reg_access: Forcewake as necessary

Don't try to be smart. Just poke all forcewake bits if it seems we need
it.

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>

tools/quick_dump/reg_access.py

@@ -9,12 +9,35 @@ def read(reg):
 def write(reg, val):
 	chipset.intel_register_write(reg, val)
 
+def gen6_forcewake_get():
+	write(0xa18c, 0x1)
+	read("0xa180")
+
+def mt_forcewake_get():
+	write(0xa188, 0x10001)
+	read("0xa180")
+
+def vlv_forcewake_get():
+	write(0x1300b0, 0x10001)
+	read("0x1300b4")
+
+# don't be clever, just try all possibilities
+def get_wake():
+	gen6_forcewake_get()
+	mt_forcewake_get()
+	vlv_forcewake_get()
+
 def init():
 	pci_dev = chipset.intel_get_pci_device()
 	ret = chipset.intel_register_access_init(pci_dev, 0)
 	if ret != 0:
 		print("Register access init failed");
 		return False
+
+	if chipset.intel_register_access_needs_wake():
+		print("Forcing forcewake. Don't expect your system to work after this.")
+		get_wake()
+
 	return True
 
 if __name__ == "__main__":