linux-kernel - [PATCH] tpm_tis: override reported C and D timeouts for Atmel 3203

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Date:   Thu, 12 Jan 2017 19:08:53 +0100
From:   "Maciej S. Szmigiero" <mail@...iej.szmigiero.name>
To:     tpmdd-devel@...ts.sourceforge.net
Cc:     linux-kernel <linux-kernel@...r.kernel.org>,
        Peter Huewe <peterhuewe@....de>,
        Marcel Selhorst <tpmdd@...horst.net>,
        Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        Christophe Ricard <christophe.ricard@...il.com>,
        Jason Gunthorpe <jgunthorpe@...idianresearch.com>
Subject: [PATCH] tpm_tis: override reported C and D timeouts for Atmel 3203

Since commit 1107d065fdf1 ("tpm_tis: Introduce intermediate layer for TPM
access") Atmel 3203 TPM on ThinkPad X61S (TPM firmware version 13.9) no
longer works.
It turns out the initialization proceeds fine until we get and start using
chip-reported timeouts - and the chip reports C and D timeouts of zero.

Since these are clearly not long enough let's add an override for them
to TPM TIS default values, just as we do for Atmel 3204.
A and B timeouts are set to the same values as the chip normally reports.

Signed-off-by: Maciej S. Szmigiero <mail@...iej.szmigiero.name>

Fixes: 1107d065fdf1 ("tpm_tis: Introduce intermediate layer for TPM access")
Cc: stable@...r.kernel.org
---
 drivers/char/tpm/tpm_tis_core.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c
index 7993678954a2..e42e5a6a3c2f 100644
--- a/drivers/char/tpm/tpm_tis_core.c
+++ b/drivers/char/tpm/tpm_tis_core.c
@@ -421,6 +421,9 @@ struct tis_vendor_timeout_override {
 };

 static const struct tis_vendor_timeout_override vendor_timeout_overrides[] = {
+	/* Atmel 3203 */
+	{ 0x32031114, { (10*1000), (10*1000),
+			(TIS_SHORT_TIMEOUT*1000), (TIS_SHORT_TIMEOUT*1000) } },
 	/* Atmel 3204 */
 	{ 0x32041114, { (TIS_SHORT_TIMEOUT*1000), (TIS_LONG_TIMEOUT*1000),
 			(TIS_SHORT_TIMEOUT*1000), (TIS_SHORT_TIMEOUT*1000) } },