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Duncan Laurie 32d33b29ba TPM: Retry SaveState command in suspend path ... If the TPM has already been sent a SaveState command before the driver is loaded it may have problems sending that same command again later. This issue is seen with the Chromebook Pixel due to a firmware bug in the legacy mode boot path which is sending the SaveState command before booting the kernel. More information is available at http://crbug.com/203524 This change introduces a retry of the SaveState command in the suspend path in order to work around this issue. A future firmware update should fix this but this is also a trivial workaround in the driver that has no effect on systems that do not show this problem. When this does happen the TPM responds with a non-fatal TPM_RETRY code that is defined in the specification: The TPM is too busy to respond to the command immediately, but the command could be resubmitted at a later time. The TPM MAY return TPM_RETRY for any command at any time. It can take several seconds before the TPM will respond again. I measured a typical time between 3 and 4 seconds and the timeout is set at a safe 5 seconds. It is also possible to reproduce this with commands via /dev/tpm0. The bug linked above has a python script attached which can be used to test for this problem. I tested a variety of TPMs from Infineon, Nuvoton, Atmel, and STMicro but was only able to reproduce this with LPC and I2C TPMs from Infineon. The TPM specification only loosely defines this behavior: TPM Main Level 2 Part 3 v1.2 r116, section 3.3. TPM_SaveState: The TPM MAY declare all preserved values invalid in response to any command other than TPM_Init. TCG PC Client BIOS Spec 1.21 section 8.3.1. After issuing a TPM_SaveState command, the OS SHOULD NOT issue TPM commands before transitioning to S3 without issuing another TPM_SaveState command. TCG PC Client TIS 1.21, section 4. Power Management: The TPM_SaveState command allows a Static OS to indicate to the TPM that the platform may enter a low power state where the TPM will be required to enter into the D3 power state. The use of the term "may" is significant in that there is no requirement for the platform to actually enter the low power state after sending the TPM_SaveState command. The software may, in fact, send subsequent commands after sending the TPM_SaveState command. Change-Id: I52b41e826412688e5b6c8ddd3bb16409939704e9 Signed-off-by: Duncan Laurie <dlaurie@chromium.org> Signed-off-by: Kent Yoder <key@linux.vnet.ibm.com>		12 years ago
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Kconfig	tpm/ibmvtpm: build only when IBM pseries is configured	12 years ago
Makefile	TPM: STMicroelectronics ST33 I2C BUILD STUFF	12 years ago
tpm.c	TPM: Retry SaveState command in suspend path	12 years ago
tpm.h	TPM: Retry SaveState command in suspend path	12 years ago
tpm_acpi.c	TPM: Switch to __packed instead of __attribute__((packed))	12 years ago
tpm_atmel.c	tpm: Fix cancellation of TPM commands (polling mode)	12 years ago
tpm_atmel.h	…
tpm_eventlog.c	…
tpm_eventlog.h	…
tpm_i2c_infineon.c	tpm/tpm_i2c_infineon: Add small comment about return value of __i2c_transfer	12 years ago
tpm_i2c_stm_st33.c	tpm_i2c_stm_st33: Remove duplicate inclusion of header files	12 years ago
tpm_i2c_stm_st33.h	tpm_i2c_stm_st33: fix oops when i2c client is unavailable	12 years ago
tpm_ibmvtpm.c	tpm: Fix cancellation of TPM commands (polling mode)	12 years ago
tpm_ibmvtpm.h	drivers/char/tpm: remove tasklet and cleanup	12 years ago
tpm_infineon.c	Char/Misc driver merge for 3.8-rc1	12 years ago
tpm_nsc.c	tpm: Fix cancellation of TPM commands (polling mode)	12 years ago
tpm_of.c	…
tpm_ppi.c	drivers/char/tpm/tpm_ppi: use strlcpy instead of strncpy	12 years ago
tpm_tis.c	tpm_tis: check pnp_acpi_device return code	12 years ago