From: Stefan Berger <stefanb@linux.vnet.ibm.com>
Date: Fri, 11 Nov 2011 17:57:06 +0000 (-0500)
Subject: tpm_tis: add delay after aborting command
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=a927b8131794ee449b7f6666e7ab61301949b20f;p=deliverable%2Flinux.git

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 34832bc74649..d93bafde3120 100644
--- 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;