Bug#649033: [PATCH] tpm_tis: add delay after aborting command
(+cc: Andrea, Uwe)
Stefan Berger wrote:
> Can someone who experiences the delay during the boot please apply the
> patch below? Please let me know whether it solves the problem.
Uwe, Andrea, instructions for building a patched kernel are at [1].
[1] http://kernel-handbook.alioth.debian.org/ch-common-tasks.html
commit a927b8131794
Author: Stefan Berger <stefanb@linux.vnet.ibm.com>
Date: Fri Nov 11 12:57:06 2011 -0500
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;
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