Te overall platform ability to enter a low power state is also conditioned on the ability of a tpm device to go to idle state. This series should provide this feature.
Unfortunately, there is a HW bug on Intel PTT devices on Skylake, Kabylake, and Broxton devices, where certain registers lost retention during TPM idle state. Hence this implementation takes this into consideration and implement the feature based only on access to registers that retain their state. This still conforms to the spec and should be correct also on non Intle devices. V2: Utilize runtime_pm for driving tpm crb idle states. V3. fix lower case corruption in the first patch V4. Fix unbalanced runtime pm get and put Tomas Winkler (4): tpm/tpm_crb: implement tpm crb idle state tmp/tpm_crb: fix Intel PTT hw bug during idle state tpm/tpm_crb: open code the crb_init into acpi_add tmp/tpm_crb: implement runtime pm for tpm_crb drivers/char/tpm/tpm-interface.c | 5 ++ drivers/char/tpm/tpm_crb.c | 166 +++++++++++++++++++++++++++++++++------ 2 files changed, 147 insertions(+), 24 deletions(-) -- 2.7.4
