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path: root/drivers/platform/chrome/cros_ec_proto.c
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Diffstat (limited to 'drivers/platform/chrome/cros_ec_proto.c')
-rw-r--r--drivers/platform/chrome/cros_ec_proto.c32
1 files changed, 32 insertions, 0 deletions
diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c
index 05d2e8765a66..475a6dd72db6 100644
--- a/drivers/platform/chrome/cros_ec_proto.c
+++ b/drivers/platform/chrome/cros_ec_proto.c
@@ -773,6 +773,7 @@ int cros_ec_get_next_event(struct cros_ec_device *ec_dev,
u8 event_type;
u32 host_event;
int ret;
+ u32 ver_mask;
/*
* Default value for wake_event.
@@ -794,6 +795,37 @@ int cros_ec_get_next_event(struct cros_ec_device *ec_dev,
return get_keyboard_state_event(ec_dev);
ret = get_next_event(ec_dev);
+ /*
+ * -ENOPROTOOPT is returned when EC returns EC_RES_INVALID_VERSION.
+ * This can occur when EC based device (e.g. Fingerprint MCU) jumps to
+ * the RO image which doesn't support newer version of the command. In
+ * this case we will attempt to update maximum supported version of the
+ * EC_CMD_GET_NEXT_EVENT.
+ */
+ if (ret == -ENOPROTOOPT) {
+ dev_dbg(ec_dev->dev,
+ "GET_NEXT_EVENT returned invalid version error.\n");
+ ret = cros_ec_get_host_command_version_mask(ec_dev,
+ EC_CMD_GET_NEXT_EVENT,
+ &ver_mask);
+ if (ret < 0 || ver_mask == 0)
+ /*
+ * Do not change the MKBP supported version if we can't
+ * obtain supported version correctly. Please note that
+ * calling EC_CMD_GET_NEXT_EVENT returned
+ * EC_RES_INVALID_VERSION which means that the command
+ * is present.
+ */
+ return -ENOPROTOOPT;
+
+ ec_dev->mkbp_event_supported = fls(ver_mask);
+ dev_dbg(ec_dev->dev, "MKBP support version changed to %u\n",
+ ec_dev->mkbp_event_supported - 1);
+
+ /* Try to get next event with new MKBP support version set. */
+ ret = get_next_event(ec_dev);
+ }
+
if (ret <= 0)
return ret;