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>

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},