diff options
| author | Winkler, Tomas <tomas.winkler@intel.com> | 2016-10-08 14:59:39 +0300 |
|---|---|---|
| committer | Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> | 2016-11-28 01:31:30 +0200 |
| commit | e74f2f76c13770bb8e004475a933923e9c92723d (patch) | |
| tree | c011ae10c69e72a23f77e05342a0ff43f560c023 /drivers/char | |
| parent | c58bd34cec4c05f8e3362a79ae94de9f405c39b5 (diff) | |
tmp/tpm_crb: implement runtime pm for tpm_crb
Utilize runtime_pm for driving tpm crb idle states.
The framework calls cmd_ready from the pm_runtime_resume handler
and go idle from the pm_runtime_suspend handler.
The TPM framework should wake the device before transmit and receive.
In case the runtime_pm framework is not compiled in or enabled, the device
will be in the permanent ready state.
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Tested-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Diffstat (limited to 'drivers/char')
| -rw-r--r-- | drivers/char/tpm/tpm-interface.c | 5 | ||||
| -rw-r--r-- | drivers/char/tpm/tpm_crb.c | 42 |
2 files changed, 43 insertions, 4 deletions
diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c index 3a9149cf0110..cb0e57ee053d 100644 --- a/drivers/char/tpm/tpm-interface.c +++ b/drivers/char/tpm/tpm-interface.c @@ -29,6 +29,7 @@ #include <linux/mutex.h> #include <linux/spinlock.h> #include <linux/freezer.h> +#include <linux/pm_runtime.h> #include "tpm.h" #include "tpm_eventlog.h" @@ -356,6 +357,8 @@ ssize_t tpm_transmit(struct tpm_chip *chip, const u8 *buf, size_t bufsiz, if (!(flags & TPM_TRANSMIT_UNLOCKED)) mutex_lock(&chip->tpm_mutex); + pm_runtime_get_sync(chip->dev.parent); + rc = chip->ops->send(chip, (u8 *) buf, count); if (rc < 0) { dev_err(&chip->dev, @@ -397,6 +400,8 @@ out_recv: dev_err(&chip->dev, "tpm_transmit: tpm_recv: error %zd\n", rc); out: + pm_runtime_put_sync(chip->dev.parent); + if (!(flags & TPM_TRANSMIT_UNLOCKED)) mutex_unlock(&chip->tpm_mutex); return rc; diff --git a/drivers/char/tpm/tpm_crb.c b/drivers/char/tpm/tpm_crb.c index f579f1ac4688..717b6b47c042 100644 --- a/drivers/char/tpm/tpm_crb.c +++ b/drivers/char/tpm/tpm_crb.c @@ -19,6 +19,7 @@ #include <linux/highmem.h> #include <linux/rculist.h> #include <linux/module.h> +#include <linux/pm_runtime.h> #include "tpm.h" #define ACPI_SIG_TPM2 "TPM2" @@ -149,8 +150,6 @@ static int __maybe_unused crb_cmd_ready(struct device *dev, return 0; } -static SIMPLE_DEV_PM_OPS(crb_pm, tpm_pm_suspend, tpm_pm_resume); - static u8 crb_status(struct tpm_chip *chip) { struct crb_priv *priv = dev_get_drvdata(&chip->dev); @@ -433,11 +432,21 @@ static int crb_acpi_add(struct acpi_device *device) if (rc) return rc; + pm_runtime_get_noresume(dev); + pm_runtime_set_active(dev); + pm_runtime_enable(dev); + rc = tpm_chip_register(chip); - if (rc) + if (rc) { crb_go_idle(dev, priv); + pm_runtime_put_noidle(dev); + pm_runtime_disable(dev); + return rc; + } - return rc; + pm_runtime_put(dev); + + return 0; } static int crb_acpi_remove(struct acpi_device *device) @@ -447,9 +456,34 @@ static int crb_acpi_remove(struct acpi_device *device) tpm_chip_unregister(chip); + pm_runtime_disable(dev); + return 0; } +#ifdef CONFIG_PM +static int crb_pm_runtime_suspend(struct device *dev) +{ + struct tpm_chip *chip = dev_get_drvdata(dev); + struct crb_priv *priv = dev_get_drvdata(&chip->dev); + + return crb_go_idle(dev, priv); +} + +static int crb_pm_runtime_resume(struct device *dev) +{ + struct tpm_chip *chip = dev_get_drvdata(dev); + struct crb_priv *priv = dev_get_drvdata(&chip->dev); + + return crb_cmd_ready(dev, priv); +} +#endif /* CONFIG_PM */ + +static const struct dev_pm_ops crb_pm = { + SET_SYSTEM_SLEEP_PM_OPS(tpm_pm_suspend, tpm_pm_resume) + SET_RUNTIME_PM_OPS(crb_pm_runtime_suspend, crb_pm_runtime_resume, NULL) +}; + static struct acpi_device_id crb_device_ids[] = { {"MSFT0101", 0}, {"", 0}, |