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tpm, tpm_tis: Decorate tpm_get_timeouts() with request_locality()

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This is shown with Samsung Chromebook Pro (Caroline) with TPM 1.2
(SLB 9670):

[    4.324298] TPM returned invalid status
[    4.324806] WARNING: CPU: 2 PID: 1 at drivers/char/tpm/tpm_tis_core.c:275 tpm_tis_status+0x86/0x8f

Background
==========

TCG PC Client Platform TPM Profile (PTP) Specification, paragraph 6.1 FIFO
Interface Locality Usage per Register, Table 39 Register Behavior Based on
Locality Setting for FIFO - a read attempt to TPM_STS_x Registers returns
0xFF in case of lack of locality.

The fix
=======

Decorate tpm_get_timeouts() with request_locality() and release_locality().

Fixes: a3fbfae82b ("tpm: take TPM chip power gating out of tpm_transmit()")
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Laurent Bigonville <bigon@debian.org>
Cc: stable@vger.kernel.org
Reported-by: Lukasz Majczak <lma@semihalf.com>
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
This commit is contained in:
Jarkko Sakkinen 2021-02-20 00:55:59 +02:00
parent c03c21ba6f
commit a5665ec2af
1 changed files with 12 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
drivers/char/tpm/tpm_tis_core.c
View File

@ -1019,11 +1019,21 @@ int tpm_tis_core_init(struct device *dev, struct tpm_tis_data *priv, int irq,
init_waitqueue_head(&priv->read_queue);
init_waitqueue_head(&priv->int_queue);
if (irq != -1) {
/* Before doing irq testing issue a command to the TPM in polling mode
/*
* Before doing irq testing issue a command to the TPM in polling mode
* to make sure it works. May as well use that command to set the
* proper timeouts for the driver.
*/
if (tpm_get_timeouts(chip)) {
rc = request_locality(chip, 0);
if (rc < 0)
goto out_err;
rc = tpm_get_timeouts(chip);
release_locality(chip, 0);
if (rc) {
dev_err(dev, "Could not get TPM timeouts and durations\n");
rc = -ENODEV;
goto out_err;