UPSTREAM: platform/chrome: cros_ec: jump to RW before probing

There are EC devices, like FPMCU, that use RWSIG as a method of
authenticating RW section. After the authentication succeeds, EC device
waits some time before jumping to RW. EC can be probed before the jump,
which means there is a time window after jump to RW in which EC won't
respond, because it is not initialized. It can cause a communication
errors after probing.

To avoid such problems, send the RWSIG continue command first, which
skips waiting for the jump to RW. Send the command more times, to make
sure EC is ready in RW before the start of the actual probing process. If
a EC device doesn't support the RWSIG, it will respond with invalid
command error code and probing will continue as usual.

Signed-off-by: Dawid Niedzwiecki <dawidn@google.com>
Link: https://lore.kernel.org/r/20241206091514.2538350-2-dawidn@google.com


Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>
(cherry picked from commit 5ffa0dbf)

BUG=b:373543912
TEST=Make sure FPMCU is always registers for Omniknight devices.

Change-Id: I6dd5178f24169cc2f045ecfa6b13a1d8a5f2ea73
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/6218201


Reviewed-by: Sean Paul <sean@poorly.run>
Reviewed-by: Kornel Dulęba <korneld@google.com>
Reviewed-by: Patryk Duda <patrykd@google.com>
Tested-by: Dawid Niedźwiecki <dawidn@google.com>
Commit-Queue: Dawid Niedźwiecki <dawidn@google.com>
Signed-off-by: Hubert Mazur <hmazur@google.com>