_next = 0;
+			code_next = `CODE_I;
+			state_next = IDLE;
+		end
 	end
 
-	always @(posedge clk, negedge link_status) begin
-		if (!link_status) begin
-			tx <= 0;
-			code <= `CODE_I;
-			state <= IDLE;
-		end else if (ce) begin
+	always @(posedge clk) begin
+		if (ce) begin
 			last_data <= data;
 			tx <= tx_next;
 			code <= code_next;