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| author | Winkler, Tomas <tomas.winkler@intel.com> | 2016-09-12 16:04:21 +0300 |
|---|---|---|
| committer | Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> | 2016-09-16 15:51:22 +0300 |
| commit | e350e24694e447e6ab7312fffae5ca31a0bb5165 (patch) | |
| tree | ba78019ba70a254509f9398c482ccd6a9a57a7db /drivers/char/tpm/tpm_crb.c | |
| parent | 0c22db435bf79d3cf3089df7ff198d4867df3c27 (diff) | |
| download | linux-e350e24694e447e6ab7312fffae5ca31a0bb5165.tar.xz | |
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 enabled, the device will be in
ready state.
[jarkko.sakkinen@linux.intel.com: changed pm_runtime_put_sync()
to pm_runtime_put()]
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>
Diffstat (limited to 'drivers/char/tpm/tpm_crb.c')
| -rw-r--r-- | drivers/char/tpm/tpm_crb.c | 37 |
1 files changed, 34 insertions, 3 deletions
diff --git a/drivers/char/tpm/tpm_crb.c b/drivers/char/tpm/tpm_crb.c index d385e63008a6..aa0ef742ac03 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" @@ -152,8 +153,6 @@ 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); @@ -436,9 +435,16 @@ static int crb_acpi_add(struct acpi_device *device) if (rc) return rc; + 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_disable(dev); + } + + pm_runtime_put(dev); return rc; } @@ -450,9 +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}, |