tici: speedup power save setting (#29100)

* speedup

* update type

---------

Co-authored-by: Comma Device <device@comma.ai>
old-commit-hash: d92c9aef23fc789d50bfd03ae09a3abbf23a8429

common/gpio.py

@@ -1,4 +1,4 @@
-import glob
+from functools import cache
 from typing import Optional, List
 
 def gpio_init(pin: int, output: bool) -> None:
@@ -25,12 +25,20 @@ def gpio_read(pin: int) -> Optional[bool]:
 
   return val
 
-def get_irq_for_action(action: str) -> List[int]:
-  ret = []
-  for fn in glob.glob('/sys/kernel/irq/*/actions'):
-    with open(fn) as f:
+@cache
+def get_irq_action(irq: int) -> List[str]:
+  try:
+    with open(f"/sys/kernel/irq/{irq}/actions") as f:
       actions = f.read().strip().split(',')
-      if action in actions:
-        irq = int(fn.split('/')[-2])
+      return actions
+  except FileNotFoundError:
+    return []
+
+def get_irqs_for_action(action: str) -> List[str]:
+  ret = []
+  with open("/proc/interrupts") as f:
+    for l in f.readlines():
+      irq = l.split(':')[0].strip()
+      if irq.isdigit() and action in get_irq_action(irq):
         ret.append(irq)
   return ret