tpm_tis: add delay after aborting command

This patch adds a delay after aborting a command. Some TPMs need
this and will not process the subsequent command correctly otherwise.

Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>

diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c
index 34832bc..d93bafd 100644 (file)
--- a/drivers/char/tpm/tpm_tis.c
+++ b/drivers/char/tpm/tpm_tis.c
@@ -432,6 +432,9 @@ static int probe_itpm(struct tpm_chip *chip)
 out:
        itpm = rem_itpm;
        tpm_tis_ready(chip);
+       /* some TPMs need a break here otherwise they will not work
+        * correctly on the immediately subsequent command */
+       msleep(chip->vendor.timeout_b);
        release_locality(chip, chip->vendor.locality, 0);
 
        return rc;