Revert "remove obsolete code"

This reverts commit 527d24a5fd.

shared/login.py

@@ -214,6 +214,20 @@ class LoginUX:
 
                 self.show_pin()
 
+    async def do_delay(self):
+        # show # of failures and implement the delay, which could be 
+        # very long.
+        dis.clear()
+        dis.text(None, 0, "Checking...", FontLarge)
+        dis.text(None, 24, 'Wait '+pretty_delay(pa.delay_required * pa.seconds_per_tick))
+        dis.text(None, 40, "(%d failures)" % pa.num_fails)
+
+        while pa.is_delay_needed():
+            dis.progress_bar(pa.delay_achieved / pa.delay_required)
+            dis.show()
+
+            pa.delay()
+
     async def we_are_ewaste(self, num_fails):
         msg = '''After %d failed PIN attempts this Coldcard is locked forever. \
 By design, there is no way to reset or recover the secure element, and its contents \
@@ -261,10 +275,13 @@ Press OK to continue, X to stop for now.
             dis.fullscreen("Wait...")
             pa.setup(pin)
 
-            if pa.num_fails > 3:
+            if version.has_608 and pa.num_fails > 3:
                 # they are approaching brickage, so warn them each attempt
                 await self.confirm_attempt(pa.attempts_left, pa.num_fails, pin)
                 dis.fullscreen("Wait...")
+            elif pa.is_delay_needed():
+                # mark 1/2 might come here, never mark3
+                await self.do_delay()
 
             # do the actual login attempt now
             try:

shared/pincodes.py

@@ -308,6 +308,12 @@ class PinAttempt:
 
         return rv
 
+    def is_delay_needed(self):
+        # obsolete starting w/ mk3 and values re-used for other stuff
+        if version.has_608:
+            return False
+        return self.delay_achieved < self.delay_required
+
     def is_blank(self):
         # device has no PIN at this point
         return bool(self.state_flags & PA_IS_BLANK)

shared/selftest.py

@@ -34,9 +34,13 @@ def set_genuine():
     # - or logged in already as main
     from pincodes import pa
 
+    if pa.is_secondary:
+        return
+
     if not pa.is_successful():
         # assume blank pin during factory selftest
         pa.setup(b'')
+        assert not pa.is_delay_needed()     # "PIN failures?"
 
         if not pa.is_successful():
             pa.login()