From 4e401fb028b79105ed87d85fc2220c77be277ed9 Mon Sep 17 00:00:00 2001 From: Stefan Berger Date: Fri, 20 Jan 2012 12:58:49 -0500 Subject: [PATCH] tpm_tis: Only probe iTPMs Detect iTPMs through the vendor ID on the hardware interface and only probe the device if the manufacturer is found to be Intel. This obsoletes a previously added delay necessary for some TPMs but not iTPMs. Signed-off-by: Stefan Berger Signed-off-by: Rajiv Andrade --- drivers/char/tpm/tpm.h | 2 ++ drivers/char/tpm/tpm_tis.c | 8 +++++--- 2 files changed, 7 insertions(+), 3 deletions(-) diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h index 010547138281..b1c5280ac159 100644 --- a/drivers/char/tpm/tpm.h +++ b/drivers/char/tpm/tpm.h @@ -99,6 +99,8 @@ struct tpm_vendor_specific { wait_queue_head_t int_queue; }; +#define TPM_VID_INTEL 0x8086 + struct tpm_chip { struct device *dev; /* Device stuff */ diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c index a1748621111b..47ba9c213cc1 100644 --- a/drivers/char/tpm/tpm_tis.c +++ b/drivers/char/tpm/tpm_tis.c @@ -368,6 +368,11 @@ static int probe_itpm(struct tpm_chip *chip) }; size_t len = sizeof(cmd_getticks); int rem_itpm = itpm; + u16 vendor = ioread16(chip->vendor.iobase + TPM_DID_VID(0)); + + /* probe only iTPMS */ + if (vendor != TPM_VID_INTEL) + return 0; itpm = 0; @@ -390,9 +395,6 @@ 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; -- 2.20.1