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SubjectRe: [PATCH] tpm: turn on TPM on suspend for TPM 1.x
On Fri, Mar 22, 2019 at 12:51:20PM +0200, Jarkko Sakkinen wrote:
> tpm_chip_start/stop() should be also called for TPM 1.x devices on
> suspend. Add that functionality back. Do not lock the chip because
> it is unnecessary as there are no multiple threads using it when
> doing the suspend.
>
> Fixes: a3fbfae82b4c ("tpm: take TPM chip power gating out of tpm_transmit()")
> Reported-by: Paul Zimmerman <pauldzim@gmail.com>
> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
> ---
> drivers/char/tpm/tpm-interface.c | 14 ++++++--------
> 1 file changed, 6 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
> index 83ece5639f86..ae1030c9b086 100644
> --- a/drivers/char/tpm/tpm-interface.c
> +++ b/drivers/char/tpm/tpm-interface.c
> @@ -402,15 +402,13 @@ int tpm_pm_suspend(struct device *dev)
> if (chip->flags & TPM_CHIP_FLAG_ALWAYS_POWERED)
> return 0;
>
> - if (chip->flags & TPM_CHIP_FLAG_TPM2) {
> - mutex_lock(&chip->tpm_mutex);
> - if (!tpm_chip_start(chip)) {
> + if (!tpm_chip_start(chip)) {
> + if (chip->flags & TPM_CHIP_FLAG_TPM2)
> tpm2_shutdown(chip, TPM2_SU_STATE);
> - tpm_chip_stop(chip);
> - }
> - mutex_unlock(&chip->tpm_mutex);
> - } else {
> - rc = tpm1_pm_suspend(chip, tpm_suspend_pcr);
> + else
> + rc = tpm1_pm_suspend(chip, tpm_suspend_pcr);
> +
> + tpm_chip_stop(chip);
> }
>
> return rc;

Tested-by: Domenico Andreoli <domenico.andreoli@linux.com>

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