git/linux-cryptodev-2.6
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/herbert/cryptodev-2.6.git synced 2026-04-23 05:56:14 -04:00
Code Issues Packages Projects Releases Wiki Activity

platform/chrome: cros_ec: jump to RW before probing

Browse Source 
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>
This commit is contained in:
Dawid Niedzwiecki
2024-12-06 09:15:13 +00:00
committed by Tzung-Bi Shih
parent cfa842c80c
commit 5ffa0dbfdc
9 changed files with 74 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
include/linux/platform_data/cros_ec_proto.h
View File

@@ -246,6 +246,8 @@ int cros_ec_cmd_xfer(struct cros_ec_device *ec_dev,
int cros_ec_cmd_xfer_status(struct cros_ec_device *ec_dev,
struct cros_ec_command *msg);
int cros_ec_rwsig_continue(struct cros_ec_device *ec_dev);
int cros_ec_query_all(struct cros_ec_device *ec_dev);
int cros_ec_get_next_event(struct cros_ec_device *ec_dev,