From: Chris Chiu chiu@endlessm.com

commit 0803d7befa15cab5717d667a97a66214d2a4c083 upstream

The Acer Acer Veriton X4110G has a TPM device detected as: tpm_tis 00:0b: 1.2 TPM (device-id 0xFE, rev-id 71)

After the first S3 suspend, the following error appears during resume: tpm tpm0: A TPM error(38) occurred continue selftest

Any following S3 suspend attempts will now fail with this error: tpm tpm0: Error (38) sending savestate before suspend PM: Device 00:0b failed to suspend: error 38

Error 38 is TPM_ERR_INVALID_POSTINIT which means the TPM is not in the correct state. This indicates that the platform BIOS is not sending the usual TPM_Startup command during S3 resume.

From this point onwards, all TPM commands will fail.

The same issue was previously reported on Foxconn 6150BK8MC and Sony Vaio TX3.

The platform behaviour seems broken here, but we should not break suspend/resume because of this.

When the unexpected TPM state is encountered, set a flag to skip the affected TPM_SaveState command on later suspends.

Cc: stable@vger.kernel.org Signed-off-by: Chris Chiu chiu@endlessm.com Signed-off-by: Daniel Drake drake@endlessm.com Link: http://lkml.kernel.org/r/CAB4CAwfSCvj1cudi+MWaB5g2Z67d9DwY1o475YOZD64ma23UiQ... Link: https://lkml.org/lkml/2011/3/28/192 Link: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=591031 Reviewed-by: Jarkko Sakkinen jarkko.sakkinen@linux.intel.com Signed-off-by: Jarkko Sakkinen jarkko.sakkinen@linux.intel.com --- drivers/char/tpm/tpm-interface.c | 4 ++++ 1 file changed, 4 insertions(+)

diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c index 247dd2b6504a..be0547115d34 100644 --- a/drivers/char/tpm/tpm-interface.c +++ b/drivers/char/tpm/tpm-interface.c @@ -787,6 +787,10 @@ int tpm_do_selftest(struct tpm_chip *chip) loops = jiffies_to_msecs(duration) / delay_msec;

rc = tpm_continue_selftest(chip); + if (rc == TPM_ERR_INVALID_POSTINIT) { + chip->flags |= TPM_CHIP_FLAG_ALWAYS_POWERED; + dev_info(&chip->dev, "TPM not ready (%d)\n", rc); + } /* This may fail if there was no TPM driver during a suspend/resume * cycle; some may return 10 (BAD_ORDINAL), others 28 (FAILEDSELFTEST) */